F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
121/74
F15B 13/00 (2006.01) F01D 17/14 (2006.01) F16K 31/122 (2006.01) F16K 47/00 (2006.01)
Patent
CA 1203444
ABSTRACT OF THE DISCLOSURE A pneumatic servomotor is disclosed for use as an auxiliary drive for a steam isolating valve. It has a cylinder-piston-rod mechanism, the rod being connected to a droppable load. One side of the cylinder has a clearance space larger than the adjacent volume swept by the piston. The clearance space communicates with a pressurized medium source and with a pressurized medium sink, the other side of the cylinder is connected with a pressure medium sink. A constriction divides the clearance space into a smaller chamber at the piston and a larger chamber remote from the piston. The constriction is in the form of a throttle aperture which, in respect of resistance to a given rate of flow of air passing there- through, is equivalent to a free cross-section of not more than Fid = 0.02 D2, wherein D is the diameter of the cylinder. The invention prevents damage to the cylinder or its fixtures in the event of breakage of a predetermined breaking point.
423738
Gowling Lafleur Henderson Llp
Sulzer Brothers Limited
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