brand information
Description of the structure difference of NORGREN solenoid valve
NORGREN solenoid valve is divided into six sub-categories: the direct-acting diaphragm structure, the step-by-step direct diaphragm structure, the pilot diaphragm structure, the direct acting piston structure, and the difference between the valve structure and the material. Step direct-acting piston structure, pilot piston structure.
When the NORGREN solenoid valve has no pressure difference between the inlet and the outlet, after the energization, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upward, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the energization, the electromagnetic force leads the small valve, the pressure of the lower chamber of the main valve rises, and the pressure of the upper chamber drops, so that the main valve is pushed upward by the pressure difference; when the power is off, the pilot valve uses the spring The force or medium pressure pushes the closure and moves down to close the valve.
Features: It can also be operated at zero pressure difference or vacuum or high pressure, but the power is large, and it must be installed horizontally.
Norgren pilot solenoid valve:
When the NORGREN solenoid valve is energized, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the lower part and the lower part is formed around the closing member. The fluid pressure pushes the closing member upward to move the valve to open; when the power is off, the spring force The pilot hole is closed, and the inlet pressure is passed through the bypass hole to form a lower low and high pressure difference around the valve member, and the fluid pressure pushes the closing member downward to close the valve.
Features: The upper limit of the fluid pressure range is high, can be installed arbitrarily (customized), but must meet the fluid pressure difference conditions.
Internal and external leakage is an essential element of safety. Other self-control valves typically extend the valve stem and control the rotation or movement of the spool by an electric, pneumatic, hydraulic actuator. This must solve the problem of external leakage of the long-acting valve stem dynamic seal; only the electromagnetic valve is applied by the electromagnetic force on the iron core sealed in the magnetic isolation valve of the electric control valve, there is no dynamic seal, so the external leakage is easy to block . The electric valve torque control is not easy, it is easy to produce internal leakage, and even the stem of the valve stem is broken; the structure of the electromagnetic valve is easy to control the internal leakage until it drops to zero. Therefore, solenoid valves are particularly safe to use, especially for corrosive, toxic or high temperature media.
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