The stem internally threaded and remains vertically stationary.
In the embodiments of both FIGS.
FIG. As mentioned above, in certain embodiments, the bore 32 may include a diameter 36 of at least approximately 5 inches.
In some embodiments, the opening 104 of each gate section 22 and 24 may include a diameter 106 equivalent to the diameter 36 of the bore 32 of the body 18. Water-tube boiler parts and Working Principle, What is Weldability|Factor Affecting Weldability, Arc welding Definition |Basics and equipment, Brazing definition and How to braze metals, Difference between Centrifugal pump and Reciprocating pump, Provide a minimum pressure drop across the disc, Occupy less space as compared to the globe valve, Use for full opening/closing (frequent opening/closing not recommended), Metallic disc or gate uses to stop the flow of working fluid, Create vibration in the partially open position, It is more subject to seat and disc wear than a, Repairing work such as grinding and lapping, are generally more difficult to achieve. Therefore, very little or no leakage through disc when the valve at full closed. For example, the diameter of the bore 32 may range from approximately 5 to 20 inches, approximately 5 to 15 inches, or approximately 5 to 10 inches, or approximately 10 to 15 inches. The split gate valve includes a rolling actuator to reduce friction and to convert a rotational input into a linear motion to move the first and second gate sections between the open and closed positions. FIG. In particular, the coupling mechanism 58 guides movement of the gate sections 22 and 24 towards the seat 54 in response to biasing force of biasing mechanism 48 (e.g., spring). Gate valves. In some series, this type of valve available in sizes from 1/2 to 2 inches rated for 2500 psig steam service. (American Society of Mechanical Engineers) Section VIII, Division 2, Boiler and Pressure Vessel Code Alternative Rules for Finite Element Analysis; disc and seat surface hardfaced with Stellite. This expansion causes some distortion of valve bodies. © 2004-2020 FreePatentsOnline.com.
2 is a schematic diagram of another embodiment of the split gate valve having the rolling actuator; FIG. In simple words, in non-rising stem gate valve, gate moves vertically up and down while stem remains stationary. The split gate valve 10 is as described in FIG.
The disc is free to adjust itself to the seating surface if one-half of the disc is slightly out of alignment due to some foreign … The illustrated ball screw 128 includes a screw shaft 130 including helical grooves 132 and a nut 134 including a plurality of ball bearings 136. By further example, the drive 16 may include a motor, such as an electric motor, a pneumatic motor, or a hydraulic motor. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. The body 18 and the gate 20 are as described in FIGS. This section is intended to introduce the reader to various aspects of art that may be related to various aspects of the present invention, which are described and/or claimed below. In certain embodiments, the coupling mechanism 58 may include a pin extending into slots with each gate section 22 and 24. & Terms of Use. FIG. Split wedge mostly uses for corrosive liquids. Although FIG. 2 illustrates an embodiment of the split gate valve 10 in an open position. All rights reserved. The body 18 may be constructed of cast iron, ductile iron, cast carbon steel, gun metal, stainless steel, alloy steels, corrosion resistant alloys, and/or forged steels. Tapered wedges can be part of the disc halves or separate elements. For example, the split gate valve 10 may operate at pressures ranging from approximately 5,000 to 25,000 psi, approximately 10,000 to 20,000 psi, approximately 5,000 to 10,000 psi, approximately 10,000 to 15,000 psi, approximately 15,000 to 30,000 psi, approximately 15,000 to 25,000 psi, approximately 20,000 to 30,000 psi, approximately 20,000 to 25,000 psi, or approximately 25,000 to 30,000 psi. A bottom portion 44 of the gate 20 is also coupled to a stem 46 (e.g., a balancing stem).
Screwed in the seat rings are considered replaceable since they may be removed and new seat rings installed.
In particular, the gate sections 22 and 24 are inserted within the opening 84 into the cavity 26 of body 18 with the length of 86 of the gate 20 crosswise (i.e. The helical grooves 132 provide a pathway for the ball bearings 136 to travel along as the nut 134 receives a rotational input as indicated by arrow 138. the European Pressure Equipment Directive (PED: 97/23/EC); the European Directive for Equipment and Protective Systems in Potentially Explosive Atmospheres (ATEX: 94/9/EC); A.S.M.E. The split gate valve 10 as described allows rolling friction (via the rolling actuator 12) to reduce the work required to mechanically operate the valve 10, in particular, large bore and/or high pressure gate valves 10. The roller screw 150 includes a screw shaft 152 including helical grooves 154 and a nut 156 including a plurality of rollers 158 disposed between opposite rings (e.g., ring 160). 5 is an exploded perspective view of an embodiment of a body of the split gate valve and the pair of gate sections; FIG. In some designs, wedge contact surfaces curved to keep the point contact close to the finest. 1 illustrates an embodiment of a split gate valve 10 having a rolling actuator 12. In addition, the gate sections 22 and 24 form a double seal against the seat of 54 of the split gate valve 10. In other embodiments, the diameter 105 of the opening 104 of each gate section 22 and 24 may be smaller than the diameter 36 of the bore 32 of the body 18. A correct profile of the disc half in the flexible wedge design that provides uniform deflection properties at the disc edge. The perimeter 88 of the cavity 26 and the opening 84 closely fit around both gate sections 22 and 24, thus, the gate 20 takes up most of the space within the cavity 26 of the body 18. The formation of the double seal allows the filling of the cavity of the split gate valve to test each seal of the double seal at the same time.
Rising stem valves are available in two basic designs. In addition, using the generally rectangular opening 84 adds more material between the gate 20 and the body 18 (e.g., thicker walls) to increase the strength and rigidity of the body 18 as opposed to a circular opening. Solid wedge valves installed at any position. The valve stem is a one-piece forged shaft with anti-rotating device.
1. The biasing mechanism 48 is configured to bias the gate sections 22 and 24 away from each other in directions 50 and 52, respectively. However, the rolling actuator 12 enables the application of less mechanical force or torque to the split gate valve 10 to open and close the valve 10 (i.e., move the gate). One or more specific embodiments of the present invention will be described below. generation, Rotary Valve for Industrial Fluid Flow Control, SEAL ASSEMBLY FOR A SOURCE OF PRESSURIZED FLUID, Medical valve with rotating member and method, Shunt valve for use in winterizing a pool. Some valves have a stem that rises through the hand wheel and some have a stem that is the thread to the bonnet. Alternatively, the perimeter 88 of the opening 84 may be circular, round, oval, or oblong. Wedge-shaped gate valves use two inclined seats and a slightly mismatched inclined gate, allowing for tight shut-off.. For example, the split gate valve 10 may operate at pressures ranging from approximately 5,000 to 30,000 psi or more.
In a Non-rising stem gate valve, no upward or downward movement of stem outside the valve body. The diameter of the bore may range from approximately 3 to 20 inches, approximately 3 to 15 inches, approximately 3 to 10 inches, approximately 10 to 15 inches, or approximately 15 to 20 inches. Thus, the rolling actuator 12 enables the use of the split gate design with large bore and/or high pressure valves 10 or any other combination of bore size and operating pressure that would require the rolling actuator 12 to reduce the amount of mechanical force or torque needed to open and close the valve 10 (e.g., a smaller bore size with high operating pressure or a larger bore size with a low operating pressure).
During the opening of the rising stem gate valve, stem along with gate moves upward while closing, stem along with gate moves downward.
Each roller 158 may be threaded (e.g., threads 162) or grooved. In some embodiments, the split gate valve 10 includes a large bore. The rolling actuator 12 is configured to convert the rotational input received by the drive 16 into a linear motion (e.g., linear activation force) to move the gate 20 (i.e., the pair of gates sections 22 and 24) between open and closed positions. (American Society of Mechanical Engineers) Section VIII, Division 1, Boiler and Pressure Vessel Code; A.S.M.E. As to the details of the split gate arrangement of the gate 20, the pair of gates sections 22 and 24 include a biasing mechanism 48 disposed between them. When the valve is the fully open condition, disc or gate fully removed from the flow path and provide no resistance for flow. The method also includes seating first and second gate sections of the split gate valve against opposite first and second seats to provide a double seal. For example, the actuation system 14 may be coupled to a top portion of the body 18 via a bonnet 19.