Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1999-03-03
2000-01-04
Lee, Kevin
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
251212, 2512495, F16K 300
Patent
active
060098996
ABSTRACT:
A variable orifice dual gate valve having two opposed slidable valve gates in overlapping sliding contact relationship. Inner orifice edges of these plates coact to form a variable size orifice in the valve body upon simultaneously sliding of the valve gates in opposite directions through manipulation of a gear and screw drive mechanism. The gear and screw drive mechanism includes a handle drive shaft connected at an exposed end to a valve handle and a drive gear is secured to the other end of the handle drive shaft for axial rotation. This drive gear is meshed in driving engagement with two driven gears that in turn are respectively secured to drive right hand lead screw and left hand lead screw shafts. A right hand follower nut and a left hand follower nut are respectively threadably received on these lead screw shafts and gate slide drive shafts are in turn secured to these nuts respectively for follower movement with the nuts. These gate slide valves are slidably received in slide guides in the valve body for guided axial sliding movement and they are also respectively connected to the valve gates for simultaneously sliding the gates in opposite directions upon rotation of the valve handle to adjust the orifice of the valve.
REFERENCES:
patent: 2810394 (1957-10-01), Ferguson
patent: 4090534 (1978-05-01), Martin et al.
patent: 4182359 (1980-01-01), Rickard
patent: 4531359 (1985-07-01), Jandrasi et al.
patent: 4760989 (1988-08-01), Elliott et al.
patent: 5538037 (1996-07-01), Pizao
Lee Kevin
Power & Industrial Services Corporation
LandOfFree
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