| 摘要 |
A test connector enables measurement of pressures contained within a body. The body houses check valves and includes studs to attach a cover to a head of the body. Removal of the cover renders the check valves accessible. The check valves are normally compressed against valve seats formed in the head but when moved away from their seats provide access to the pressures. The test connector includes a contact plate, a support plate, two springs sandwiched therebetween and two double flanged nuts. Each spring is disposed so that it is axially aligned with throughholes defined in the plates. Each nut has its middle section disposed coaxially within one of the springs and its flanged ends keep the plates in proximity to each other while the springs seek to force them apart. Hollow plungers have one end seated in plunger bores in the support plate with the other end free to slide through flow bores in the contact plate. As the nuts are initially threaded onto the studs, the contact plate soon seals against the head without the plungers emerging from the flow bores. As the nuts are further threaded onto the studs, the support plate moves toward the contact plate thereby further compressing the springs and eventually forcing the plungers to emerge from the flow bores to unseat the check valves. This permits each of the pressures contained thereby to communicate through the hollow plungers and out the plunger bores thereby allowing access to the pressures within the body.
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