MITANI VALVE CO.,LTD

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FAQ

General questions (general issues, company profile, and others) On valves On accessories On pumps

General questions (general issues, company profile, and others)
Q What is the main business of Mitani?
A We provide two types of products:
1) Aerosol valves for the purpose of discharging the contents of aerosol cans (for hair sprays and insecticide sprays, for example) and valve accessories (usually called "actuators") such as valve actuators and caps:
2) Dispenser pumps (for shampoo) and trigger pumps (for house cleaning detergents) for the purpose of discharging the contents by pulling a lever.
Mitani is a specialty, leading-edge company in R&D, manufacturing and sales of these products. We help our customers from the planning stage to the mass-production stage by offering original products, carrying out various tests to find the product best suitable for customer's needs, and designing original products.

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Q We already have an aerosol form product. Can you fill it into aerosol cans for us?
A Mitani has a filling equipment for in-house evaluation. If you would like to fill your prototype product into an aerosol can for testing purposes, we can do it upon request. If a filling process is required for the purpose of mass-production, we will introduce a filling company.

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Q Please explain the lineup of Mitani's products.
A We provide two types of products.
1) Aerosol valves for the purpose of discharging the contents of aerosol cans (for hair sprays and insecticide sprays, for example) and valve accessories (usually called "actuators") such as valve actuators and caps.
2) Dispenser pumps (for shampoo and conditioner) and trigger pumps (for house cleaning detergents) for the purpose of discharging the contents by pulling a lever.
We offer various products to meet customer's individual needs. Please contact us through our website for copies of our product brochure.

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Q Please let us know your sales records and customers.
A The long history of our good sales record attributes to kind assistance and support from our customers. In Japan, Mitani has a 50% share in the valve market and a 20% share in the pump market.

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Q Please let us know the delivery time of Mitani products.
A Our delivery time of standard products is basically 1 month. Depending on the type of products, we make efforts to deliver valves in 2 weeks and pumps and accessories in 1 month. If your product requires a newly-developed valve or pump, please consult our sales representatives.

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Q We would like to have the same product which is produced by a company other than Mitani.
A Please let us know the exact product you would like to use. We will check the specifications and let you know whether we can provide a product with the same specifications as soon as possible. If possible, we will give you a sample.
We are ready to develop a product meeting your own needs. However, we may not be able to provide the same product due to the patent and design infringement problems. Please contact our sales representatives. We will inform you whether we can provide the product you want or not.

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Q Can you tell us whether a valve/pump that Company A uses for its Product B is a Mitani's product or not?
A If you already know that Product B of Company A is definitely a Mitani's product, we can give you an answer immediately. If you are not sure whether a Mitani's product is used in Product B, we will check and inform you. If Product B was jointly developed with Company A for a special purpose, we can quickly give you an answer. However, if Product B is one of our standard products, it may take some time to respond to your inquiry.
Should we find out that Product B is not by Mitani, we will inform you whether we can provide a similar product or not as soon as possible.

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Q Can you provide us with the same Mitani product that Company A uses for its Product C?
A We have standard products which can be sold to any customers, and special products which are jointly developed with a customer for specific use under an agreement (exclusive products). If Product C is one of our standard products, we can provide you with it any time you want. If Product C is an exclusive product for Company A, however, we cannot provide the same product. In this case, we can change , for example, the design or a function of an exclusive product and provide it to you for your own products. Please consult our sales representatives. We will suggest a solution.

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Q We would like to have a sample of Mitani's product. How long does it take to receive the sample?
A Please ask our sales representatives what product sample you would like to have. We will provide it in 3 to 5 days. If you need many samples, please consult us. In order to provide the best sample for your product and purpose, our sales representatives will contact and ask you detailed questions.

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Q Can you decrease/increase the function(spray)load?
A Factors affecting and determining the spray load of aerosol cans include the strength of the spring (spring load), hardness of the stem rubber, and inner pressure of the aerosol can. As it is difficult to change the hardness of the stem rubber and the inner pressure, the spray load is changed by adjusting the spring load. We have various springs with different loads for our standard valves. However, the spring load cannot be changed in some products depending on the type of valves or products. We also have trigger type products with a hinge which has a smaller spray load. Factors affecting the spray load of pump products include the spring load, viscosity and sliding resistance of the content, the internal diameter of the cylinder, and the flow resistance of the jet nozzle (internal diameter). We may change the above factors and prepare a product your consumers prefer. Please consult our sales representatives. We will offer you the most appropriate specifications for your product.
The change of the function load automatically leads to a change of the spray load for pump products. Although it is basically possible, there are limitations due to the viscosity of the contents. As it depends on the purpose of use of our product, please consult our sales representatives. We will offer you the most appropriate specifications for your product.

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Q Although we would like to test Mitani's product, we do not know the product name and specifications.
A You can find the product name by Visiting our web site and checking the "Products" page where a product list is available. Please let us know if you have already found an already-marketed product that can be used as a reference to your planned product. If you know a product that can be used as a reference but is used for the purpose different from yours, we will check it and offer you the most appropriate specifications. Please contact us and receive Mitani's product brochure. Our sales representatives are ready to visit you to explain our products any time.

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Q What is a capillary dip tube? What advantages can we enjoy by using it?
A A capillary dip tube is a pipe with a small internal diameter which has a higher flow resistance and smaller unobstructed capacity than the standard pipes. These characteristics of capillary dip tubes can be taken advantage of by using them for the following purposes:
1) When decreasing the spray amount, we usually narrow a lower hole in a housing. However if the valve/pump is easily clogged with the contents because they include powder (solid fine powder), we have to maintain a certain internal diameter for the pipe. In such a case, using a capillary pipe causes a higher flow resistance so that we can decrease the spray amount without narrowing the lower hole of the housing.
2) For foam-type products such as hair mousse, it is usually necessary to shake the can before application to mix the contents and the propellant. However the contents in the pipe may be mixed insufficiently and discharged in a non-foaming form. The capillary dip tube minimizes such phenomenon.
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Q Please let us know your recommended clinching specifications for TSW (Mitani's product which uses a resin gasket.)
A TSW has some limitations for its use depending on the manufacturing process of an aerosol product and how it is fixed in a can. We recommend 27.15 mm +/- 0.05 of clinch width, 4.75 +/- 0.05 mm of clinch depth, and an 8-collet type.
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Q Can we use Mitani's products for phamaceutical products?
A Many of our products have already been adopted for phamaceutical products. For drugs with limited dose amount, a metering valve (also called as "metering spray") is the best choice. We can offer appropriate specifications based on our experiences. Please complete required tests and evaluation process on your own in accordance with rules and standards set under the Pharmaceutical Affairs Law.

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Q What is the difference between liquified gas and vaporized gas?
A In aerosol products, a propellant is used to dissolve and discharge the contents, and certain types of propellants are liquified by compression. Such liquified propellants are called as liquified gas. Therefore, the contents in a can are under pressure due to the pressure of this propellant. In a can, gas is divided into two phases; the liquid phase which consists of evenly dissolved contents and liquified gas; and the vapor phase which consists of vaporized propellant. What exists in the vapor phase in the form of gas is called vaporized gas.

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Q What is the difference between liquified gas and compressed gas?
A Aerosol products can be classified into two categories depending on the physical characteristics of gas used as the propellant.
In liquefied gas type products, compressed and liquefied gas is used as the propellant, and in compressed gas type products, compressed and high pressure gas is used as the propellant. Liquefied gas includes LPG and DME, and compressed gas includes nitrogen gas and carbon dioxide.
As carbon dioxide has the characteristic to dissolve in liquid contents, using carbon dioxide gas as a propellant shows a characteristic similar to that of liquefied gas.

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Q Various materials are probably used for many parts of your products. Can we sort the parts by type of materials before disposal?
A Presently, we can provide valve accessories (the nozzle part attached to the valve, usually called actuators) which can be detached and sorted before disposal. It is possible to select various parts made of different materials which best fit your product and its purpose according to your request. Please consult our sales representatives.

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On valves
Q Can you provide us with the same Mitani valve that Company A uses for its Product C?
A We have standard products which can be sold to any customers, and special products which are jointly developed with a customer for specific use under an agreement (exclusive or patented products). If Product C marketed by Company A uses one of our standard products, we can provide you with the product any time. If Product C is an exclusive/patented product for Company A, however, we cannot give you the service.
In this case, we can change, for example, the design or a function of an exclusive/patented product and provide it to you for your own products. Please consult our sales representatives. They will suggest a solution.

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Q Please explain the difference between standard valves, semi-tilt valves, and tilt valves.
A Standard valves are general valves, also called push-down valves. When a stem is pushed down (i.e. a actuator is pushed), an orifice located in the stem moves down to a part sealed by a stem rubber, and the contents are discharged. Tilt valves are designed to discharge the contents by a tilt action of the actuator which means that the stem is tilted to move the actuator horizontally. A sealed side of the stem rubber is shaped like a mortar to discharge the contents even if the can is tilted on a side where an orifice is not located. One of the features of the tilt valve is to open/close the valve with a smaller action. Semi-tilt valves are categorized as push-down valves. A sealed side of the stem is shaped like a mortar similar to that of the tilt valve which means that the transition zone between full open and full close is smaller and, therefore, it functions quickly with a smaller action.

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Q We would like to have valves that function with light finger load as well as heavy finger load. How can we obtain such products from Mitani?
A The spray load is adjusted by changing the spring load. At Mitani, we have various types of springs for standard products which have different spring loads under a sealed condition as well as different stroke loads in a condition where the valve is opened by a push-down action.
Sometimes, you need a structure that functions under a light load as well as under a heavy load in the same type of valve and product. In this case, actuators such as actuators are changed for the purpose of decreasing the spray load. A trigger actuator with a hinge is one option.
If you let us know the purpose of use, we will suggest the most appropriate specifications of valves and actuators.

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Q Valves are used for various products such as insecticides, paints, cosmetics, and industrial products and we are not sure which valve is best for our product. Can we receive help and advice as to which valve best fits our product?
A Mitani has been a specialty company for developing and manufacturing aerosol valves for nearly 50 years. Our experience accumulated over the years enables us to suggest the most appropriate valve specifications for your product until you find the best valve based on the data that we have accumulated. The basic specifications are determined by the purpose of use, content, and expected spray amount of the product. As the contents of aerosol products vary, we need to carry out a compatibility test of your contents and valve parts with you. We can help and support you until your product is successfully launched into the market. We promise confidentiality.
Aerosol products are classified by spraying patterns: air sprays such as insecticide and deodorant sprays discharge the contents into the air and need fine mist; surface sprays such as hair sprays, paint sprays, and cleaners discharge the contents on a surface; foaming sprays such as shaving sprays and hair mousses discharge the contents in a foamy form; powder sprays discharge solid fine powder; and paste spray discharges high viscosity gel and paste. We can handle various types of contents. Please consult our sales representatives.

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Q We plan to send sample contents to Mitani. Can you carry out tests to choose the most appropriate valve?
A We are very happy to carry out tests and choose the valve for you. Please contact us in advance and send us about 1 litter of the sample for a (3-month) stability test and inform you of our proposed valve. It would be of great help if you let us know the characteristics of the gas (the propellant, the ratio of the contents to the propellant) you plan to use when you send us the sample.

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Q Although we would like to order the sample of a Mitani product, we cannot decide which specifications we need.
A Please let us know the purpose of use of your product and the name of an already-marketed product which can be used as a reference to your planned product if one exist. We will suggest appropriate specifications and send you the best sample. Please visit our website and use the "Contact Us" form, or contact one of our sales representatives.

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Q When we look at the structure of valves, there are two types of valves; one is an inner set pipe type and the other is an outer set pipe type. What is the difference between these two types? Can we change the inner set pipe type to the outer set pipe type?
A Whether a valve is the inner set pipe type or the outer set pipe type depends on the type of pipe (also called "dip tubes").
General pipes are usually the outer set type, and all the capillary pipes are the inner set type. The pipe set type sometimes cannot be changed depending on the type of housing. However, we can change the outer set type to the inner set type if the outer set type housing has the same diameter as that of the inner set type.

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Q When we look at the structure of valves, some housings have an orifice on the side. Why is it there?
A This orifice on the side is called a "vapor tap" that is put for the purpose of mixing the vapor phase consisting of vaporized propellant (gas) and the liquid phase consisting of liquefied contents in the housing, forming fine mist. It has an effect on the spray amount and the spray pattern. Previously, this orifice was often used to adjust spray action (called "flame testing", where the contents are sprayed toward fire to check the flames). However, currently, this orifice is used to make finer mist, decreasing the cold feeling when it reaches the surface, and also to reduce the spray amount.

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Q What is rubber A and rubber B used in inner gaskets?
A As tolerance for the contents is one of the most important features of gaskets (also called "ring gaskets") used in the outer part, the type of gasket is chosen depending on the purpose of use. There are rubber A and rubber B in the stem rubber (inner gasket). These rubbers should be properly used depending on the type of content. There are also rubbers with various grades that have different sealing effects. Rubber A and rubber B are the names of the rubbers used in Mitani products describing a different grade. The physical characteristics of the contents are often trade secrets and companies do not like to disclose them. Mitani will offer appropriate specifications including the type of rubber after receiving information on your planned product (we promise confidentiality) and taking into consideration the characteristics and appropriate range of various rubbers.
We may change the ratio of the vapor tap size and the lower orifice size for the purpose of adjusting a spraying feature. We also have various housings. We believe that, in many cases, you can find the appropriate one among them. However, if you have special specifications, we will make a tailor-made product. Please consult our sales representatives for more detailed information.

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Q Can we change the size of the lower orifice and the side orifice (vapor tap)?
A We may change the ratio of the vapor tap size and the lower orifice size for the purpose of adjusting a spraying feature. We also have various housings. We believe that, in many cases, you can find the appropriate one among them. However, if you have special specifications, we will make a tailor-made product. Please consult our sales representatives for more detailed information.

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Q There are type YP and type OP for upright/inverted valves. Please explain the difference and proper use of the two types.
A The upright/inverted valves allow cans to be sprayed both in an upright or upside down position.
The type YP valve allows cans to be sprayed when the cans are in an upright or tilted position.
The type OP valve allows cans to be sprayed when the cans are in an upright, tilted, or upside down position.

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On accessories
Q What is the Mechanical break up actuator?
A This actuator makes fine mist by giving a rapid rotatory characteristic to the contents near the jet nozzle before spraying. The purpose of this actuator is to make fine mist. We will suggest the actuator which is best for your required spray particle size.

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Q We would like to spray finer mist more softly. Do you have any suggestions?
A There are several ways to make finer mist that is sprayed more softly -- changing the size of the side orifice of the housing ("vapor tap"); reducing the diameter of the actuator nozzle; reducing the screw width on the tip of the valve actuator. If you would like to have the finest mist, we also have a double mechanical break-up actuator (also called a "tissot actuator").
We will suggest an appropriate valve system and actuator that best fit the spray particle size of your product.

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Q There is a screw on the tip of the valve actuator. How does this screw work?
A This screw is to give a rapid rotatory characteristic to the contents near the jet nozzle and thus make fine mist. This screw makes spray particles smaller when the contents are discharged from the jet nozzle. Although standard actuators can make mist, rotating the particles makes finer mist.

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Q What is the detachable (easy separate spout) spout?
A The top portion of foam-type aerosol cans (actuators) are called "spouts". The detachable (easy separate) spout was developed to decrease industrial wastes so that sorting out of plastic parts of used aerosol cans can easily be carried out before disposal. This spout has a mechanism to easily detach the actuator from the can. If you plan an environmental-friendly product, please consider the use of this spout.

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Q What is the tissot actuator?
A Aerosol products can be classified into two categories depending on the physical characteristics of gas used as the propellant.
In liquefied gas type products, compressed and liquefied gas is used as the propellant, and in compressed gas type products, compressed and high pressure gas is used as the propellant.
In the compressed gas type products (its contents are usually liquid), we cannot use a side orifice (vapor tap) to mix the vapor phase with the contents within the housing to make finer mist as we do in the liquefied gas type products where liquefied gas is dissolved in the contents. Although standard actuators can make mist, using this actuator enables to discharge finer mist in an wider area evenly. The tissot actuator can be used on both the liquefied gas type and the compressed gas type products. We also call it a "double mechanical break-up actuator".

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Q We plan to develop a powder product. How can we decide the size of the jet nozzle orifice?
A In powder aerosol products that discharge solid fine powder, a narrow orifice could make the jet nozzle clog due to accumulated powder although this does depend on the quality of the powder. In this case, it is better to have an orifice as wide as possible. We have a powder jet nozzle as one of our standard products. In powdery products, the actuator should be selected from a comprehensive viewpoint by checking not only the jet nozzle orifice but also the valve specifications. Since which valve actuator should be used in powdery products largely depends on the type of content, the final decision is made after results from compatibility tests. Please let us know the details of your planned product. We will suggest the most appropriate specifications of the valve and the actuator.

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Q We would like to have only a actuator with a nozzle tip. To whom do we make such a request?
A You probably mean only accessories, not the total valve system. If so, we are very happy to provide you with only accessories. Our designer will make a proposal which could enhance your design. As we want to avoid any leak or problem, please inform us of the external diameter of the stem and the actuator design of your planned product.

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On pumps
Q How does the pump discharge the contents?
A The mechanism of the pump to discharge the contents is the same as that of a syringe. The contents in a bottle is collected through the pipe and sent to a tank. The contents in the tank is pushed again to be discharged (or sprayed).

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Q How is air taken into the bottle when the contents are discharged from the pump?
A When the contents are discharged from the pump, there is an airway which opens to take in air into the bottle. When pumping, space between the screw cap and the piston through the side orifice of the cylinder, different from the channel for discharging the contents, leads air into the bottle. This airway is closed to avoid any leakage when not pumping.

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Q Why do the contents come out in mist form when spraying?
A In pumping, the pressure of the contents increases. There is a spiral groove in the inner mechanism of the nozzle that works as a screw. The pressurized content is rotated by this screw and when the content passes through the jet nozzle, this pressure makes the content misty. This mechanism is the same as that of a water sprinkler in a garden.

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Q We would like to have finer mist.
A As the pump works under the same mechanism as a syringe, finer mist can be produced by increasing the inner pressure or changing the nozzle type. Depending on the viscosity of the contents, there are limitations to the inner pressure.
Additionally, when increasing the pressure in the tank within the pump, the spray load increases (in this case, consumers usually feel heavy action) and the tank wall has to be thicker. This is why there are limitations to the increase of the inner pressure.
Generally, finer mist is made by changing the nozzle type without increasing the inner pressure too much. We have various nozzles and you can evaluate our nozzles by yourself whether they make mist fine enough for you. Please let us know the details of your planned product and required spray particle size. We will suggest a solution.

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Q We would like to have a pump which works softly with light finger load.
A Two interpretations are possible when you say "works softly with light finger load"; one is that the pushing load of the pump is light; and the other is that pump action is soft and smooth.
If you would like to lighten the pushing load, it requires low inner pressure and proper adjustment of the spring. In addition to the spring load, the following factors affect the pushing load; viscosity of the contents, sliding resistance of the piston valve, the internal diameter of the cylinder, and flow resistance of the nozzle (nozzle caliber). The spring load is determined depending on the viscosity of the contents. Please let us know what level of pushing load you prefer. We provide various products with different internal diameters of cylinders, different diameters of nozzle caliber, and different springs.
When soft and smooth action is required, uneven surface and unbalanced pushing load must be avoided. When the contents include alcohol, the sliding resistance of the piston valve may increase.
We are ready to discuss with you in a frank manner and propose an idea in order to make a product which is fully in touch with your customers' sensibilities. Please consult our sales representatives.

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Q Is it possible to spray gas, not liquid?
A Although it is technically possible, we have not produced a pump which discharges only gas without liquid. Please let us know the details of your planned product. We will discuss with you and make an effort to meet your needs.

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Q What is the difference between the pump spraying a mist and the one discharging an emulsion?
A The mist pump and the emulsion pump basically have the same discharging mechanism and inner structure. The nozzle section is different. In a mist pump, the pipe of the pump is narrow to allow the increase of pressure and to avoid dripping after spraying. If your product is meant to spray a fine mist, we provide an accumulator injection pump. In an emulsion pump, the pipe of the valve is wider to discharge high viscosity contents smoothly which allows the contents to be pushed at a constant rate from the initial push.

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Q Please explain the difference between the direct injection system and the accumulator injection system.
A The direct injection system is used for emulsion and shampoo products to discharge the contents with static pressure. It is also called the "drop type". This system is used to discharge various emulsion and high viscosity contents.
The accumulator injection system gives pressure to the contents and a valve is opened for discharging when the pressure reaches a certain level. Since the pressure is applied to the contents, it is appropriate for a mist-type product. Therefore, it is also called the "mist type". This system is used for air sprays such as perfume and hair sprays.

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Q Do you carry out tests to chose the appropriate pump if we send a sample of the contents to Mitani?
A We are very happy to carry out the test and choose the pump for you. Please inform whether you would like the contents to be discharged as a mist or an emulsion, and the discharging amount per pumping. We will check the spray load of various pumps and inform you of our proposed pump. We will also send you a sample pump. You can change the pump to best fit your customers. We believe that your product is improved by checking the sample on both ends, you and Mitani.
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Q Our planned product has high viscosity. Do you have any limitations on the level of viscosity of the contents?
A As far as we know, our products can be used on contents with extremely high viscosity, up to about 20,000 cP(g/(cm.s)poise). However, it does depend on the specific gravity and other factors of the contents as well. Please send us a sample of your contents and let us know the purpose of use. We will carry out compatibility tests and inform you of the results.
It is very important to put the contents in a bottle and carry out the test in a practical manner.

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Q The tip of the nozzle is clogged with the contents. Are there methods to prevent this clogging?
A To prevent clogging, we recommend that you use a cover on the nozzle to avoid contact with air, or a structure that draws the remaining contents into the pump after discharging.
Please send us a sample of your contents. Our technical staff will check the contents and suggest the best idea.

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Q What are the essential factors to determine the specifications of the pump?
A The basic factors are 1) the characteristics of the contents and 2) how to discharge the contents (spraying as a mist or discharge as an emulsion), and 3) the spraying amount (per pumping). The presence or absence of a bottle on your side affects the size of the screw. Additionally, the spraying patter is also a necessary factor. The design and the color of the pump are important to attract consumers. Please send us a sample and we will check and propose the best product for you.

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Q How is the spraying/discharging amount measured?
A We put the contents in a bottle and pump the bottle 10 times consecutively to measure the average spraying/discharging amount. This average is the spraying/discharging amount we usually quote. In our internal performance test, we use water to measure this spraying/discharging amount.

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Q Is it necessary to change the pump depending on the type of the contents?
A Generally speaking, you do not have to change the pump depending on the type of the contents; it depends on the purpose of use (spraying a mist or discharging an emulsion). However, the contents may include a substance which are incompatible with some parts (such as resin) of the pump. Please feel free to consult our sales representatives, We will carry out compatibility tests for your products.

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Q What is HVD? Can a Mitani product be used for a product with any level of viscosity?
A HVD stands for high viscosity dispenser, a pump system including the bottle for high viscosity contents. We call it "airless pump", a pump system using a vacuum produced by lifting the bottom of the bottle. As far as we know, this pump can be used on contents with extremely high viscosity, up to about 20,000 cP(g/(cm.s)). However, it does depend on the specific gravity and other factors of the contents as well. Please send us a sample of your contents and let us know the purpose of use. We will carry out compatibility tests and inform you of the results.

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Q Do you have a pump which can be attached to a can (aluminum can, for example)?
A Are you asking whether Mitani has pumps which can be attached to aerosol cans or screw-type cans? If so, we have products to meet your needs. If the screw size of your product is not the standard one, we need to check whether our products fit your can.
Please feel free to contact us. We will offer the best idea for you.


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