F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/13
F16K 31/122 (2006.01) F01D 17/14 (2006.01) F16K 17/20 (2006.01) F16K 31/383 (2006.01) F16K 31/40 (2006.01) G21D 1/02 (2006.01)
Patent
CA 1177045
Abstract The valve stem (22) of the own-medium controlled shut-off valve has a lid (24) and a piston (20) movable in a cylinder (12). A first, cylindrical chamber (36) and a second annular chamber (37) facing the lid (24) are separated by a piston (20) and connected to a low-pressure chamber (50) by ducts (38; 65) extending in the housing (1, 10) of the shut-off valve and by connecting lines (46; 68) connected to said ducts outside the housing. The first chamber (36) is also connected to the inlet side of the shut-off valve via a duct (63) extending in the housing (1, 10) and containing at least one control valve (43) actuated by a control line (57). Closing valves (47 and 69) are provided in the connecting lines (46 and 68). A throttle means (45) having a fixed flow cross-section is disposed in the duct (38) of the first chamber (36) inside the housing (1, 10). The duct (65) of the second chamber (37) has a fixed minimum cross-section, The construction of the shut-off valve is simplified and made cheaper, without appreciably reducing its reliability, by disposing the closing valves in the connecting lines, providing the throttle means with a fixed flow criss- section in the duct and giving the duct associated with the second chamber a fixed minimum cross-section.
391932
Gowling Lafleur Henderson Llp
Sulzer Brothers Limited
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