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Product Q&A

Solenoid Valve/Motor Valve/Air Operated Valve

How much water droplet can DP-100 solenoid valve endure?

The coil itself is in degree of protection IP64 (JIS C 0920).
For the terminal box, Model TN-1and TN-2: IP03, Model TN-1C and TN-2C: IP54.

On what intensity scale of an earthquake does emergency shutoff valve operate?

It operates on about intensity 5 upper.

When the power is cut off during energized, in which state is a motor valve?

When the power is cut off, motor valve is in half-opened condition.

When the power is cut off during energized, in which state is a solenoid valve (air operation valve) ?

When the power is cut off, normally closed type (NC type) is in closed condition. Normally opened type (NO type) is in open condition.

Abnormal sound can be heard from the coil of a solenoid valve during energized. Is it a problem?

No problem. When the product is used with AC voltage, it may produce a buzzing sound depending on the conditions of use.

How long is the service life of a solenoid valve?

Although the service life (number of operation time) changes with operating condition, model, etc., 100,000 - 500,000 times operation is a standard.
However, DP-100 has recorded 750,000 times operation in in-company tests.

Can a throttle valve be used for inlet side of solenoid valve?

Do not use throttle valve and pipes smaller than nominal size of solenoid valve.

Can a solenoid valve be kept warm?

Do not keep a solenoid valve warm.

Can a solenoid valve be used with a three phase power supply?

Our solenoid valve is a single phase 2-wire system.
For a three phase power supply, use two lines, and make sure to insulate the one remaining line.

Can a solenoid valve be used at a place with explosive gas?

DP-34 with explosion-proof structure can be used.

The coil gets hot during solenoid valve is energized. Is it satisfactory?

Satisfactory. The coil rises to about 70 by being energized.

Please let me know about the power consumption of the coil of a solenoid valve.

See solenoid valve document.

Image:Solenoid valve document.
Solenoid valve document.
Is it possible to use a solenoid valve outdoors?

It is possible. Place protective covers or guards above the product in order to avoid exposure to water.

What is ambient temperature when using a solenoid valve?

Not applicable to freezing. It is the environmental temperature of product instllation place. Use it below 50 . Do not keep the coil warm.

Can fluid with high viscosity be used for a solenoid valve?

Fluid with less than viscosity 20 cSt can be used.

What is the difference between pilot type and direct acting type?

General differenceare as follows;
Pilot type: large flow rate, large product size
Direct acting type: smalll flow rate, small product size

Please give me some instructions about the installation direction of a solenoid valve.

See solenoid valve document.

Image:Solenoid valve document.
Solenoid valve document.
Which size of mesh is recommended for the strainer before solenoid valve for steam to prevent foreign substances?

According to Construction standard specifications (for the construction of machinery and equipment) issued by Public Buildings Association [the 2004 edition], 80mesh or more. We recommend 80 - 100 mesh.

Although the connection portion of new DP-100 series is made of stainless steel, is there any problem about galvanic corrosion with a steel pipe?
In addition, is there any problem to exchange the solenoid valve made of bronze (DP-10) in use to the one made of stainless steel (DP-100)?

There is no problem.
Since galvanic corrosion influences the surface area ratio of wetted parts greatly, most influences of galvanic corrosion can be disregarded for real piping with larger surface area of steel pipe than stainless steel.
Although we sell the product with stainless steel made conenction parts other than DP-100 series, there is no case where galvanic corrosion become a problem until now. In addition, the corrosion potentials of bronze and stainless steel is almost the same.
Since there are no difference in condition of galvanic corrosion and no problem with bronze, it can be said that there is also no problem for stainless steel.

When installing an ON-OFF valve such as a solenoid valve or a motor valve around the pressure reducing valve, how much distance, for a minimum, should be needed between these two valves?

When installing a solenoid valve, etc. that opens/closes very quickly, it should be placed before the pressure reducing valve (if possible), keeping a proper distance (3m and more is recommended.).

What kind of problem is expected when the outlet pressure of a solenoid valve exceeds the inlet pressure?

The valve does not close and backflow occurs. Set a check valve at the outlet side of the valve, or any other measures should be taken in such a way that the outlet pressure is kept not to exceed the inlet pressure.

Please give me some instructions about the installation direction of a solenoid valve.

The valve can be installed horizontally or vertically as you desire basically, however, the vertical installation is limited to the condition that the differential pressure between the inlet and outlet sides is 0.1MPa or more. Yet, we recommend the horizontal installation where possible, because the vertical piping tends to cause malfunction in the sliding part due to the scales after a long period of stoppage. In the case of the horizontal piping, the valve must be installed with its coil upward or at least at the horizontal position. Do not install the valve with the coil downward.

Can a solenoid valve be installed to a place where the piping may be frozen?

No. In case of a possible frozen pipe, keep the valve casing warm or take some other measures to prevent freezing.
However, do not keep the coil warm. If kept warm, the suction power of the coil may be reduced or the coil may be burned.

How many times of operation does DP-10 can endure?

We confirmed that the valve works in good conditions even after 100,000-time operation through the duration test.

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