Poppet valve having an improved valve seat

Abstract

A pneumatic valve assembly (10,110) including a valve body (12,112) having an inlet port (30,130) in fluid communication with a source of pressurized air and a valve bore (36,136) extending axially within the valve body (12,112) with a valve member (46,146) movable between predetermined positions within the valve bore (36,136). The valve member (46,146) selectively movable to direct a flow of pressurized air from the inlet port (30,130) through the valve bore (36,136) to an outlet port (32,132). A valve element (52,152) is disposed upon the valve member (46,146) having an angular valve sealing surface (62,162), and a valve seat (82,182) is defined in the valve bore (36,136) formed at an oblique angle to provide a sealing contact with the valve sealing surface (62,162) when the valve member (46,146) is in a closed position thereby interrupting said flow of pressurized air.

Description

technical field [0001] The present invention relates generally to pneumatic valve assemblies, and more particularly to poppet valves having improved valve seats. Background technique [0002] Pneumatic valve assemblies are well known in the art of controlling the flow of compressed air into and out of various pneumatically actuated devices such as linear actuators, rotary actuators, air outlets or any other pneumatic device requiring precise control of working air or application. In the prior art, a type of pneumatic valve currently used in many situations is usually a poppet valve. Poppet valves are particularly useful with, for example, pilot operated pneumatic valves as part of an overall fluid power system. A conventional poppet valve arrangement includes a valve member movably supported within a valve body between predetermined positions. These positions are generally defined by the arrangement of the valve seat in the valve cavity. The valve member has a valve elem...

AI Technical Summary

Problems solved by technology

However, as the valve stroke length increases due to seat degradation as described above, the clearance in the actuator assembly cannot accommodate the longer stroke length and the armature will start hitting the valve body or pole piece

This results in a "hammer-anvil" effect between the various components, causing damage to these components and hammered particles can sometimes fall into the valve body and air flow path

These conditions cause the valve to wear out quickly, further shortening the life of the valve assembly

When valve assemblies are used in high speed and highly repetitive manufacturing and process environments, the shortened life of valve assemblies results in frequent replacement of these valve assemblies

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