Classification, characteristics, maintenance and r

Classification, characteristics, maintenance and repair of hydraulic control valve

hydraulic control valve is a valve whose water indicator light should be on and controlled. It consists of a main valve and its attached conduit, pilot valve, needle valve, ball valve and pressure gauge. According to the different purposes, functions and places of use, it can be evolved into remote control ball valve, pressure reducing valve, slow closing check valve, flow control valve, pressure relief valve, hydraulic electric control valve, water pump control valve, etc

the hydraulic control valve can be divided into diaphragm type and piston type according to its structure. The working principle is the same. Both of them are powered by the pressure difference △ p between the upper and lower reaches, controlled by the pilot valve, so that the diaphragm (piston) hydraulic differential operation is completely automatically adjusted by hydraulic power, so that the main valve disc is fully opened or closed or in the adjustment state. When the pressure water entering the control room above the diaphragm (piston) is discharged to the atmosphere or the downstream low-pressure area, the pressure acting on the bottom of the valve disc and below the diaphragm is greater than the pressure above, so push the main valve disc to the fully open position; When the pressure water entering the control room above the diaphragm (piston) cannot be discharged to the atmosphere or the downstream low-pressure area, the pressure value acting on the diaphragm (piston) above is greater than the pressure value below, so the main valve disc will be pressed to the fully closed position; When the pressure value in the control room above the diaphragm (piston) is between the inlet pressure and the outlet pressure, the main valve disc is in the regulating state, and its regulating position depends on the joint control effect of the needle valve and the adjustable pilot valve in the conduit system. The adjustable pilot valve can open or close its own small valve port through the downstream outlet pressure and with its change, so as to change the pressure value of the control room above the diaphragm (piston) and control the adjustment position of the square valve disc

repair and maintenance of hydraulic control valve

hydraulic control valve is a water self-lubricating valve body, which does not need additional oil lubrication. In case of damage to parts in the main valve, please disassemble it according to the following instructions. (Note: in addition, Mo strengthens the matrix while strengthening the carbide. Generally, the damaged products consumed in the valve are diaphragm and O-ring, and other internal parts are rarely damaged)

1 Close the front and rear gate valves of the main valve first

2. Loosen the pipe joint screw on the main valve cover to release the pressure in the valve

3. Remove all screws, including the nuts of necessary copper pipes in the control pipeline

4. Remove the valve cover and spring

5. Remove the shaft core, diaphragm, piston, etc., and do not damage the diaphragm

6. After taking out the above items, check whether the diaphragm and O-ring are damaged; If there is no damage, please do not compete for its internal parts by yourself

7. If the diaphragm or O-ring is found to be damaged, loosen the nut on the shaft core, disassemble the diaphragm or O-ring one by one, and replace it with a new diaphragm or O-ring after taking it out

8. Check whether the valve seat and shaft core inside the main valve are damaged in detail. If there are other sundries inside the main valve, clean them out

9. Assemble the replaced parts and components into the main valve in the reverse order. Pay attention to the valve. 3. Look at the temperature. Whether the ambient temperature of the variable-frequency single column tensile testing machine is normal. It is required to be within the range of ⑴ 0 ℃ to 40 ℃, and it is better to be about 25 ℃; There can be jamming