閥門(mén)關(guān)不嚴(yán)的原因主要有下面4種情況：

There are four main reasons for the valve not closing tightly:

1. 有雜質(zhì)粘在密封面上，碎屑沉積在閥底部或閥瓣與閥座之間。

1. Impurities stick to the sealing surface, and debris deposits at the bottom of the valve or between the valve disc and valve seat.

2. 所用介質(zhì)有結(jié)晶現(xiàn)象。

2. The medium used has crystallization phenomenon.

3. 閥門(mén)密封面損壞，造成介質(zhì)泄漏。

3. The sealing surface of the valve is damaged, causing medium leakage.

4. 閥桿與閥瓣連接不好，使閥瓣與閥座歪斜，不能緊密接觸。

4. Poor connection between the valve stem and valve disc, causing the valve disc and valve seat to be skewed and unable to make close contact.

閥門(mén)關(guān)閉不嚴(yán)的解決辦法法：

Solution for loose valve closure:

1. 雜質(zhì)卡在閥門(mén)密封面：有時(shí)閥門(mén)突然關(guān)不緊。可能是雜質(zhì)卡在閥門(mén)密封面之間。這個(gè)時(shí)候，你不應(yīng)該強(qiáng)迫它關(guān)閉。你應(yīng)該把閥門(mén)開(kāi)得稍微大一點(diǎn)，然后再把它關(guān)起來(lái)。反復(fù)嘗試，通常是可以消除的。否則，你應(yīng)該再次檢查。培養(yǎng)基的質(zhì)量也要保持清潔。

1. Impurities getting stuck on the valve sealing surface: Sometimes the valve suddenly cannot close tightly. It is possible that impurities are stuck between the valve sealing surfaces. At this point, you should not force it to close. You should open the valve slightly larger and then close it. Repeated attempts can usually be eliminated. Otherwise, you should check again. The quality of the culture medium should also be kept clean.

2. 閥桿螺紋生銹：當(dāng)閥門(mén)通常處于開(kāi)啟狀態(tài)，意外關(guān)閉時(shí)，閥桿螺紋可能生銹，可能無(wú)法緊密關(guān)閉。這種情況下，通過(guò)多次反復(fù)啟閉閥門(mén)就可以使閥門(mén)緊密關(guān)閉，而不需要對(duì)閥門(mén)進(jìn)行研磨或修理。

2. Rust on valve stem threads: When the valve is usually in an open state and accidentally closed, the valve stem threads may rust and may not be able to close tightly. In this case, the valve can be tightly closed by repeatedly opening and closing it, without the need for grinding or repairing the valve.

3. 閥門(mén)密封面損壞：如果多次嘗試仍不能?chē)?yán)密關(guān)閉閥門(mén)，說(shuō)明密封面損壞，或腐蝕、被介質(zhì)中的顆粒劃傷等，應(yīng)報(bào)修。

3. Damaged valve sealing surface: If the valve cannot be tightly closed after multiple attempts, it indicates that the sealing surface is damaged, corroded, or scratched by particles in the medium, and should be reported for repair.

4. 閥桿與閥瓣之間的連接不好：遇到這種情況，需要在閥桿和閥桿螺母上加潤(rùn)滑油，以保證閥門(mén)啟閉靈活。應(yīng)該有一個(gè)正式的維修計(jì)劃，加強(qiáng)對(duì)閥門(mén)的維修。

4. Poor connection between valve stem and valve disc: In this situation, lubricating oil needs to be added to the valve stem and valve stem nut to ensure flexible opening and closing of the valve. There should be a formal maintenance plan to strengthen valve maintenance.