PILOTED MIDDLE-HIGH PRESSURE GATE VALVE

• US 20110266471A1
• Filed: 03/16/2008
• Published: 11/03/2011
• Est. Priority Date: 05/24/2007
• Status: Abandoned Application

• Current Assignee: Zuoyi Wang
• Original Assignee: Zuoyi Wang
• Inventors: Wang, Zuoyi
• Application Number:
  US12/601,528
• Publication Number:
  US 20110266471A1
• Time in Patent Office: Days
• US Class Current: 251/25
• CPC Class Codes: F16K 3/188 by means of hydraulic forces
• CPC Class Codes: F16K 39/04 for sliding valves

Abstract

A piloted middle-high pressure gate valve includes a valve stem (4) connecting with a gate plate (9) and a valve body (5). A pilot unloading valve (6) is installed under said valve stem (4), under which is said gate plate (9) that has a balancing chamber (14) therein. A valve core (8) provided in said balancing chamber (14) is between said valve (5) and a back pressure spring (7) and has a damping hole (13) for communicating a valve inlet with said balancing chamber (14). Such a gate valve is adapted for on-off control of a middle high pressure fluid.

Claims

1. A piloted middle-high pressure gate valve consists essentially of a valve stem, connected to a gate plate and a valve body;

said piloted middle-high pressure gate valve is characterized in that a pilot unloading valve is provided under said valve stem, under which is said gate plate(9) that has a balancing chamber(14) therein;

A valve core provided at inside of the balancing chamber is disposed between said valve body and a back pressure spring;

said valve core includes a damping hole for connecting a valve inlet with the balancing chamber.

2. A piloted middle-high pressure gate valve of claim 1, wherein a sealing surface of the valve core is selected from a spherical surface, a tapered surface or a flat surface.

3. A piloted middle-high pressure gate valve of claim 1, wherein said pilot unloading valve comprises of a pilot unloading valve core and a pilot unloading back pressure spring;

a distal end of said pilot unloading back pressure spring is attached to said valve stem.

4. A piloted middle-high pressure gate valve of claim 2, wherein said pilot unloading valve comprises of a pilot unloading valve core and a pilot unloading back pressure spring;

a distal end of said pilot unloading back pressure spring;

a distal end of said pilot unloading back pressure spring is attached to said valve stem.

6. A piloted middle-high pressure gate valve of claim 1, wherein a bottom side of the valve body includes a stop for corresponding the valve plate and/or a chute is provided on the valve plate or on the pilot unloading valve.

7. A piloted middle-high pressure gate valve of claim 2, wherein a bottom side of the valve body includes a stop for corresponding the valve plate and/or a chute is provided on the valve plate or on the pilot unloading valve.

8. A piloted middle-high pressure gate valve of claim 3, wherein a bottom side of the valve body includes a stop for corresponding the valve plate and/or a chute is provided on the valve plate or on the pilot unloading valve.

5. (canceled)