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.開關手動閥：

1、 Switch the manual valve:

手動閥是使用廣泛的閥門，其手輪或手柄是根據普通人力設計的，考慮到密封面的強度和必要的關閉力。因此，不能使用長杠桿或長板手來移動。有些人習慣使用板手，應該嚴格注意，不要太用力，否則很容易損壞密封面，或者板斷裂手輪.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.

打開和關閉良工閥門，力應穩定，無沖擊。一些高壓閥門的部件已經考慮到了這種沖擊力和一般閥門不能等待岡。

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.

對于蒸汽閥，開啟前應提前加熱，并排除凝結水，開啟時應盡量緩慢，避免水擊。

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.

當閥門完全打開時，手輪應稍微倒轉，擰緊螺紋，以避免松動和損壞。對于明確的桿閥，請記住閥桿的位置，以避免在完全打開時撞擊死點。并便于檢查完全關閉時是否正常。如果閥處脫落，或閥芯密封間嵌入大雜物，則在完全關閉時改變閥桿位置。

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.

管道初次使用時，內部污垢較多。良工閥門可以微啟，介質的高速流動可以沖走，然后輕輕關閉(不能快速關閉.猛閉，防止殘留雜質夾傷密封面)，再次打開，重復多次，沖洗污垢，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.

經常打開閥門，密封面上可能有污垢，關閉時用上述方法沖洗干凈，然后正式關閉。

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.

良工閥門

Lianggong valve

如手輪.如果手柄損壞或丟失，應立即配齊，不得用活絡板手代替，以免損壞閥桿四方，開閉不靈，導致生產中發生事故。

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.

部分介質在手動閥關閉后冷卻，使閥件收縮，操作人員應在適當的時間再次關閉，使密封面無細縫，否則介質從細縫高速流動，容易侵蝕密封面。

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.

操作過程中，如果發現操作過于困難，應分析原因。如果填料太緊，可以適當放松。如果閥桿傾斜，應通知人員進行維修。有些閥門在關閉狀態下加熱膨脹，難以打開；如果此時必須打開，可以將閥蓋螺紋擰松半圈到一圈，消除閥桿應力，然后移動手輪。

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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