Hydraulic control valve structure function and maintenance
Hydraulic control valve structure function and maintenance:
Hydraulic control valve is the valve of water pressure control, it is composed of a main valve and its attached conduit, guide valve, needle valve, ball valve and pressure gauge. According to the purpose, function and place of use, it can be evolved into 100X remote control float valve, pressure-reducing valve, slow-closing check valve, flow control valve, 100D fixed water level valve, hydraulic electric control valve, water pump control valve, etc.
Hydraulic control valve according to the structure can be divided into diaphragm type and piston type two, the same principle of work, is the downstream pressure difference of the above power, by guide valve control, diaphragm (piston) hydraulic differential operation, completely by hydraulic automatic regulation, so that the main valve disc completely open or completely closed or in the state of regulation. When the pressure water entering the control room above the diaphragm (piston) is discharged into the atmosphere or the lower pressure area downstream, the pressure value acting on the bottom of the disc and below the diaphragm is greater than the pressure value above, so the main valve disc is pushed to the fully open position; When the pressure water entering the control room above the diaphragm (piston) cannot be discharged into the atmosphere or the lower 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 completely 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 function of the needle valve and adjustable guide valve in the catheter system. Adjustable guide valve can be through the downstream outlet pressure and with its changes and open or close its own small valve mouth, thereby changing the pressure value of the control room above the diaphragm (piston), control side valve disc adjustment position.
Repair and maintenance of hydraulic control valve
Hydraulic control valve is a kind of valve body that USES water to lubricate itself without oil lubrication. In case of damage to parts in the main valve, please disassemble according to the following instructions. (note: the damaged products consumed in the internal valve are generally diaphragm and type ring, with little damage to other internal parts)
1. Close the front and rear gate valves of the main valve first.
2. Loosen the adapter screw on the main valve cover to release the pressure inside the valve.
3. Remove all screws, including the nuts of the necessary copper pipe in the control line.
4. Remove cover and spring.
5. Remove the spindle, diaphragm and piston, and do not damage the diaphragm.
6. After taking out the above items, check whether the diaphragm and type ring are damaged; If there is no damage, please do not compete for its internal parts.
7. If the diaphragm or type ring is found damaged, please loosen the nut on the shaft core, disassemble the diaphragm or type ring by zhejiang, and replace the diaphragm or type ring with a new one after taking it out.
8. Inspect the valve seat, shaft core, etc. inside the main valve in detail, and clean them out if there are other sundries inside the main valve.
9. According to the reverse is to replace the parts after the assembly of the main valve, pay attention to the valve can not have the phenomenon of stuck resistance.
Hydraulic control valve is the valve of water pressure control, it is composed of a main valve and its attached conduit, guide valve, needle valve, ball valve and pressure gauge.
The use of hydraulic control valve, the first to pay attention to the selection. Improper selection will cause water resistance and air leakage. When selecting hydraulic control valve, it is necessary to select the displacement of hydraulic control valve by multiplying the steam consumption per hour of the equipment by the selection ratio of 2-3 times the condensation water of Z. In order to ensure that the hydraulic control valve can discharge the condensate as soon as possible when driving, quickly increase the temperature of heating equipment. Hydraulic control valve discharge energy is not enough, will cause the condensate can not be discharged in time, reduce the thermal efficiency of heating equipment.
When selecting hydraulic control valve, can not choose hydraulic control valve with nominal pressure, because the nominal pressure can only represent hydraulic control valve shell bearing pressure class, hydraulic control valve nominal pressure and work pressure is very different, so according to the working pressure difference to choose hydraulic control valve displacement. Working pressure difference refers to the hydraulic control valve before the working pressure minus hydraulic control valve outlet back pressure difference.
The choice of hydraulic control valve requires accurate steam drainage, high sensitivity, can improve the utilization rate of steam, no leakage of steam, reliable performance, high back pressure ratio, long service life, convenient maintenance is an important condition.