Service of all internal check valve components shall be through top mounted access covers threaded to the main valve body.
Service of all internal check valve components shall be through top mounted access covers threaded to the main valve body.
所有止回阀内部部件的维修应该能够通过顶部安装的检修盖进入进行，这种检修盖应该通过螺纹固定在主阀门阀体上。