We suggest the use of a model DET expansion tank, the Watts Governor 80 ball cock with integral thermal expansion relief valve, or a 530C calibrated pressure relief valve.
2
旋塞和球形:关闭件是柱塞或球,围绕本身的中心线旋转。
Cock and ball: Turn off the prop is a plunger or a ball, rotating around its own axis.