Pneumatic film adjusting valve

Abstract

The invention provides a pneumatic film adjusting valve. The pneumatic film adjusting valve comprises a valve body, a valve seat, a valve element, a valve rod, a support, connection pipes, a push rod, a lower film cover, a spring, a membrane and an upper film cover, wherein the valve seat is arranged at one end of the valve body; the hemispherical valve element is fixedly arranged on the surface of the valve seat; the valve rod is fixedly connected to the surface of the valve element and arranged inside the support; the two connection pipes are arranged at one end of the support, one ends of the connection pipes are connected with the push rod, and the other ends of the connection pipes are fixedly connected with the lower film cover; and the spring is arranged on the lower film cover. The pneumatic film adjusting valve is compact in structure. A pneumatic film pushes the valve element to move in order to achieve on-off control, the valve seat is provided with a supporting spring and a movable sealing gasket, and the valve element is provided with a matching groove, so that on the situation that the air leakage probability of an executing mechanism is reduced, reliability is high and the service life is ensured. Moreover, the pneumatic film adjusting valve is low in cost and high in sealing performance, use stability and use security are guaranteed, the overall sealing performance is high, and applicability and practicability are good.

Description

technical field [0001] The invention relates to a regulating valve, in particular to a pneumatic film regulating valve. Background technique [0002] Pneumatic film regulating valve is a kind of regulating device in the combination instrument of pneumatic unit, and it is one of the important devices in the automatic regulating system of production process. The regulating valve is composed of electric actuator or pneumatic actuator and regulating valve. Control valves are usually divided into straight-through single-seat control valves and straight-through double-seat control valves. The latter has the characteristics of large flow capacity, small unbalance and stable operation, so it is usually especially suitable for large flow, high pressure drop and leakage. few occasions. It accepts the output signal of the regulating instrument to close and open the valve to achieve automatic adjustment of parameters such as pressure, temperature, flow, and liquid level. It can be wide...

AI Technical Summary

Problems solved by technology

Pneumatic diaphragm control valves generally include a top-mounted handwheel mechanism and a pneumatic diaphragm actuator. The top-mounted handwheel mechanism is connected to the pneumatic diaphragm actuator, so there will be several leakage points. In order to solve this sealing problem, a special rubber lining is required. Gaskets are used to help achieve sealing, so the cost is relatively high, and because the rubber-lined gaskets are easy to age, the reliability is relatively low

Images