| 摘要 |
<p>The valve has a pressure measurement device (4) e.g. mechanical pressure gauge, mounted in a body (10) within a junction bore communicating with an internal circuit of the body. A residual pressure clapper (2) and the device are arranged in series in a conduit of the circuit. The clapper is arranged upstream of the device in the bore based on a path from an end (1) to another end of the circuit. A by-pass conduit (7) connects a pressure measurement chamber of the device to the circuit portion located upstream of the clapper, to by-pass the clapper to measure pressure upstream of the clapper.</p> |
