威格士溢流閥@VICKERS電磁換向閥
威格士Vickers遠控溢流閥的球體是固定的,受壓后不產(chǎn)生移動。固定球球閥都帶有浮動閥座,受介質(zhì)壓力后,閥座產(chǎn)生移動,使密封圈緊壓在球體上,以保證密封。通常在與球體的上、下軸上裝有軸承,操作扭距小,適用于高壓和大口徑的閥門。為了減少球閥的操作扭矩和增加密封的可靠程度,近年來又出現(xiàn)了油封球閥,既在密封面間壓注特制的潤滑油,以形成一層油膜,即增強了密封性,又減少了操作扭矩,更適用高壓大口徑的球閥。VICKERS溢流閥JVD1繼續(xù)保持開啟狀態(tài)。當壓力下降至0.5MPa時,電接點壓力表B1常閉觸點恢復導通狀態(tài),從而使中間繼電器KA1吸合,常閉觸點斷開,使繼電器KAI斷電,釋放常開觸點使其處于斷開狀態(tài),從而使電磁閥JVD1斷電并恢復到原始狀態(tài),接口P關(guān)閉,A與O相通,使卸荷器及管路中的壓縮空氣通過A一O一旋塞逸人大氣,卸荷器停止工作,空壓機返回到正常工作(加載)狀態(tài)。從0.55MPa卸荷到0.5MPa加載的過程同壓力控制閥的工作行程相似,從而解決了單一電信號引起系統(tǒng)頻繁動作的難題。二、三級卸荷原理相同,區(qū)別在于所取壓力值不同。
威格士Vickers遠控溢流閥亦稱自力式平衡閥、流量調(diào)節(jié)閥、流量控制器、動態(tài)平衡閥、流量平衡閥,是一種直觀簡便的流量調(diào)節(jié)控制裝置,管網(wǎng)中應(yīng)用流量控制閥可直接根據(jù)設(shè)計來設(shè)定流量,閥門可在水作用下,自動消除管線的剩余壓頭及壓力波動所引起的流量偏差,無論系統(tǒng)壓力怎樣變化均保持設(shè)定流量不變,該閥這些功能使管網(wǎng)流量調(diào)節(jié)一次完成,把調(diào)網(wǎng)工作變?yōu)楹唵蔚牧髁糠峙?,有效的解決管網(wǎng)的水力失調(diào)。流量控制閥主要應(yīng)用于:集中供熱(冷)等水系統(tǒng)中,使管網(wǎng)流量按需分配,消除水系統(tǒng)水力失調(diào),解決冷熱不均問題,可節(jié)能、節(jié)電15%-20%。變阻力設(shè)備,它們是以流體的差壓作為動力,并根據(jù)系統(tǒng)工況(差壓)變化,自動改變阻力系數(shù),保持流量閥和橫流量的恒定,通過恒定各個支路的流量來實現(xiàn)整個系統(tǒng)流量的均衡輸配,消除冷熱不均的現(xiàn)象。在總流量足夠的條件下,各個支路的流量變化不會互相影響,系統(tǒng)比較穩(wěn)定。
威格士溢流閥@VICKERS電磁換向閥
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