port 49 drops to zero at the same time spring 50 see fig2 c of the 3 way valve 40 pushes the piston 42 away from the ball check 44 in the direction of arrow p and spring 52 biases ball check 44 to close air passage 45 closes and the air passage 70 from the pilot bore 68 opens to atmosphere exhausting through the exhaust passage 46 in the direction of arrow q it is to be understood that spring 50 may be replaced with various springs under differing tensions if back pressure so requires and if the valve 10 is required to close at a faster rate the loss of pressure in pilot bore 66 causes the spring 62 to shift the cartridge spool 72 of the counterbalance valve 20 in the direction of arrow r and to close the main seat 26 the 3 way valve 40 closes air passage 45 so that any increase in pressure due to load momentum will not open the counterbalance valve 20 causing the air cylinder 14 to drift after stopping with specific reference to fig5 8b another embodiment valve 100 according to the present invention may be seen the valve configuration described and illustrated in these views is preferably used in applications requiring high cylinder pressure in two directions of motion an example of such an application is a heavy load application in which movement in two directions is.