Sequence Valves Hydraulic Control Valve

1 How it works: according to the working principle and structure, sequence valve direct-acting type and pilot sub-type categories; according to pressure control mode, sequence valve with internal control and external control of the points. In the sequence valve is equipped with a one-way valves, flow through the reverse order of the composite valve called the one-way valve. In general, such valves are used frequently.

2 Function and application: the order of basic function is to control valve actuators of the order of several actions, according to their different functions, are called sequential valve, back pressure valves, unloading valves and balancing valve. Sequence valve is basically the same performance and relief valve, but because of the different functions of the order of valves have their special requirements:

(1) In order to enable the implementation of components to achieve an accurate sequence of actions requiring the order of the regulator valve, high precision, bias is small;

(2) To the accuracy of the order of moves to require valve closed in a small amount of leakage;

(3) for one-way valves in order to require the reverse pressure loss and pressure loss in the value should be less positive.

     The main functions of the order of valve:

(1) control over the order of movement components;

(2) for packing circuit;

(3) to prevent fuel tank caused due to dead weight piston free-fall done Valves use;

(4) with external control valve in order to do unloading valve, the pump unloading;

(5) with the internal control sequence valve for back pressure valve.

Sequence valve manufacturers produce three products: domestic mainly Yuci hydraulic Group Co., Ltd., Beijing, China and Germany Hydraulic Group Co., Ltd., Shanghai Lixin Hydraulic Component Factory and so on. Outside the United States Vickers, Germany, Rexroth and other manufacturers.

4 Sequence Valve Selection: sequential valve assembly structure according to the different, you can implement different circuit functions, such as relief valves, sequence valves and balancing valve function.

     If the valves open and close characteristics of the order of poor, then the flow of a larger pressure is too high, loop and reducing efficiency. Open and close with a hysteresis feature, open the pressure below the closing pressure, the load flow rate changes should be noted. The valve opening pressure is too low, then the pressure below the set pressure before the leak occurred, causing the actuator malfunction. The flow through the valve is far less than the rated flow, vibration, or other instability. At this point the road to return to action. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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