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Correct operation of the valve on the detailed method, it is worth collecting!
Valve is in the fluid system, used to control the direction of the fluid, pressure, flow device is to make piping and equipment in the medium (liquid, gas, powder) flow or stop and can control its flow device, valve is an important control part of the fluid conveying system.
Preparation before operation
Read instructions carefully before operating the valve.
Be sure to clear the flow of gas before operation, and pay attention to check the valve opening and closing marks.
Check the valve appearance to see whether the valve is damp, if there is damp to be dry treatment;
If other problems are found, they should be dealt with in a timely manner. No fault operation is allowed.
In the case of an electric valve that has been out of service for more than 3 months, check the clutch before starting and make sure the handle is in the manual position before checking the insulation, steering and electrical wiring of the motor.
Correct operation of manual valve
The manual valve is the most widely used valve, and its handwheel or handle is designed according to ordinary manpower, considering the strength of the sealing surface and the necessary closing force.
Therefore, the board cannot be moved with a long lever or a long wrench.
Some people are used to using the wrench, should strictly pay attention to, open the valve should be forced to smooth, avoid excessive force, resulting in the opening and closing of the valve, the force should be smooth, not impact.
Some impact opening and closing of the high pressure valve components have considered this impact and the general valve can not wait.
When the valve is fully open, the handwheel should be inverted a little, so that the thread between the tight, so as not to loose damage.
For open stem valves, remember the fully open and fully closed stem position to avoid hitting the top dead point in full open.
And to check whether it is normal when the whole closed.
If valve does fall off, or interpose between valve core sealing bigger sundry, the valve lever position when closing completely is about to change.
Damage to valve sealing surface or valve handwheel.
Valve opening mark: when the groove on the top of the stem of ball valve, butterfly valve and plug valve is parallel to the channel, it indicates that the valve is in full open position;
Turn stem 90 to 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.
Three-way and four-way valves shall be operated according to the marks of opening, closing and reversing.
Remove the movable handle after operation.
Proper operation of the relief valve
The relief valve is tested for pressure and fixed pressure before installation.
When the safety valve runs for a long time, the operator should pay attention to check the safety valve. During the inspection, the operator should avoid the outlet of the safety valve, check the lead seal of the safety valve, and manually pull the safety valve with a spanner. The valve should be opened once every period of time to discharge the dirt and check the flexibility of the safety valve.
Correct operation of trap
Steam trap is easy to be water and other debris blocked valve.
When enabled, first open the flush valve, flush the pipeline.
If there is bypass pipe, the bypass valve can be opened for short flushing.
If there is no flushing pipe or bypass pipe trap, remove the trap, open the shut-off rinse, and then close the shut-off valve, install the shut-off valve, and then open the shut-off valve to enable the trap.
Correct operation of pressure relief valve
Before opening the pressure reducing valve, the bypass valve or flush valve should be opened to clean up the dirt in the pipe. After the pipe is cleaned, the bypass valve and flush valve should be closed and then the pressure reducing valve should be opened.
Before some of the steam pressure reducing valve, trap needs to open, then slightly open the cut-off valve after pressure reducing valve, finally the pressure reducing valve before the cut-off valve open, 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.
Fix the adjusting screw and cover the protective cap.
Such as
If the valve fault or repair, should first slowly open the bypass valve, at the same time close the valve before the cut off valve, manual adjustment bypass valve, the pressure of the valve after the basic stability in the predetermined value above and below, and then close the valve replacement or repair, and then restore to normal.
Correct operation of check valves
In order to avoid the excessive impact force generated by the instantaneous closing of the check valve, the valve must be closed quickly to prevent the formation of extreme reverse flow velocity, which is the cause of impact pressure when the valve is suddenly closed.
Therefore, the valve should be closed speed and downstream media attenuation speed of the correct match.
If the velocity of the downstream medium varies widely, the minimum velocity will not be sufficient to force the closure to stop stably.
In this case, the motion of the closing member can be restrained by a damper within a certain range of its motion stroke.
The quick vibration of the closing part will make the moving part of the valve wear out too fast, resulting in premature failure of the valve.
If the medium is a pulsating flow, the rapid vibration of the shutoff is also caused by extreme dielectric disturbance. Where such a situation exists, the check valve should be positioned where the dielectric disturbance is least.
Preparation before operation
Read instructions carefully before operating the valve.
Be sure to clear the flow of gas before operation, and pay attention to check the valve opening and closing marks.
Check the valve appearance to see whether the valve is damp, if there is damp to be dry treatment;
If other problems are found, they should be dealt with in a timely manner. No fault operation is allowed.
In the case of an electric valve that has been out of service for more than 3 months, check the clutch before starting and make sure the handle is in the manual position before checking the insulation, steering and electrical wiring of the motor.
Correct operation of manual valve
The manual valve is the most widely used valve, and its handwheel or handle is designed according to ordinary manpower, considering the strength of the sealing surface and the necessary closing force.
Therefore, the board cannot be moved with a long lever or a long wrench.
Some people are used to using the wrench, should strictly pay attention to, open the valve should be forced to smooth, avoid excessive force, resulting in the opening and closing of the valve, the force should be smooth, not impact.
Some impact opening and closing of the high pressure valve components have considered this impact and the general valve can not wait.
When the valve is fully open, the handwheel should be inverted a little, so that the thread between the tight, so as not to loose damage.
For open stem valves, remember the fully open and fully closed stem position to avoid hitting the top dead point in full open.
And to check whether it is normal when the whole closed.
If valve does fall off, or interpose between valve core sealing bigger sundry, the valve lever position when closing completely is about to change.
Damage to valve sealing surface or valve handwheel.
Valve opening mark: when the groove on the top of the stem of ball valve, butterfly valve and plug valve is parallel to the channel, it indicates that the valve is in full open position;
Turn stem 90 to 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.
Three-way and four-way valves shall be operated according to the marks of opening, closing and reversing.
Remove the movable handle after operation.
Proper operation of the relief valve
The relief valve is tested for pressure and fixed pressure before installation.
When the safety valve runs for a long time, the operator should pay attention to check the safety valve. During the inspection, the operator should avoid the outlet of the safety valve, check the lead seal of the safety valve, and manually pull the safety valve with a spanner. The valve should be opened once every period of time to discharge the dirt and check the flexibility of the safety valve.
Correct operation of trap
Steam trap is easy to be water and other debris blocked valve.
When enabled, first open the flush valve, flush the pipeline.
If there is bypass pipe, the bypass valve can be opened for short flushing.
If there is no flushing pipe or bypass pipe trap, remove the trap, open the shut-off rinse, and then close the shut-off valve, install the shut-off valve, and then open the shut-off valve to enable the trap.
Correct operation of pressure relief valve
Before opening the pressure reducing valve, the bypass valve or flush valve should be opened to clean up the dirt in the pipe. After the pipe is cleaned, the bypass valve and flush valve should be closed and then the pressure reducing valve should be opened.
Before some of the steam pressure reducing valve, trap needs to open, then slightly open the cut-off valve after pressure reducing valve, finally the pressure reducing valve before the cut-off valve open, 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.
Fix the adjusting screw and cover the protective cap.
Such as
If the valve fault or repair, should first slowly open the bypass valve, at the same time close the valve before the cut off valve, manual adjustment bypass valve, the pressure of the valve after the basic stability in the predetermined value above and below, and then close the valve replacement or repair, and then restore to normal.
Correct operation of check valves
In order to avoid the excessive impact force generated by the instantaneous closing of the check valve, the valve must be closed quickly to prevent the formation of extreme reverse flow velocity, which is the cause of impact pressure when the valve is suddenly closed.
Therefore, the valve should be closed speed and downstream media attenuation speed of the correct match.
If the velocity of the downstream medium varies widely, the minimum velocity will not be sufficient to force the closure to stop stably.
In this case, the motion of the closing member can be restrained by a damper within a certain range of its motion stroke.
The quick vibration of the closing part will make the moving part of the valve wear out too fast, resulting in premature failure of the valve.
If the medium is a pulsating flow, the rapid vibration of the shutoff is also caused by extreme dielectric disturbance. Where such a situation exists, the check valve should be positioned where the dielectric disturbance is least.
