The correct detailed method of operating the valve, collect quickly! Application of plugging technology with pressure in the treatment of leakage outside the valve of power plant

The correct detailed method of operating the valve, collect quickly! Application of plugging technology with

pressure in the treatment of leakage outside the valve of power plant

Valve is in the fluid system, used to control the direction of the fluid, pressure, flow of the device is to pipe and equipment in the medium (liquid, gas, powder) flow or stop and can control the flow of the device, the valve is an important control component in the fluid delivery system.
Valve is in the fluid system, used to control the direction of the fluid, pressure, flow of the device is to pipe and equipment in the medium (liquid, gas, powder) flow or stop and can control the flow of the device, the valve is an important control component in the fluid delivery system.
Preparation before operation
Read the operation instructions carefully before operating the valve. Before operation, the flow direction of gas must be clear, and attention should be paid to checking the valve open and close sign. Check the appearance of the valve to see whether the valve is damp, if damp to dry treatment; If other problems are found, rectify them in a timely manner. If it is an electric valve that has been stopped for more than 3 months, check the clutch before starting, confirm the handle is in the manual position, and then check the insulation, steering and electrical circuit of the motor.
Correct operation of manual valves
Manual VALVES ARE WIDELY USED VALVES WHOSE HANDWHEEL OR HANDLE IS DESIGNED ACCORDING TO ORDINARY MANPOWER, TAKING INTO ACCOUNT the strength of the sealing surface and the necessary closing force. So you can’t use a long lever or a longboard hand to move the board. Some people are used to the use of plate hand, should pay strict attention to, open the valve should be forced to smooth, avoid too hard, resulting in open and close the valve, force should be smooth, not impact. Some impact opening and closing high pressure valve components have been considered this impact and the general valve can not be equal to the line.
When the valve is fully opened, the handwheel should be reversed a little, so that the thread between tight, so as not to loose damage. For OPEN STEM VALVES, REMEMBER THE STEM position when fully open and fully closed to avoid hitting the upper dead center when fully open. And easy to check whether the full closure is normal. If the valve does fall off, or the spool seal is embedded between the larger debris, the valve stem position will change when fully closed. Damage to valve sealing face or valve handwheel.
Valve open sign: ball valve, butterfly valve, plug valve stem top surface groove and channel parallel, indicating that the valve in the full open position; When THE STEM IS ROTATED 90¡ÃƒÂ£ LEFT OR RIGHT, THE groove IS PERPENDICULAR TO THE channel, indicating that the VALVE is in a fully CLOSED POSITION. Some ball valves, butterfly valves, plug valves to wrench and channel flat behavior open, vertical to close. The operation of three-way and four-way valves should be carried out according to the marks of opening, closing and reversing. The handle should be removed after operation.
Proper operation of safety valve
The safety valve has been tested and fixed before installation. When THE SAFETY VALVE RUNS FOR A long TIME, THE OPERATOR SHOULD PAY attention TO THE inspection of the safety valve. During the inspection, people should avoid the exit of the safety valve, check the lead seal of the safety valve, pull the safety valve with a wrench, open it once at an interval, remove dirt and check the flexibility of the safety valve.
Correct operation of traps
The trap is easily blocked by water fouling and other debris of the valve. When enabled, first open the flush valve, flush pipe. If there is a bypass pipe, the bypass valve can be opened for brief flushing. If there is no flush pipe or bypass pipe, remove the trap, open the cut off rinse, then close the cut off valve, install the trap, then open the cut off valve, start the trap.
Correct operation method of pressure reducing valve
Before opening the pressure reducing valve, open the bypass valve or flushing valve to clean the dirt in the pipeline. After the pipeline is washed clean, close the bypass valve and flushing valve, and then start the pressure reducing valve. Trap before some of the steam pressure reducing valve, and need to open, micro pressure reducing valve open again after the cut-off valve, cut-off valve to open before the pressure reducing valve, watch the pressure reducing valve and pressure gauge, adjust the relief valve adjusting screw, the valve after pressure to the expected value, then slowly open the shut-off valve after pressure reducing valve, valve after pressure correction, until satisfied. Secure the adjusting screws and cover the protective cap.
If the pressure reducing valve failure or repair, should first slowly open the bypass valve, while closing the valve before cutting off the valve, manual regulation of the bypass valve, so that the pressure after the valve is basically stable in the predetermined value, and then close the pressure reducing valve replacement or repair, and then return to normal.
Proper operation of check valves
In ORDER TO AVOID THE HIGH IMPACT FORCE FORMED AT THE MOMENT WHEN THE CHECK VALVE IS CLOSED, THE VALVE MUST BE CLOSED QUICKLY TO PREVENT THE formation OF a great BACKFLOW speed, which is the cause of the impact pressure when the valve is suddenly closed. Therefore, the closing speed of the valve should be correctly matched with the decay speed of the downstream medium.
If the velocity variation range of the downstream medium is large, the velocity of ** * is not enough to force the closure to stop stably. In this case, the motion of the closing part can be suppressed by a damper within a certain range of its action stroke. The fast vibration of the closing part will cause the movable part of the valve to wear out too fast, resulting in premature valve failure. If THE MEDIUM IS PULSATING, THE RAPID VIBRATION OF THE SHUTOFF IS ALSO CAUSED BY EXTREME MEDIUM DISTURBANCE. In this case, the check valve should be located where the medium disturbance is minimal.
Online leak sealing technology application in power plant outside the valve leakage treatment to pick to: this article through to the type of power plant outside the valve leakage carries on the summary analysis, and the reason for different leakage, pressure and valve is part of the structural characteristics, this paper introduces the use of online leak sealing technique of online leak part for valve operation.