CPC F16K 11/0716 (2013.01) [F16K 11/07 (2013.01); F16K 17/168 (2013.01); F16K 31/44 (2013.01); F16K 31/602 (2013.01); F16K 35/025 (2013.01); F16P 3/00 (2013.01); F04B 23/00 (2013.01); F15B 13/0401 (2013.01); F15B 20/00 (2013.01); F16K 21/04 (2013.01); F16K 27/0263 (2013.01); Y10T 137/86107 (2015.04); Y10T 137/87249 (2015.04)] | 17 Claims |
1. A safety valve for a hydraulic or pneumatic tool, the safety valve comprising:
a body defining an incoming fluid passage via which fluid is able to pass from a fluid reservoir through the body to a tool head, and a return fluid passage via which fluid is able to return from the tool head through the body to the fluid reservoir;
a first position within the body, wherein the fluid is able to bypass the tool head and return to the fluid reservoir to prevent operation of the tool head, and at a second position within the body, wherein the fluid is able to flow to the tool head to allow operation of the tool head;
a biasing means operatively biasing to either a fail-safe position or a fail-dangerous position; and
an actuator positioned on an outside portion of the body, wherein the actuator is hand-operated and configured so that actuation thereof counteracts the biasing means and actuates the tool head into an inactive or active mode of operation.
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