Questions regarding solenoid valves with built-in venting
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I wonder if there are any 2/2 direct-acting solenoid valves with a built-in venting mechanism? Used for emergency shutdown of natural gas media (pressure 0.4 MPa); micro structure (bore diameter of 4 or 6). Its function is identical to that of a 2/3 way solenoid valve; it operates in the normally open mode (closes when powered, and the gas supply is cut off while the gas outlet is emptied); conversely, it opens when power is lost, with the gas supply connected to the outlet and the system being emptied to achieve closure). Although two-way three-port solenoid valves can meet the requirements, they are not available in the market for use with natural gas, and their reliability in operation is low due to structural reasons ； Therefore, when looking for such a two-position two-way direct-acting solenoid valve with a built-in relief mechanism, it is necessary that the structure be simple and the operation reliable.
ASCO, Nuoguan, and Baode all offer what are known as cartridge solenoid valves, but they are of the pilot-type; pilot-type valves have a much longer service life than automatic-type ones
Pneumatic solenoid valves are far too common; I won’t ask about them here. What I need is a solenoid valve with a compact design, to enable remote control of a gas emergency shut-off valve (note that this is a shut-off valve specifically used in the gas industry, not the ordinary shut-off valves used in chemical plants that require an external air supply). A pressure-loss shutdown control scheme is intended to be employed, which is why the solenoid valve in question is required. Furthermore, when used with natural gas as the medium, there are trace impurities such as dust present; therefore, the design needs to be simple and reliable in operation. Since it is merely an accessory, a pilot-operated design cannot meet these requirements, and those models that come equipped with a built-in venting function are even harder to find. Personally, I think it should be possible to equip the two-two-way direct-acting solenoid valves with a venting mechanism.
You can check out the solenoid valves from the Burkert brand; it’s a German brand, and I remember there are models available that meet your needs, with a manual control device.
Aren’t there relevant gas emergency shut-off valve products available? There are two more two-way connections, and discharge is also required – isn’t that a contradiction?
Typically, gas emergency shut-off valves are designed for local over-pressure protection and cannot be operated remotely. In the gas industry, large-diameter solenoid valves or electric valves are usually used for emergency shutdown purposes. However, large-diameter solenoid valves consume a lot of power, while electric valves take relatively long times to achieve shutdown; this is especially a problem with high-pressure pipelines, where reliability is insufficient. Therefore, it is attempted to operate the emergency shut-off valve by controlling smaller solenoid valves.