Valve for use in handling abrasive materials and method of wear prevention
First Claim
1. A valve, comprising:
- a casing including an elongated body;
means in said body providing an inlet chamber;
means in said body providing an outlet chamber, said inlet and outlet chambers being axially aligned, with the axis of said chambers disposed at right angles to the axis of said body;
ported valve plate means in said casing disposed between said chambers arranged to control flow of material from said inlet chamber into said outlet chamber;
separate stationary guide means mounted in said body extending from one end to the other end thereof;
means mounting said valve plate means for reciprocating movement on said guide means to position its port in and out of registration with said chambers; and
means for reciprocating said mounting means including means in said casing surrounding said guide means and supported between said mounting means to effect said reciprocating movement of said valve plate means.
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Accused Products
Abstract
A valve, comprising: a cylindrical casing, closed at its ends by covers, and having axially aligned inlet and outlet chambers midway of its length disposed at right angles to the axis of the casing. Communication between said chambers is controlled by a ported, fluid pressure operated, movable valve plate assembly, including parallel cylinders, each containing a stationary piston connected to the inner end of a pair of axially aligned rods, or guides, fixed at their outer end to the covers. Each rod has a passageway communicating at its inner end with one end of its associated cylinder for supplying operating fluid thereto to bodily reciprocate the valve plate assembly on said rods within the casing. An adjustable collar positions a fixed wear plate in sealing engagement with one side of the valve plate assembly, and a fluid pressure actuated loading ring urges a floating wear plate into contact with the other side of said valve plate assembly. The casing may be pressurized by gas or liquid, but in any event, such pressure is maintained equal to or preferably slightly lower than the fluid pressure applied to the loading ring, but higher than the pressure in the system in which the valve is installed. With such pressure relationship, any abrasive material being handled by the system is prevented from entering between the movable valve plate assembly and the fixed and floating wear plates, respectively, thereby eliminating or reducing leakage and wear to a minimum. When liquid is used as the casing pressurizing fluid and/or the operating fluid supplied to the cylinders, it is preferably filtered, and may also be circulated through heat exchange means, if cooling thereof is necessary or desirable.
The invention further includes a method of preventing abrasion, i.e., scoring and galling of the valve seating surfaces when the valve is installed in a system handling abrasive material.
50 Citations
27 Claims
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1. A valve, comprising:
- a casing including an elongated body;
means in said body providing an inlet chamber;
means in said body providing an outlet chamber, said inlet and outlet chambers being axially aligned, with the axis of said chambers disposed at right angles to the axis of said body;
ported valve plate means in said casing disposed between said chambers arranged to control flow of material from said inlet chamber into said outlet chamber;
separate stationary guide means mounted in said body extending from one end to the other end thereof;
means mounting said valve plate means for reciprocating movement on said guide means to position its port in and out of registration with said chambers; and
means for reciprocating said mounting means including means in said casing surrounding said guide means and supported between said mounting means to effect said reciprocating movement of said valve plate means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a casing including an elongated body;
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10. A valve, comprising:
- a casing including an elongated cylindrical body and a cover closing each end of said body, said body having an inlet chamber and an outlet chamber axially aligned with said inlet chamber;
a valve plate assembly disposed diametrically in said body between said chambers arranged to control the flow of material from said inlet chamber into said outlet chamber;
means in said body including separate stationary guide means supporting and mounting said valve plate assembly for bodily reciprocating movement on said guide means relative to said chambers, from one extreme position to another extreme position, said valve plate assembly including at least one valve plate having an imperforate area for obstructing communication between said chambers when in said one extreme position, and having a port that registers with said chambers for establishing communication between said chambers when in said other extreme position; and
means operable to reciprocate said valve plate assembly including means surrounding said guide means and being supported between said mounting means for movement from said one extreme position to the other. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- a casing including an elongated cylindrical body and a cover closing each end of said body, said body having an inlet chamber and an outlet chamber axially aligned with said inlet chamber;
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19. A valve, comprising:
- a casing including an elongated hollow body;
a closure cover mounted upon each end of said casing, said casing having an inlet chamber, an outlet chamber;
a movable valve plate assembly disposed between said chambers arranged to control the flow of material from said inlet chamber into said outlet chamber, said movable valve plate assembly comprising a pair of cylinders;
a stationary piston disposed in each of said cylinders midway between said covers; and
two pairs of stationary guide rods, means for mounting said valve plate assembly for sliding engagement on said pair of guide rods, said mounting means surrounding said guide means each pair of guide rods having an inner end connected to one end of one of the stationary pistons, and an outer end fastened to one of said covers, each rod having passage means communicating at its inner end with its associated cylinder to supply operating fluid for moving said valve assembly along said guide rods;
an upper cylindrical member mounted in said body providing an inlet chamber, said upper cylindrical member having a cylindrical extension at its lower end;
a stationary wear plate mounted upon said extension, said stationary wear plate having an opening aligned with said inlet chamber, said extension having an externally threaded portion above said stationary wear plate;
an adjusting ring mounted upon said threaded portion and engaging the upper side of said stationary wear plate;
a lower cylindrical member mounted in said body in axial alignment with said upper cylindrical member, said lower cylindrical member having a cylindrical extension at its upper end;
a floating wear plate mounted thereon, said lower cylindrical member having a groove in its upper end surrounding its aforesaid extension;
a loading ring in said groove engaging the lower side of said floating wear plate, said lower cylindrical member having a passageway for pressure fluid communicating with said groove below said loading ring for applying pressure to said floating wear plate; and
means for pressurizing said loading ring to sealingly engage said floating wear plate with said valve plate assembly; and
means for pressurizing said casing to prevent material from getting between said stationary and floating wear plates and said valve assembly. - View Dependent Claims (20, 21, 22)
- a casing including an elongated hollow body;
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23. The method of preventing wear on the seating surfaces of a valve having a closed casing containing inlet and outlet chambers, and having valve plate means engaged with said seating surfaces for controlling flow between said chambers, comprising:
- applying loading pressure to maintain the valve plate means and seating surfaces in sealing contact;
introducing fluid under pressure into the valve casing in surrounding relation to the valve plate means to pressurize the interior of said casing; and
maintaining said loading and said casing pressure while material is flowing through the valve in such relation as to prevent abrasive material from getting between said seating surfaces and said valve plate means and into said casing. - View Dependent Claims (24, 25, 26)
- applying loading pressure to maintain the valve plate means and seating surfaces in sealing contact;
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27. The method of preventing abrasion of the seating surface of a valve installed in a pressurized system handling abrasive material, said valve having a closed casing containing an inlet chamber and an outlet chamber, and valve plate means engaged with said seating surfaces and controlling the flow of abrasive material from said inlet chamber into said outlet, comprising:
- introducing fluid under pressure into the valve casing in surrounding relation to the valve plate means to pressurize the interior of said casing, subjecting said valve plate means to a loading pressure to maintain the same in sealing contact with said seating surfaces; and
maintaining said casing pressure lower than said loading pressure, but higher than said system pressure to prevent abrasive material from getting between said seating surfaces and said valve plate means and into said casing, while fluid is flowing through the valve.
- introducing fluid under pressure into the valve casing in surrounding relation to the valve plate means to pressurize the interior of said casing, subjecting said valve plate means to a loading pressure to maintain the same in sealing contact with said seating surfaces; and
Specification