SAFETY VALVE FOR LIQUID PRESSURE CYLINDERS

• US 3,645,286 A
• Filed: 05/29/1969
• Issued: 02/29/1972
• Est. Priority Date: 05/29/1969
• Status: Expired due to Term

• Current Assignee: John Le Roy Follett
• Original Assignee: John Le Roy Follett
• Inventors: Follett, John Le Roy
• Primary Examiner(s): Nelson M. Cary
• Assistant Examiner(s): Gerard, Richard
• Application Number:
  US04/828,982
• Time in Patent Office: 1,006 Days
• Field of Search: 137/68,329.4,460,462,498,614.19,614.2,629,630,614.11-614.21,517,519,519.5 222/3 73/333
• US Class Current: 137/68.14
• CPC Class Codes: F16K 17/28 operating in one direction only
• CPC Class Codes: F16K 17/285 the cutting-off member being a ball F16K17/30 takes precedence
• CPC Class Codes: Y10T 137/1654 Separable valve coupling or conduit
• CPC Class Codes: Y10T 137/7727 Excessive flow cut-off
• CPC Class Codes: Y10T 137/88054 Direct response normally closed valve limits direction of flow

Abstract

Valve for use with liquid pressure gas cylinders comprising a valve body having a shank threaded into the cylinder, and having a central bore leading to a valve seat, and a manually actuated valve movable into sealing engagement with the seat, a safety valve located on the inner end of the shank and connecting with the bore, the safety valve being adapted to seal the bore against outflow of gas at an abnormal rate, and means responsive to final closing movement of the valve member for opening the safety valve seal.

Claims

1. In a valve for use with pressure liquid gas cylinders comprising a valve body having a shank adapted for threading engagement with the cylinder, said shank having a central bore leading to a valve seat, and a valve member adapted to be moved into sealing engagement with said seat, a safety valve associated with the inner end of said shank biased to an open position and responsive to excess flow conditions in the bore to arrest flow therethrough, said safety valve having bore sealing means adapted to move into sealing relation to said bore to prevent outflow of gas into the bore at an abnormal rate, and means responsive only to final closing movement of said valve member toward the seat for establishing a bypass from one side of the safety valve to the other for equalizing the pressure on opposite sides of the bore sealing means to enable the safety valve to move to an open position terminating the seal formed by the bore sealing means upon closure of said valve member.

2. In a valve as set forth in claim 1 wherein the valve seat comprises spaced inner and outer annular seats, and the valve member is provided with means for preliminary engaging the outer seat before engaging the inner seat and the final closing movement of the valve against the inner seat.

3. In a valve as set forth in claim 2 wherein the means responsive to the final closing movement of the valve is directly engaged by the valve member inwardly of its inner seat.

4. In a valve as set forth in claim 1 wherein the means responsive to the final closing movement of the valve is directly engaged by the valve member inwardly of its seat.

5. In a valve as set forth in claim 1 wherein the safety valve comprises an annular seat shoulder adjacent the inner end of the bore, and a sleeve inserted in the bore having a valve element slidable in the sleeve to engage said seat shoulder.

6. In a valve as set forth in claim 5 wherein the means responsive to the final closing movement of the valve includes a relief valve in the valve element to permit equalization of pressure on opposite sides of the valve element while seated on the seat shoulder, to permit movement of the valve element from its seat.

7. In a valve as set forth in claim 5 wherein the means responsive to the final closing of the valve includes a passage in the valve body extending from the inner portion of the shank to a point inwardly of the seat, and a relief valve in the passage opened upon the final closing movement of the valve member.

8. In a valve as set forth in claim 1 wherein the shank is provided with an annular transverse groove to establish a plane of weakness for fracture of the shank externally of the portion adapted for threaded engagement with a cylinder and between the valve seat and the safety valve, and wherein the means responsive to final closing movement extends across the plane of weakness and is composed of parts readily separable substantially in the plane of weakness.

9. In a valve as set forth in claim 1 wherein the safety valve is within a cylinder.