What is the role of bypass valve, a detailed explanation of the difference between the pilot valve and bypass valve
Pilot type safety valve is a kind of indirect load type safety valve, composed of the main valve and pilot valve (also known as “auxiliary valve”); The word bypass valve refers to the valve installed in the bypass pipeline, but does not specifically refer to the type and structure of the valve, many people are not clear about both cognition, so what is the role of the bypass valve? Like valve to explain the difference between pilot valve and bypass valve!
A, what is the role of bypass valve
1. Bypass valve refers to the valve installed on the bypass pipe, but does not refer to the type and structure of the valve. The bypass valve can also be called the independent bypass differential pressure valve. Self – operated differential pressure control valve.
2. Bypass valve is mainly used in air conditioning system and main pipe between water collector and water distributor of water chiller. The principle is to sense the water pressure at both ends of the water collector and distributor through the differential pressure controller, and then calculate the difference according to the pressure tested.
3, the differential pressure controller according to the calculation of the difference and the preset value of the comparison, to determine the output stability, to control the valve to increase or reduce the opening, so as to regulate the water.
4, bypass pipe as a standby pipe, the role is in the pressure reducing valve, steam trap and other equipment failure or need to be replaced and maintenance isolation, or close the main pipe, open bypass pipe, so that the equipment continues to run.
Two, the difference between pilot valve and bypass valve
Pilot valve:
Auxiliary valves are used to operate control mechanisms in other valves or components.
Characteristics of pilot valve:
1, and the fixed liquid resistance to form a pilot control liquid bridge, according to the input signal to control the main valve, secondary valve or variable bar;
2, the flow of a pilot valve is generally only about 1 liter/minute, 3 liters/minute larger. The flow rate of two pilot valves should be determined according to actual needs.
3, the input signal is small;
4, can accept manual, electric, hydraulic, pneumatic, mechanical CAM, electric ratio and other input methods;
5. In the case of variable pump control, various pilot valves form a modular structure, and various functions are convenient to choose;
6, pilot valve itself is often a small control valve, mostly for pressure control valve.
Characteristics of pilot valve:
1. Pressure difference between both ends of constant valve and controlled system supports variable flow operation of user system;
2, rely on differential pressure automatic work without external power;
3, can directly display the control pressure difference;
4, can directly set the control pressure difference;
5, control differential pressure adjustment sensitive, simple operation;
6, medium temperature :0~150¡æ;
7, adjustable range of control pressure difference :0.05~ 0.6MDA;
8, control pressure difference error ¡Ü¡À5%.
Post time: May-26-2022
