Hydraulic time delay valve

A hydraulic time delay valve, comprising:

• a hydraulic timer valve having a valve pressure port, a valve return port, a valve cylinder port and porting means including a depressible valve stem extending therefrom for porting hydraulic fluid from the valve pressure port to the valve cylinder port;
• a cylinder having an axis coaxial with the valve stem and coupled to the timer valve in a manner whereby said valve stem extends into said cylinder, said cylinder having a cylinder return port and an open bottom port;
• a piston in said cylinder axially movable from a depressed position in which the piston blocks the open bottom port of said cylinder to an extended position in which said piston frees said open bottom, said piston having a piston stem in coaxial alignment with the valve stem;
• a spring coaxially positioned around said piston stem in said piston for forcing said piston to its depressed position;
• a substantially cylindrical end cap having a bottom surface and a cylindrical projection extending from said bottom surface accommodating the lower portion of said cylinder and having a cap open port and a channel extending through the end cap from the cap open port to said open bottom;
• said piston having a base portion and a first cylindrical portion extending from the base portion and coaxial with said cylinder for accommodating said spring and said end cap having a base member and a cylindrical projection extending from the base member coaxial with and surrounding part of said cylinder;
• and
• a directional flow control valve in the channel for restricting fluid flowing from said cap open port to said open bottom, whereby hydraulic fluid applied under pressure to said valve pressure port depresses said piston to its depressed position and hydraulic fluid applied under pressure to said cap open port is restricted by the directional flow control valve for a period of time determined by a desired time delay and then flows through said channel to said open bottom and extends said piston against the force of the spring and against the force of return hydraulic fluid supplied under pressure to the cylinder return port and whereby after the lapse of the period of time said piston stem contacts the valve stem thereby causing hydraulic fluid to port from said valve pressure port to said valve cylinder port to provide high pressure hydraulic fluid flow to a hydraulic device coupled to said valve cylinder port.