US 6,981,612 B2
Tamper-proof gas pin valve
Thomas S. Siimes, Windsor (Canada); and Timo Siimes, Windor (Canada)
Assigned to Gas Cylinder Technologies, Lake Shore (Canada)
Filed on Dec. 19, 2003, as Appl. No. 10/741,943.
Claims priority of provisional application 60/435210, filed on Dec. 19, 2002.
Prior Publication US 2004/0183043 A1, Sep. 23, 2004
Int. Cl. F16K 1/00 (2006.01)
U.S. Cl. 222—3 18 Claims
OG exemplary drawing
 
1. A valve assembly comprising:
a housing defining a first bore comprising an inlet and an outlet;
a piston movable within said bore between an open and closed position, wherein said piston comprises a pin section extending through said outlet;
a spring biasing said piston toward said closed position; and
an insert securable within said first bore by at least one barb, said spring disposed between said piston and said insert.