Hydraulic control valve is a pressure control valve, which consists of a main valve and its attached to the valve guide catheter � � � needle valve and pressure gauge so on. According to � function and purpose of use in different places can be turned into a remote control float valve valve � � � Slow Close Check Valve Flow Control Valve pressure relief valve � � electric hydraulic control valves, pump control valve.
Hydraulic control valve according to the structure can be divided into two types of diaphragm-and piston-type, the working principle of the same, both upstream and downstream pressure difference of more than △ P as a driving force, composed of the direct valve control, so that diaphragm (piston) hydraulic differential operation, entirely by the hydraulic automatic adjustment, so that the main valve disc valve fully open or fully closed or in the adjusted state. When the entry diaphragm (piston) pressure of water above the control room was relegated to the atmosphere or the downstream area of low pressure, the role of the diaphragm in the valve plate at the bottom and the bottom of the pressure value on the top of the pressure is greater than the value, it will push the main valve disc valve to full the open position; when entering diaphragm (piston) the pressure of water above the control room can not be routed to the atmosphere or the downstream area of low pressure, the role of the diaphragm (piston) at the top of the pressure value is greater than the pressure below the value, it will be the main valve valve disc pressure to fully closed position; when the diaphragm (piston) at the top of the control room of the pressure value at the inlet pressure and outlet pressure of the middle, the main valve in the regulator valve disc on the state of adjustment of position depends on the needle and catheter system Adjustable guide the role of joint control valve. Adjustable guide through the downstream valve outlet pressure, and changes with it to open large or small their own off the small valve port, thus changing the diaphragm (piston) at the top of the control room pressure value, the controlling party of the regulation valve valve disc position.
Hydraulic control valve repair and maintenance of
Hydraulic control valve is a kind of self-use of water-run-type valve, without an additional oil lubrication in case of damage to the main valve parts, please follow the instructions to demolition. (Note: within the valves of the general consumption of goods for the membrane damage and ○-ring, and other internal parts damage rarely)
1. First valve before and after the end of the main valve closed.
2. The main valve cover screws of the piping joints loosened, releasing the pressure valve.
3. All the screws removed, including the control of the necessary copper piping in the nuts. 4. Take valve cover and spring.
5. The shaft core, diaphragm, piston, etc. removed, do not damage membrane.
6. All these things will be taken out, check the diaphragm and ○-ring is damaged; Do not be divided without damage to their own struggle in its internal parts.
7. If found diaphragm or ○-ring is damaged, please loose nut on the shaft core, diaphragm, or decomposition by Zhejiang-ring, remove and re-replaced with a new diaphragm or ○-ring.
8. Detailed View inside the main valve seat, such as whether there is damage to the core axis, if other debris in the main valve inside keep it out.
9. In accordance with the reverse is the order of replacement parts would be a good combination of the main valve installed, pay attention to the phenomenon of blocking the valve can not have cards.
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