double check seat

Abstract

The invention provides a bidirectional blocking valve which comprises a pneumatic actuator. The pneumatic actuator is a group of air cylinders. The air cylinders are sealed by an upper cover and a lower cover which are combined. Each air cylinder is separated into an upper air chamber and a lower air chamber by a piston, an upper air nozzle and a lower nozzle are respectively used for inflating and deflating the two air chambers, and the piston moves up and down under the inflating pressure of the air nozzles. The double-block valve seat is characterized in that movable shafts at two ends of each piston, first seal rings (04u and 04d), and a second seal ring form a movable shaft air chamber, and the air in the air cylinder always emits through the air chamber. The bidirectional blocking valve has the advantages that bidirectional blocking of the pistons of the pneumatic actuator is achieved, namely bidirectional blocking of a valve seat and a valve element is achieved, impact of the valve element on the valve seat is reduced, namely buffer effect is achieved at the moment when the valve element is about to contact with the valve seat, the valve element, the seal rings, and the valve seat are protected from being damaged by impact, noise is reduced, and the service life of a product is prolonged.

Description

technical field [0001] The invention relates to a flow control device for beverage, food, medicine or biotechnology products, in particular to a double blocking actuator on the flow control device. Background technique [0002] Most of the seat valves currently on the market, the actuator cylinder is composed of upper and lower covers, which are airtight as a whole. The piston inside divides the cylinder into two air chambers. The air chamber of the double-acting cylinder is inflated and exhausted by two air nozzles. The function is inflated and exhausted by one air nozzle, and the other air nozzle is replaced by the muffler, which is reset by the spring in the cylinder. If one air nozzle is inflated, the piston starts to move under the pressure, and the gas is directly discharged through the other air nozzle. In the discharge path, there is no pre-added resistance, and the gas is discharged quickly without any resistance, which leads to a large impact force on the valve cor...

AI Technical Summary

Problems solved by technology

[0002] Most of the seat valves currently on the market, the actuator cylinder is composed of upper and lower covers, which are airtight as a whole. The piston inside divides the cylinder into two air chambers. The air chamber of the double-acting cylinder is inflated and exhausted by two air nozzles. The function is inflated and exhausted by one air nozzle, and the other air nozzle is replaced by the muffler, which is reset by the spring in the cylinder. If one air nozzle is inflated, the piston starts to move under the pressure, and the gas is directly discharged through the other air nozzle. In the discharge path, there is no pre-added resistance, and the gas is discharged quickly without any resistance, which leads to a large impact force on the valve core connected to the piston, and the impact force may cause damage to the valve core, valve core sealing gasket, and valve body. Affect the service life, and at the same time, the strong impact force will also bring mechanical noise, causing environmental noise pollution. Similarly, the single-acting cylinder is reset by a spring, and the elasticity of the spring also makes the piston move quickly, which also produces a strong impact force, resulting in the above-mentioned same result

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