Spirax-Sarco valve mechanism for B4 series 15lb.inverted bucket steam trap.   Spirax-Sarco valve mechanism less bucket is the device that allows the condensate and air to drain from the trap. The mechanism is a lever and seat operation, it is held in place by screwing the seat into the outlet port within the trap. With the inverted bucket attached to this mechanism, the steam pressure within the bucket keeps the lever up in turn keeping the seat closed when steam is present. When the steam cools and turns to a liquid state (condensate), the trap fills with condensate causing the bucket to drop and this opens the seat to allow the condensate and air to drain. 斯派莎克BRV73直接作用式減壓閥閥門(mén)機制B4系列15lb.inverted吊桶式疏水閥。    斯派莎克BRV73直接作用式減壓閥機構少鏟斗裝置，使冷凝水和空氣從陷阱排出。該機構是一個(gè)杠桿和座椅的操作，它在適當的位置通過(guò)螺紋連接在座椅進(jìn)入出口端口陷阱內舉行。與連接到這個(gè)機制倒斗，斗內的蒸汽壓力保持桿，反過(guò)來(lái)保持座位關(guān)閉時(shí)蒸汽存在。當蒸汽冷卻并變成液體狀態(tài)（冷凝），陷阱充滿(mǎn)冷凝水造成杯水車(chē)薪，這將打開(kāi)座椅，讓冷凝水和空氣排出。