
有時我們過於繁忙或專注於其他事情,我們忘記了找出原因可以幫助解決問題。常見的單向閥的問題包括噪音(水錘),振動,反向流動,堅持,滲漏,缺少內部,部件磨損或損壞。不過值得一提,通常的真正原因是選用不合式工作原理止回閥。在這種情況下,問題是該應用選型,而不是止回閥。
兩個止回閥的最常見的問題是反流和水錘。在這兩種情況下,一個快速閉合閥是需要的。反向流動可能是昂貴的,尤其是如果它發生在一個泵的排出和泵旋轉後退。修理或更換泵的成本,再加上工廠停工,遠遠超過安裝正確的止回閥擺在首位的成本。與水錘,你需要一個更快的閉止回閥,防止發生壓力衝擊和由此產生的衝擊波當蝶板砸向座位,發送噪音,振動和錘擊聲,可以破裂的管道和損壞設備和管道支架。
如果內部缺失或表現出磨損,有兩個因素可能發生。首先,如果選擇了單向閥不具有足夠的流量通過,以保持它對著它的停止,與較低KV/CV值的閥是需要防止的內部的移動/飄動。第二,如果單向閥是用在一個往復式空氣或氣體壓縮機的排出,需要用一個阻尼設計或緩衝器來處理高頻循環的閥。
粘性可能出現污垢被困蝶板和閥體孔之間。洩漏可能發生的損壞金屬閥座或蝶板,具彈性體的軟密封材料是必要的,以防止零洩漏。
Sometimes we get so busy or absorbed in other things, we forget that the cause can help with the solution. Common check valve problems include noise (water hammer), vibration, reverse flow, sticking, leakage, missing internals, component wear, or damage. However, it is worth mentioning that normally the real cause is the wrong style check valve for the application. In such cases, the problem is the application, not the check valve.
Two of the most common problems with check valves are reverse flow and water hammer. In both situations, a fast-closing valve is desired. Reverse flow can be costly, especially if it occurs at the discharge of a pump and the pump spins backwards. The cost to repair or replace the pump, plus the plant downtime, far exceeds the cost of installing the right check valve in the first place. With water hammer, you need a faster-closing check valve to prevent pressure surges and the resulting shock waves that occur when the disc slams into the seat, sending noise, vibration, and hammering sounds that can rupture pipelines and damage equipment and pipe supports.
If the internals are missing or exhibiting wear, two factors may be occurring. First, if the check valve selected does not have enough flow passing through to keep it against its stop, a valve with a lower Cv is needed to prevent the moving/fluttering of the internals. Second, if the check valve is used at the discharge of a reciprocating air or gas compressor, a valve with a damped design or dashpot to handle high-frequency cycling is needed.
Sticking can occur when scale or dirt is trapped between the disc and body bore. Leakage can happen from damage to the seat or disc or simple trash in the line. An elastomer is needed to provide zero leakage.
