Brass valve is a device used to control the direction, pressure and flow of fluid in a fluid system. It is a device that makes the medium (liquid, gas, powder) in the piping and equipment flow or stop and can control its flow. Brass valve It is an important control component in the fluid delivery system.

Correct operation and use methods have a great influence on the performance and life of brass valves. Today we will learn about the operation and use methods of different brass valves.

 The operating instructions should be read carefully before operating a brass valve. Before operation, the flow direction of the gas must be clear, and attention should be paid to check the opening and closing signs of the brass valve. Check the appearance of the brass valve to see if the brass valve is damp. If it is damp, it should be dried; if any other problems are found, they should be dealt with in time, and no faulty operation is allowed. If it is an electric brass valve that has been out of use for more than 3 months, check the clutch before starting, confirm that the handle is in the manual position, and then check the insulation, steering and electrical wiring of the motor.

 

Manual brass valve is the most widely used brass valve (such as brass ball valve, brass gate valve, brass angle valve, brass check valve, brass safety valve, etc.), and its handwheel or handle is in accordance with ordinary It is designed by manpower, considering the strength of the sealing surface and the necessary closing force. Therefore, it is not possible to use a long lever or a long wrench to move the board. Some people are accustomed to using a wrench, and they should pay strict attention to the steady force when opening the brass valve to avoid excessive force, which will cause the brass valve to be opened and closed. The force should be stable and not impacted. Some components of high-pressure brass valves that are opened and closed by impact have taken into account the impact force that cannot be equal to that of general brass valves.

 

When the brass valve is fully opened, the handwheel should be turned upside down a little to make the threads tight to avoid loosening and damage. For rising stem brass valves, remember the stem position when fully open and fully closed to avoid hitting the top dead center when fully open. And it is convenient to check whether it is normal when fully closed. If the valve does fall off, or if there is a large debris embedded between the valve core seals, the position of the valve stem will change when it is fully closed. Damage to brass valve sealing surfaces or brass valve handwheel.

 

Brass valve opening sign: When the groove on the top surface of the brass ball valve, butterfly valve, and plug valve stem is parallel to the channel, it indicates that the brass valve is in the fully open position; when the valve stem is rotated 90 to the left or right. , the groove is perpendicular to the channel, indicating that the brass valve is in the fully closed position. Some brass ball valves, butterfly valves and plug valves are opened with a wrench parallel to the channel, and closed vertically. The operation of the three-way and four-way brass valves should be carried out according to the marks of opening, closing and reversing. After the operation is completed, the movable handle should be removed.

The brass safety valve has undergone pressure test and constant pressure before installation. When the brass safety valve runs for a long time, the operator should pay attention to checking the brass safety valve. During the inspection, people should avoid the outlet of the brass safety valve, check the lead seal of the brass safety valve, lift the safety valve with a wrench by hand, and open it at intervals. Remove dirt and verify the flexibility of the brass safety valve.

Brass gate valves are brass valves that are easily blocked by water and other debris. When enabled, first open the flush valve and flush the pipeline. If there is a bypass pipe, the bypass valve can be opened for a short flush. For brass gate valves without flushing pipes and bypass pipes, the brass gate valvescan be removed, and after opening the shut-off and flushing, close the shut-off valve, install the trap, and then open the shut-off valve to activate the brass gate valves.

Before the pressure reducing valve is activated, the bypass valve or flushing valve should be opened to clean the dirt in the pipeline. After the pipeline is flushed, the bypass valve and the flushing valve should be closed, and then the pressure reducing valve should be activated. Some steam pressure reducing valves have traps in front of them, which need to be opened first, then slightly open the shut-off valve behind the pressure reducing valve, and finally open the shut-off valve in front of the pressure reducing valve, watch the pressure gauges before and after the pressure reducing valve, and adjust the pressure reducing valve. Adjust the screw to make the pressure behind the valve reach the predetermined value, then slowly open the shut-off valve behind the pressure reducing valve, and correct the pressure behind the valve until it is satisfied. Fix the adjusting screw and cover the protective cap.

 

If the pressure reducing valve fails or needs to be repaired, the bypass valve should be opened slowly first, and the shut-off valve in front of the valve should be closed at the same time, and the bypass valve should be roughly adjusted manually so that the pressure after the pressure reducing valve is basically stable at the predetermined value, and then closed. After the pressure reducing valve is replaced or repaired, it will return to normal.

In order to avoid the high impact force formed when the check valve is closed, the brass valve must be closed quickly, so as to prevent the formation of a great reverse flow rate, which is the reason for the impact pressure when the brass valve is suddenly closed. Therefore, the closing speed of the brass valve should be correctly matched with the decay speed of the downstream medium.

 

If the velocity of the co-current medium varies widely, the minimum flow rate is not sufficient to force the closure to stop steadily. In this case, the movement of the closure member can be damped within a certain range of its stroke by means of a damper. Rapid vibration of the closing member will cause the brass valve moving parts to wear out too quickly, resulting in premature brass valve failure. If the medium is a pulsating flow, the rapid vibration of the closing element is also caused by extreme medium disturbance. Where this is the case, the check valve should be placed where the medium disturbance is minimal.

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