valve seat surface meaning in English

活门支承面

The movements of check valve located at valve valve seal on thebutterfly valve seat surface
升降式止回阀的阀瓣座落位于阀体上阀座密封面上。
In order to ensure that each valve flap valve seat surface can reach the appropriate location , in valve design hinge agencies , in order to have enough plug valve kai xuan space , and the valve genuine and comprehensive engagement with the valve seat
为了确保阀瓣每次都能到达阀座面的合适位置，阀瓣设计在铰链机构，以便阀瓣具有足够有旋启空间，并使阀瓣真正的、全面的与阀座接触。