A valve is a device used in a fluid system to control the direction, pressure, and flow of fluids. It is a device that enables the flow of medium (liquid, gas, powder) in the distribution and preparation, or stops and controls its flow rate. Valves are important control components in fluid transportation systems.

Preparation before installation

Before presenting it as a broad door, one should carefully read the explanation. Before work, it is necessary to be clear about the direction of gas flow and pay attention to checking the wide door opening and closing signs. Check the appearance of the valve to see if the wide door is damp. If it is affected by a lake, dry explosion treatment should be carried out. If other problems are found, they should be dealt with in a timely manner, and no unauthorized operation is allowed. If it is an electric wide door that has been out of use for more than 3 months, the clutch should be checked before starting, and after confirming that the handle is in the manual position, the insulation, steering, and electrical circuits of the motor should be checked.

The correct operation method for manual valves

Manual feeding gate is the most widely used feeding gate, and its handwheel or handle is designed according to ordinary human labor, taking into account the strength of the sealing drawing and the necessary closing force. Therefore, it cannot be operated with a long machine rod or a long wrench. Some people are accustomed to using a wrench, and strict attention should be paid. When opening the wide gate, force should be stable to avoid excessive force, which may cause the opening of the net gate. The work should be smooth and not impact, Some components of high-voltage doors that open and close with a medium impact have been tested, and this medium impact force cannot be compared to ordinary smoke doors

When the valve is fully open, the handwheel should be turned back a little to tighten the threads tightly to avoid loosening and damage. For open stem valves, remember the positions of the two rods when fully open and fully closed to avoid hitting the dead center when fully open. And it is convenient to check whether it is normal when fully closed. If the valve stem falls off or there are large debris embedded between the wide core seals, the position of the wide rod will change when fully closed. Damage to valve sealing surface or valve handwheel. When the groove on the top surface of the valve stem of ball valves, butterfly valves, and plug valves is parallel to the channel, it indicates that the valve is in the fully open position when the net rod rotates 90 degrees to the left or right. When the groove and channel are straight, it indicates that the valve is in the fully closed position. Some ball valves, butterfly valves, and plug valves are opened when the wrench is parallel to the channel, and closed when it is vertical. The operation of three-way and four-way valves should follow the markings for opening, closing, and reversing. After the operation is completed, the movable handle should be removed.

The correct operation method for check valves

In order to avoid the excessive high pressure generated by the moment the check net is closed, the valve must close quickly to prevent the formation of a huge backflow velocity, which is the cause of the impact pressure in the shape when the wide door suddenly closes. Therefore. The closing degree of the smoke door should be correctly matched with the attenuation speed of the downstream medium.

If the speed variation range of the downstream medium is large, a small flow velocity is not enough to force the closing element to stop stably. In this case, the movement of the closing element can be suppressed by a damper within a certain range of its action stroke. The rapid vibration of the closing component can cause excessive wear and tear on the wide door, leading to premature failure of the door. If the flow is pulsating, the rapid vibration caused by the closure is also caused by extreme medium disturbance. In all cases where there is a fluctuation, the upper return lake should be placed in the area with the least medium disturbance.

Correct operation method of safety valve

Before installation, safety has undergone pressure testing and constant pressure. When the safety adjustment runs for a long time, the operator should pay attention to checking the safety regulations. During the inspection, avoid the safety adjustment outlet, check the aluminum seal of the safety smoke, manually lift the safety valve net with a wrench, and open it at intervals to remove dirt and verify the flexibility of the safety valve.

Correct operation method of pressure reducing valve

Before using the pressure reducing valve, the bypass feeding or intermediate washing valve should be opened, and the first injection should be swept. After the channel is cleaned, the bypass network and intermediate washing valve should be closed, and then the pressure reducing valve should be activated. Some steam pressure reducing lakes have a yard water valve in front of them, which needs to be opened first, and then the cut-off valve after the pressure reducing smoke needs to be slightly opened. Finally, the cut-off valve before the pressure reducing feeding should be opened twice, and the pressure gauge before and after the pressure reducing valve should be checked. Adjust the pressure regulating screw of the pressure reducing lake to reach the specified value after the net, Immediately slowly open the shut-off valve behind the pressure reducing lake, correct the pressure after reading, until satisfied. Secure the adjustment screw and cover the protective cap.

If the pressure reducing valve malfunctions or needs to be repaired, the bypass valve should be slowly opened first, and the cut-off valve in front of the network should be closed. The bypass valve should be manually adjusted roughly to stabilize the pressure behind the pressure reducing lake at the predetermined value. Then, the pressure reducing network should be closed for replacement or repair before returning to normal.

The correct operation method for hydrophobic width

Xiaoshui valve is a door that is easily blocked by water pollution and other debris. When activated, first open the flushing valve and flushing channel. If there is a bypass pipe, the bypass can be opened for a brief intermediate cleaning. For Xiaoshui valves without intermediate washing pipes and bypass pipes, the drain valve can be removed. After opening the cut-off flushing, close the cut-off valve, install the drain valve, and then open the cut-off valve to activate the drain valve.