Valves and valve actuation – Rotary valves – Ball valve
Reexamination Certificate
2006-03-24
2008-03-25
Fox, John (Department: 3753)
Valves and valve actuation
Rotary valves
Ball valve
C251S171000, C251S315130
Reexamination Certificate
active
07347408
ABSTRACT:
A high differential pressure, low torque precision temperature control valve is disclosed herein. This valve is trunnionated with stem components that are separable from the plug for ease of maintenance and manufacturability and thus reducing the need to remove the entire plug and sealing assemblies in the field. Field repair of stem sealing devices can be accomplished inline . The stem design can be smaller in diameter with smaller bearing surfaces than would be anticipated creating a lower requirement of torque to rotationally transposition the plug within the fluid chamber while under high pressure. This valve's lower trunnionated stem is stationery reducing the problems associated with o-ring failure and leakage problems with objects that rotate. Due to the design of the orifices in the plug, this valve is capable of repeatability at lower opening ranges than prior art valves and reduces jetting, caviation and erosion often associated with lower opening ranges. Sealing devices are tensioned onto the plug through the use of non-metallic o-rings reducing wear and friction issues thereby further reducing the torque requirement to adjust the valve. The throughports of the plug in this valve are designed such as to create an equal percentage characteristic that does not exceed prescribed linear flow characteristics and provides a relatively constant total combined Cvover the travel range of the plug.
REFERENCES:
patent: 221288 (1879-11-01), Dewrance
patent: 3206164 (1965-09-01), Yopp
patent: 3323537 (1967-06-01), Shafer
patent: 3367359 (1968-02-01), Johnson
patent: 3424190 (1969-01-01), Wolfensperger
patent: 3599932 (1971-08-01), Scaramucci
patent: 3656711 (1972-04-01), Toelke
patent: 3737145 (1973-06-01), Heller et al.
patent: 4026516 (1977-05-01), Matousek
patent: 4292989 (1981-10-01), Cazzaniga et al.
patent: 4337919 (1982-07-01), Ripert
patent: 4744572 (1988-05-01), Sahba et al.
patent: 4822000 (1989-04-01), Bramblet
patent: 5338003 (1994-08-01), Beson
patent: 5494256 (1996-02-01), Beson
patent: 5542645 (1996-08-01), Beson
patent: 5624101 (1997-04-01), Beson
patent: 5937890 (1999-08-01), Marandi
patent: 6948699 (2005-09-01), Keiser
Guideline for Application of Control Valves, Process Industry Practices, Jan. 2005 Revision, University of Texas at Austin, Austin Texas.
Proceedings of the Eighth NRC/ASME Symposium on Valve and Pump Testing (NUREG/CP-0152, vol. 3), 2002, US Nuclear Regulatory Commission, MS Kalsi, B. Eldiwany, V. Sharma, D. Somogyi. Kalsi Engineering, Inc. Abstract p. 3A-47-3A-59.
Dallara Ken
Fox John
Griswold Controls Inc
Law Offices of Ken Dallara
LandOfFree
High differential pressure, low torque precision temperature... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High differential pressure, low torque precision temperature..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High differential pressure, low torque precision temperature... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3975454