The manual valve is a control part in the pipeline fluid transmission system, which is used to change the flow direction of the road section and the medium, stop, adjust, throttle, check, divert or overflow pressure relief functions. For fluid control valve, the nominal diameter of Lianggong valve ranges from very small instrument valve to industrial pipeline valve with diameter of 10m.

一.开关手动阀：

1、 Switch the manual valve:

手动阀是使用广泛的阀门，其手轮或手柄是根据普通人力设计的，考虑到密封面的强度和必要的关闭力。因此，不能使用长杠杆或长板手来移动。有些人习惯使用板手，应该严格注意，不要太用力，否则很容易损坏密封面，或者板断裂手轮.手柄。

Manual valve is a widely used valve. Its handwheel or handle is designed according to ordinary manpower, taking into account the strength of the sealing surface and the necessary closing force. Therefore, it is not allowed to use a long lever or a long wrench to move. Some people are used to using the wrench, so they should be careful not to use too much force, otherwise it is easy to damage the sealing surface, or the plate will break the handwheel and handle.

打开和关闭良工阀门，力应稳定，无冲击。一些高压阀门的部件已经考虑到了这种冲击力和一般阀门不能等待冈。

Open and close Lianggong valve with stable force and no impact. Some parts of high-pressure valves have taken into account the impact force and the general valve cannot wait.

对于蒸汽阀，开启前应提前加热，并排除凝结水，开启时应尽量缓慢，避免水击。

For the steam valve, it should be heated in advance before opening, and the condensate should be discharged. When opening, it should be as slow as possible to avoid water hammer.

当阀门完全打开时，手轮应稍微倒转，拧紧螺纹，以避免松动和损坏。对于明确的杆阀，请记住阀杆的位置，以避免在完全打开时撞击死点。并便于检查完全关闭时是否正常。如果阀处脱落，或阀芯密封间嵌入大杂物，则在完全关闭时改变阀杆位置。

When the valve is fully opened, the handwheel should be slightly reversed and the thread tightened to avoid loosening and damage. For specific stem valves, please remember the position of the valve stem to avoid hitting the dead center when fully open. It is convenient to check whether it is normal when it is completely closed. If the valve falls off or large sundries are embedded between the valve core seals, change the valve stem position when it is fully closed.

管道初次使用时，内部污垢较多。良工阀门可以微启，介质的高速流动可以冲走，然后轻轻关闭(不能快速关闭.猛闭，防止残留杂质夹伤密封面)，再次打开，重复多次，冲洗污垢，然后投入正常工作。

When the pipeline is used for the first time, there are many internal dirt. The Lianggong valve can be slightly opened, and the high-speed flow of the medium can be washed away, and then slightly closed (it cannot be closed quickly or violently to prevent the residual impurities from pinching the sealing surface), and then opened again, repeated for many times to wash the dirt, and then put into normal operation.

经常打开阀门，密封面上可能有污垢，关闭时用上述方法冲洗干净，然后正式关闭。

Open the valve frequently, and there may be dirt on the sealing surface. When closing, flush it with the above method, and then officially close it.

良工阀门

Lianggong valve

如手轮.如果手柄损坏或丢失，应立即配齐，不得用活络板手代替，以免损坏阀杆四方，开闭不灵，导致生产中发生事故。

For example, if the handle is damaged or lost, it should be prepared immediately. It is not allowed to use the flexible wrench to replace it, so as to avoid damage to the valve stem square and inflexible opening and closing, leading to accidents in production.

部分介质在手动阀关闭后冷却，使阀件收缩，操作人员应在适当的时间再次关闭，使密封面无细缝，否则介质从细缝高速流动，容易侵蚀密封面。

Part of the medium cools down after the manual valve is closed to make the valve shrink. The operator should close it again at an appropriate time to make the sealing surface free of fine seams. Otherwise, the medium flows from the fine seams at high speed and is easy to erode the sealing surface.

操作过程中，如果发现操作过于困难，应分析原因。如果填料太紧，可以适当放松。如果阀杆倾斜，应通知人员进行维修。有些阀门在关闭状态下加热膨胀，难以打开；如果此时必须打开，可以将阀盖螺纹拧松半圈到一圈，阀杆应力，然后移动手轮。

During the operation, if the operation is found to be too difficult, the cause shall be analyzed. If the packing is too tight, it can be properly loosened. If the valve stem is inclined, notify the personnel for maintenance. Some valves are difficult to open due to heating expansion under closed state; If the valve must be opened at this time, loosen the bonnet thread by half a turn to one turn to relieve the stress on the valve stem, and then move the handwheel.

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