Ball valve

• US 20050258386A1
• Filed: 05/18/2005
• Published: 11/24/2005
• Est. Priority Date: 05/19/2004
• Status: Active Grant

• Current Assignee: Zhejiang Sanhua Company Limited (Sanhua Holding Group Company Limited)
• Original Assignee: Zhejiang Sanhua Company Limited (Sanhua Holding Group Company Limited)
• Inventors: Wang, Xizhong
• Granted Patent: US 7,243,900 B2
• Time in Patent Office: Days
• US Class Current: 251/174
• CPC Class Codes: F16K 5/0689 between housing and plug
• CPC Class Codes: F16K 5/20 for plugs with spherical surfaces

Abstract

The invention provides a ball valve for refrigerating system. Conventional ball valves have plastic sealing gaskets on both sides of the valve ball, but they suffer from compression creep of the plastic sealing gaskets and great permanent compression deformation under high temperature and pressure, thus fail to reach desired sealing effect. The invention comprises a valve body, a valve seat that suits to said valve body by screw thread, a valve ball accommodated within said valve body, two plastic sealing elements on both sides of said valve ball, a valve rod connected to said valve ball, and a valve cap on said valve rod, wherein at lease one of said plastic sealing elements is abnormity sealing element on which suitable spring assembly is configured. The spring assembly consists of at least two springs with ladder-shaped longitudinal section that are reverse-superimposed. The inside of said abnormity sealing element fits well with the surface of said valve ball, while its outside functions as supporting surface and acting surface for said spring assembly. The invention provides ball valves with durable and better sealing.

Claims

1. A ball valve, comprising a valve body (1), a valve seat (2) that suits to said valve body by screw thread, a valve ball (3) accommodated within said valve body, two plastic sealing elements on both sides of said valve ball, a valve rod (4) connected to said valve ball, and a valve cap (5) on said valve rod, wherein at lease one of said plastic sealing elements is abnormity sealing element (6) on which suitable spring assembly (7) is configured. The spring assembly (7) consists of at least two springs (12) with ladder-shaped longitudinal section which are reverse-superimposed. The inside of said abnormity sealing element (6) fits well with the surface of said valve ball (3), while its outside functions as supporting surface (8) and acting surface (9) for said spring assembly.

2. A ball valve according to claim 1, wherein ring metal gasket (10) is respectively configured on both ends of said spring assembly (7).