GB890111A - Improvements in or relating to fluid pressure relief valve assemblies - Google Patents
Improvements in or relating to fluid pressure relief valve assembliesInfo
- Publication number
- GB890111A GB890111A GB1683057A GB1683057A GB890111A GB 890111 A GB890111 A GB 890111A GB 1683057 A GB1683057 A GB 1683057A GB 1683057 A GB1683057 A GB 1683057A GB 890111 A GB890111 A GB 890111A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- ball
- spring
- loaded
- relief valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012530 fluid Substances 0.000 title abstract 5
- 230000000712 assembly Effects 0.000 title 1
- 238000000429 assembly Methods 0.000 title 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/512—Arrangement of valves
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Safety Valves (AREA)
Abstract
890,111. Hydraulic pit props. B.R.D. CO. Ltd. May 23, 1958 [May 28, 1957], No. 16830/57. Class 20(2) [Also in Group XXIX] A fluid pressure relief valve for an hydraulic pit prop comprises a spring loaded ball 12 which controls the discharge of fluid from a chamber 21 forming part of a pressurized fluid system for the prop into a chamber 1 and a second spring- loaded ball 17 which controls the discharge of fluid from chamber 1 and which initiates the latter discharge at a pressure which is less than the pressure which causes operation of the ball valve 12. The ball 12 is loaded by a spring 14 acting through a pressure plate 13. The ball 17 is mounted in a plug-like subsidiary housing 7 and is loaded by a spring 18. A bleed passage from chamber 1 to the exterior may be provided by a clearance between the engaging screw threads of the plug 7 and the chamber body 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1683057A GB890111A (en) | 1957-05-28 | 1957-05-28 | Improvements in or relating to fluid pressure relief valve assemblies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1683057A GB890111A (en) | 1957-05-28 | 1957-05-28 | Improvements in or relating to fluid pressure relief valve assemblies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB890111A true GB890111A (en) | 1962-02-28 |
Family
ID=10084455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1683057A Expired GB890111A (en) | 1957-05-28 | 1957-05-28 | Improvements in or relating to fluid pressure relief valve assemblies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB890111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108476686A (en) * | 2018-05-28 | 2018-09-04 | 河南工学院 | A kind of air-blowing auxiliary impact type seedling taking device |
-
1957
- 1957-05-28 GB GB1683057A patent/GB890111A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108476686A (en) * | 2018-05-28 | 2018-09-04 | 河南工学院 | A kind of air-blowing auxiliary impact type seedling taking device |
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