German Pneumatrol valves Pneumatrol models Pneumatrol prices

Pneumatrol valves are valves that reduce the inlet pressure to a required outlet pressure through regulation, and rely on the energy of the medium itself to automatically maintain stable outlet pressure. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element with variable local resistance, i.e., by changing the throttling area, the flow velocity and kinetic energy of the fluid are changed, causing different pressure losses, thereby achieving pressure reduction. Then, through the regulation of the control and adjustment system, the fluctuation of the pressure after the valve is balanced with the spring force, keeping the pressure after the valve constant within a certain error range.

Pneumatrol valve working principle

The pressure reducing valve reduces water pressure by the local resistance of the flow channel inside the valve to the water flow. The range of water pressure drop is automatically adjusted by the water pressure difference between the inlet and outlet on both sides of the diaphragm or piston connected to the valve disc. The fixed-ratio pressure reduction principle uses the water pressure ratio of the floating piston in the valve body for control; the pressure reduction ratio between the inlet and outlet ends is inversely proportional to the area ratio of the pistons on the inlet and outlet sides. This pressure reducing valve operates smoothly without vibration; there is no spring inside the valve body, so there is no concern about spring corrosion or metal fatigue failure; the sealing performance is good with no leakage, thus reducing both dynamic pressure (when water is flowing) and static pressure (when flow rate is 0); especially, it reduces pressure without affecting the water flow rate. The pressure reducing valve regulates the flow rate of the medium by adjusting the opening degree of the closing piece in the control valve body, reduces the pressure of the medium, and at the same time adjusts the opening degree of the closing piece with the help of the pressure after the valve, keeping the pressure after the valve within a certain range, and injects cooling water into the valve body or after the valve to reduce the temperature of the medium; this type of valve is called a pressure reducing and desuperheating valve. Kuaiyiyou Automation Selection includes pressure reducing valves. The characteristic of this valve is to keep the outlet pressure and temperature value within a certain range when the inlet pressure changes continuously.

Pneumatrol valve installation precautions

1) Before installing the valve, carefully check whether the model and specifications of the valve used match the design; 2) Check and compare according to the valve model and factory instruction manual to see if the valve can be applied under the required conditions; 3) When lifting the valve, the rope should be tied to the flange connection between the valve body and the valve cover, and do not tie it to the handwheel or valve stem to avoid damaging the valve stem and handwheel; 4) When installing the valve on a horizontal pipe, the valve stem should be vertically upward, and downward installation of the valve stem is not allowed; 5) When installing the valve, do not use forced alignment connection methods such as pulling hard, to avoid damage caused by uneven force; 6) Rising stem gate valves should not be installed in underground damp places to avoid corrosion of the valve stem.

Pneumatrol valve troubleshooting

In some pressure reducing control circuits, the outlet pressure of the pressure reducing valve is used to control the control oil pressure of electro-hydraulic directional valves or externally controlled sequence valves, etc. When the electro-hydraulic directional valve or externally controlled sequence valve reverses or works, the flow rate at the outlet of the pressure reducing valve becomes zero, but the pressure still needs to maintain the originally set pressure. In this case, since the flow rate at the valve outlet is zero, the flow rate through the pressure reducing port is only the pilot flow. Since the pilot flow is very small, generally within 2L/min, the main valve pressure reducing port is basically close to the fully closed position (very small opening), and the pilot flow flows out from the triangular groove or inclined cone surface. If the fit of the main valve core is too loose or the wear is excessive, the leakage will increase. According to the continuity theorem of flow, this part of the leakage must also flow from the damping hole of the main valve core, that is, the flow through the damping hole consists of two parts: pilot flow and leakage. Since the area of the damping hole and the oil pressure in the spring chamber of the main valve remain unchanged (the oil pressure in the spring chamber is determined by the pre-compression amount of the adjusted pressure regulating spring), to increase the flow through the damping hole, the oil pressure in the lower chamber of the main valve will inevitably rise. Therefore, after the outlet pressure of the pressure reducing valve is set, if the outlet flow is zero, the outlet pressure will rise due to the loose fit or excessive wear of the main valve core.

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