Pilot operated relief valve
US4402341A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Apr 6, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7769
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pilot operated relief valve for use on medium and high pressure vessels, conduits and the like. A two-stage, non-flowing valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by (35), (36), (38), and (39) associated with the first stage poppet are utilized to provide positive valve operation. In a preferred embodiment the main valve is mounted directly onto the pressure vessel which is to be vented at a predetermined pressure. The pilot is preferably mounted closely adjacent to and in fluid communication with the main valve. A flow adapter (100) having a self-cleaning orifice is disposed intermediate said main valve head volume (68) and pilot vent port (1) to provide improved operation of the combination. A ball (16) selector, (24, 15, 76) provides means for conveniently connecting to a field testing either the pilot or the entire valve, providing improved setpoint and reset or blowdown adjustments for the overall combination. A single stage proportional pilot valve (131) operates main valve (7) to provide pressure relief flow corresponding to the degree of over pressure (Ref. FIG. 16). A partially pressure balanced large dia…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.