| 摘要 |
A discharge valve for an extinguishing system, more specifically a valve formed by a body (1), with a high pressure inlet port (11) which can be coupled to a high pressure extinguishing gas source and a low or medium pressure outlet port (12), to distribution means for distributing said gas, a passage (14) of gas and a plug (6) of said passage (14) being located between both ports (11 and 12), said plug (6) being shiftable by a shiftable actuator (2) between two positions for closing, opening and regulating the gas outlet, the body (1) comprising a first chamber (22) communicated with an effective surface (22a) of pressure on the shiftable actuator (2), and operably suitable for causing the shifting of the plug (6) in an opening movement, a second chamber (23) communicated with an effective surface (23a) of pressure on the shiftable actuator (2), this second chamber (23) being opposite the first chamber (22) and operably suitable for shifting said plug (6) in a closure movement, and optionally a spring (5) for shifting the shiftable actuator (2) towards the closing position of the passage (14) of gas by the plug (6), where it comprises: - a first conduit with passageways (16a, 16b, 16c), arranged between a point of the body (1) of the valve subjected to high pressure and the first chamber (22), there being in said first conduit a blocking means (7) operable from the exterior, - a second conduit (19) for continuous communication between the second chamber (23) and the low and medium pressure outlet port (12); said first conduit being suitable in an inoperative position for the closing by the effect of the spring (5) and the low pressure in the effective surface (22a) of pressure in the first chamber (22), and in an operative position the opening of the plug (6) in the passage of gas by the increase of pressure on the effective surface (22a) of pressure in the first chamber (22), the regulation of the position of the plug (6) being enabled by the pressure in the effective surface (23a) of pressure of the shiftable actuator (2) of the second chamber (23) and the effect of the mentioned spring (5), and in that it comprises a check valve (16) in the passageways (16a, 16b, 16c) of the first conduit of the one-way flow pressure circuit between a high pressure point and the chamber (22), and a pressure venting conduit (10) of said chamber (22) through an equalizing valve (10a) loaded with a spring for fixing the controlled overpressure in said chamber (22), and in that the plug (6) is arranged in a closing position before a seat (14a) configured in the passage (14) of the gas, suitable for said plug (6) to be shifted towards the high pressure area defined between the high pressure port and said seat (14a) in an operative position.
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