Containment extends function pit valve

The utility model belongs to containment extends function pit valve, concretely relates to requires valve and valve place pipeline to have containment isolating function for one kind, can prevent to be responsible for the valve of line and the any leakage of inside isolating valve. This valve is arranged in the pit of CSP, RSI system, makes valve and valve place pipeline have containment isolating function to design any leakage that can prevent to be responsible for line and inside isolating valve. Through such structural design, can simplify the structure by furthest, make overall structure compact to reduce the connection between the part, reduce weight effectively, improve holistic anti -seismic performance. 本实用新型属于安全壳延伸功能地坑阀，具体涉及种要求阀门和阀门所在管线具有安全壳隔离功能，能防止主管线和内部隔离阀任何泄漏的阀门。该阀门位于CSP、RSI系统的地坑中，使阀门和阀门所在管线具有安全壳隔离功能，并且被设计成能防止主管线和内部隔离阀的任何泄漏。通过这样的结构设计，可以最大限度地简化结构，使整体结构紧凑，并减少部件之间的连接，有效地降低重量，提高整体的抗震性能。