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Stem Assemblies, Plug Assemblies and Valves

一种阀塞组件、阀杆的技术，应用在具有阀杆组件的控制阀领域，能够解决先导头出现故障等问题

Inactive Publication Date: 2020-08-18
SECOR INT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, pilot heads are prone to failure in field service

Method used

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  • Stem Assemblies, Plug Assemblies and Valves
  • Stem Assemblies, Plug Assemblies and Valves
  • Stem Assemblies, Plug Assemblies and Valves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] figure 1 , image 3 and Figure 4 Valve 10 is shown having a body 12 including an inlet 14 and an outlet 16 . A valve closure or plug 22 is slidably movable along an inner surface 24 of a cage 18 secured within body 12 and bonnet 20 for regulating fluid flow between inlet 14 and outlet 16 . Such as image 3 shown, which is taken from figure 1 In an enlarged view of area 3 , the valve plug 22 includes a body 23 and a cap 32 . A pilot area or compartment 34 is formed inside the valve plug 22 between the junction of the body 23 and the cap 32 . The stem assembly 26 includes a shaft 28 having an axis or longitudinal axis 30 that extends to an end 50 . The valve plug assembly 74 includes a valve stem assembly coupled to the valve plug. In one embodiment, the cross-section of the end is less than or equal to the cross-section of the shaft (eg, as measured perpendicular to the longitudinal axis). In one embodiment, at least one of the shaft and the shaft end is circula...

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PUM

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Abstract

The present invention relates to valve stem assemblies, valve plug assemblies and valves. A stem assembly for a valve includes: a shaft having a longitudinal axis and a first end having a cross-section smaller than the cross-section of the shaft; and a protrusion proximate the first end portion, extending away from the axis. In response to the first end and the protrusion being positionable within a compartment of the valve plug having an opening in fluid communication with fluid of the valve during operation of the valve, the first end and the protrusion can be is movable relative to the valve plug between a first position and a second position. In the first position, the first end blocks the opening to prevent fluid flow through the opening; and in the second position, the first end is movable away from the compartment opening to Fluid flow is allowed through the opening.

Description

technical field [0001] The present invention relates to control valves, and more particularly to control valves having valve stem assemblies. Background technique [0002] Valves are widely used in fluid systems to provide controlled fluid flow behavior in the system. Some valves used in high pressure drop applications or with large seat diameters may require a pressure balanced trim, which typically includes an actuator operatively connected to a stem assembly with a valve between open and closed positions. A pilot tip in a small pilot area that extends into the valve plug. The actuator pushes the pilot tip of the stem assembly away from the closed position, relieving pressure in the cavity above the valve plug and allowing the actuator to lift the entire valve plug with reduced force. When the pilot area is closed, the valve plug is sealed, preventing fluid flow through the valve plug. [0003] With current valve stem assemblies, the pilot tip is threaded and welded to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K1/32F16K1/48F16K1/36
CPCF16K1/32F16K1/36F16K1/482F16K3/246F16K39/024F16K39/04F16K1/12F16K31/048F16K31/0655
Inventor 詹姆斯·克洛斯道格·亨特瑞安·谢尔登
Owner SECOR INT CO LTD
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