The valve is in the fluid system, and the device for controlling the direction, pressure, and flow of the fluid is a device that makes the flow and stoppage of the medium (liquid, gas, powder) in the piping and the device and can control the flow. The valve is the fluid delivery system. The important control part in the. Preparation before operation Before operating the valve, read the operating instructions carefully. Before operating, be sure to know the flow of gas. Check valve opening and closing signs. Check the appearance of the valve to see if the valve is damp. If there is moisture, it should be dried. If there are other problems, it must be dealt with promptly and no operation is allowed. If the electric valve is deactivated for more than 3 months, check the clutch before starting. After confirming that the handle is in the manual position, check the insulation, steering and electrical wiring of the motor. The manual valve is the most widely used valve. Its hand wheel or handle is designed according to the common manpower, taking into account the strength of the sealing surface and the necessary closing force. Therefore, you cannot use long levers or long hands to move. Some people are accustomed to using wrenches and should pay strict attention. When opening the valve, it should be used with a firm force to avoid excessive force. This can cause the valve to open and close. The force should be steady and not impactable. Some parts of the high-pressure valve that have been impacted and opened have already taken into account this impact force and the general valve cannot wait for a certain amount of time. When the valve is fully open, the handwheel should be reversed a little to make the threads tight so as not to loosen the damage. For the stem valve, remember to position the stem when fully open and fully closed to avoid hitting the top dead center when fully open. And it is easy to check whether it is normal when closed. If the valve does not come off, or if more debris is inserted between the valve plug seals, the valve stem position will change when fully closed. Damage to valve sealing surface or valve handwheel. Valve opening sign: When the groove and the channel on the top surface of the ball valve, butterfly valve, and plug valve stem are parallel, it indicates that the valve is in the fully open position; When the valve stem rotates 90 degrees to the left or right. The groove is perpendicular to the channel, indicating that the valve is in the fully closed position. Some ball valves, butterfly valves, and plug valves are opened parallel to the wrench and the channel, and are closed vertically. The operation of the three-way and four-way valves shall be based on the markings of opening, closing and reversing. Remove the handle after the operation is complete. Safety valve operating method The safety valve passed the pressure test and constant pressure before installation. When the safety valve runs for a long time, the operator should pay attention to checking the safety valve. When checking, the person avoids the outlet of the safety valve, checks the seal of the safety valve, and manually opens the safety valve with a wrench, and opens it once at intervals. Drain dirt and verify the safety valve's flexibility. The correct operation of the trap Traps are valves that are easily clogged with water and other debris. When enabled, first open the flush valve and flush the pipe. With a bypass pipe, the bypass valve can be opened for a short flush. If there is no trap for the flush pipe and the bypass pipe, the trap can be removed. After the flush is opened, the shut-off valve is closed, the trap is installed, and then the shut-off valve is opened and the trap is activated. Correct operation of pressure reducing valve Before the relief valve is activated, the bypass valve or purge valve must be opened to clean dirt from the pipeline. After the pipeline has been flushed, close the bypass valve and purge valve, and then activate the pressure relief valve. Some steam pressure reducing valve has a steam trap before it needs to be opened first, and then the cut-off valve after the pressure reducing valve is slightly opened. Finally, the cut-off valve before the pressure reducing valve is opened, the pressure gauge before and after the pressure reducing valve is watched, and the pressure reducing valve is adjusted. Adjust the screw so that the pressure after the valve reaches a predetermined value, then slowly open the shut-off valve after the pressure relief valve, correct the pressure after the valve, until satisfied. Fix the adjustment screw and cover the protective cap. If the pressure reducing valve fails or needs repair, slowly open the bypass valve first, close the valve before closing the valve, and manually adjust the bypass valve manually so that the pressure after the pressure relief valve is basically stabilized at a predetermined value, and then close again. After the pressure relief valve is replaced or repaired, it will return to normal. Correct operation of check valve In order to avoid the excessively high impact force of the non-return valve closing moment, the valve must be closed quickly to prevent the formation of a great reverse speed, which is the reason for the impact pressure when the valve suddenly closes. Therefore, the closing speed of the valve should be correctly matched with the attenuation speed of the downstream medium. If the speed of the downstream medium varies widely, the minimum flow rate is insufficient to force the closure to stop stably. In this case, the movement of the closing member can be suppressed by a damper within a certain range of its stroke. Rapid vibration of the closure will cause the valve moving parts to wear too quickly, causing premature valve failure. If the medium is pulsating, the rapid vibration of the closure is also caused by extreme media disturbances. Where this is the case, the check valve should be located where the medium disturbance is minimal. Small Autoclave,Composite Material Autoclave,Composite Treatment Autoclave,Civil Use Autoclave JIANGSU OLYMSPAN THERMAL ENERGY EQUIPMENT CO.,LTD , https://www.compositesautoclave.com
Correct operation of manual valve
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