Several characteristics and operating principles of NORGREN solenoid valve

Several characteristics and operating principles of NORGREN solenoid valve
NORGREN solenoid valve controls the on/off of fluid flow in the internal rotation control pipeline; Another type is the straight stroke electric valve: it is used in conjunction with a straight stroke valve by a straight stroke electric actuator to control the fluid flow in the pipeline through the up and down movement of the valve plate. Usually used in conjunction with highly automated equipment, this valve is horizontally installed to adjust accuracy.
Operating principle of NORGREN solenoid valve: Electric valves are usually connected by electric actuators and valves, and become electric valves after installation and commissioning. Electric valves use electrical energy as power to connect the electric actuator and drive the valve, achieving the opening and adjusting actions of the valve. Thus achieving the purpose of switching or adjusting the pipeline medium.
NORGREN solenoid valve is a type of electric valve; It uses the magnetic field generated by the electromagnetic coil to pull the valve core, thereby changing the on/off of the valve body. When the coil is powered off, the valve core retracts by the pressure of the spring.
Structural characteristics of electric gate valve
① The valve adopts pressure self tightening sealing or valve body and valve cover gasket sealing structure, trust! Use safely.
② The valve disc adopts a double gate plate with a universal top structure in the middle, which can automatically adjust the degree of fit between the valve disc and the sealing surface of the valve seat, ensuring the sealing of the valve. At the same time, this structure is easy to maintain, saves costs, and has good interchangeability of valve discs.
③ The sealing surface of the valve disc and seat is made of cobalt chromium tungsten hard alloy by ion spray welding. The sealing surface has high hardness, wear resistance, abrasion resistance, and long service life.
④ The valve stem is made of nitriding steel, with surface nitriding treatment, high hardness, scratch resistance, corrosion resistance, and long service life.
⑤ The NORGREN solenoid valve device is equipped with a torque control mechanism, on-site operating mechanism, and manual/electric switching mechanism. In addition to on-site operation, remote operation, PLC control, and intelligent control of 4-20mA current input and output can also be performed.
⑥ The NORGREN solenoid valve is opened by a manual mechanism or a handwheel upon impact. Reduce valve operating force.
⑦ Valves can be installed at any position in the pipeline, and carbon steel or alloy steel valves can be selected based on the medium and its temperature.
⑧ When installing and debugging for the first time, the valve must be manually opened to about half of the position to avoid damage to the valve or electrical components caused by reverse motor phase sequence connection.
Application scope of NORGREN solenoid valve
1. Oil and natural gas transmission pipelines. Flat gate valves with diversion holes are also convenient for cleaning pipelines.
2. Transportation pipelines and storage equipment for refined oil products.
3. The wellhead equipment for oil and natural gas extraction, also known as valves for Christmas trees.
4. A pipeline containing suspended particles.
5. Urban gas transmission pipeline.
6. Water supply project.
Regarding the operating mechanism of NORGREN solenoid valve
The opening and closing direction of the 1NORGREN solenoid valve should always be clockwise when operated.
Due to the fact that pneumatic valves in the pipeline network are often manually opened and closed, the opening and closing speed should not be too high, even large diameter valves should be turned inside.
For the convenience of one person's opening and closing operation, the maximum opening and closing torque should be 240N-m under the pressure of pipeline workers.
The opening and closing operation end of the pneumatic valve should be square tenon, standardized in size, and face the ground, so that people can directly operate it from the ground. Valves with discs are not suitable for underground pipelines.
Display panel for the opening and closing degree of 5 pneumatic valves
① The scale line for the opening and closing degree of pneumatic valves should be cast on the gearbox cover or the outer shell of the display panel after changing direction, facing the ground uniformly. The scale line should be brushed with fluorescent powder to indicate visibility;
② The material of the indicator disk needle can be made of stainless steel plate under good management, otherwise it is a painted steel plate and should not be made of aluminum sheet;
③ The indicator pin should be conspicuous and securely fixed. Once the opening and closing adjustment is accurate, it should be locked with rivets.
If the pneumatic valve is buried deep and the distance between the operating mechanism and display panel and the ground is ≥ 1.5m, an extension rod facility should be installed and firmly fixed for people to observe and operate from the ground. That is to say, the opening and closing of valves in the pipeline network is not suitable for underground operations.
Performance testing of pneumatic gate valves
When a valve of a certain specification is mass-produced, a commissioned organization should be commissioned to conduct the following performance tests
① The opening and closing torque of the valve under working pressure conditions;
② The continuous opening and closing times of the valve that can be tightly closed under working pressure conditions;
③ Detection of flow resistance coefficient of valves under pipeline water delivery conditions.
Valves should undergo the following tests before leaving the factory:
① When the valve is in the open position, the valve body should withstand an internal pressure test of twice the valve working pressure value;
② Under the closed condition of the valve, both sides can withstand 1.1 times the valve working pressure without leakage; But for metal sealed butterfly valves, the leakage value should not exceed the relevant requirements.
Internal and external anti-corrosion of pneumatic valves
The inside and outside of the valve body (including the gearbox) should first be shot blasted, sandblasted, and rust removed, striving for electrostatic spraying of powder non-toxic epoxy resin with a thickness of 0.3mm or more. When it is difficult to electrostatically spray non-toxic epoxy resin on extra large valves, similar non-toxic epoxy paint should also be brushed or sprayed.