Pressure operated valve means for controlling flow in a flow line

Claim 1

A SPRAY VALVE COMPRISING A VALVE BODY HAVING A CHAMBER AT ONE END PORTION THEREOF, A PRIMARY BORE AT THE OTHER END PORTION THEREOF AND A SECONDARY BORE THEREBETWEEN, A PISTON MEMBER INCLUDING AN END PORTION, RESIDING WITHIN SAID CHAMBER, A SPOOL SLIDABLY RESIDING WITHIN SAID PRIMARY BORE AND A STEM MEMBER SLIDABLY RESIDING WITHIN SAID SECONDARY BORE, SAID SPOOL HAVING A REDUCED PORTION FORMING A MOVABLE CHAMBER WITH THE SIDE WALLS OF SAID PRIMARY BORE, SAID PISTON MEMBER HAVING FIRST AND SECOND FACES WITH A SURFACE ON SAID SPOOL COMPRISING SAID FIRST FACE AND A SURFACE ON SAID PISTON HEAD COMPRISING SAID SECOND FACE, A GAS INLET CONNECTED TO SAID MOVABLE CHAMBER, A GAS OUTLET CONNECTED TO SAID SECONDARY BORE, WALL MEANS BETWEEN SAID PRIMARY AND SAID SECONDARY BORE FORMING A VALVE SEAT AND WALL MEANS BETWEEN SAID SPOOL AND SAID STEM FORMING CLOSURE MEANS, SAID PISTON MEMBER SLIDABLY MOVABLE BETWEEN A FIRST AND A SECOND POSITION, SAID PISTON MEMBER IN SAID FIRST POSITION PROHIBITING PASSAGE OF GAS FROM SAID GAS INLET TO SAID GAS OUTLET, A DISPENSABLE MATERIAL INLET CONNECTED TO SAID PRIMARY BORE PROVIDING COMMUNICATING WITH SAID FIRST FACE OF SAID PISTON MEMBER, A DISPENSABLE MATERIAL OUTLET CONNECTED TO SAID PRIMARY BORE, SAID PISTON MEMBER IN SAID FIRST POSITION PROHIBITING COMMUNICATION BETWEEN SAID DISPENSABLE MATERIAL INLET AND SAID DISPENSABLE MATERIAL OUTLET, RESTRICTED PASSAGEWAY MEANS EXTENDING WITH SAID PISTON MEMBER AND PROVIDING COMMUNCATING BETWEEN SAID GAS OUTLET AND SAID CHAMBER, A SPRING MEMBER RESIDING WITHIN SAID COMPRESSION CHAMBER AND BEING OPERABLY CONNECTED TO SAID PISTON MEMBER FOR URGING SAID PISTON MEMBER TO SAID FIRST POSITION, PUMP MEANS FOR URGING DISPENSABLE MATERIAL INTO SAID DISPENSABLE MATERIAL INLET AND EXERTING A FORCE AGAINST SAID FIRST FACE OF SAID PISTON MEMBER THEREBY MOVING SAID PISTON MEMBER OF SAID SECOND POSITION WHEREBY DISPENSABLE MATERIAL TRAVELS THROUGH SAID DISPENSABLE MATERIAL OUTLET AND GAS FLOWS FROM SAID MOVABLE CHAMBER PAST SAID SEAL MEANS TO SAID GAS OUTLET AND BLEEDS THROUGH SAID RESTRICTED PASSAGEWAY MEANS TO SAID CHAMBER, DEACTUATION OF SAID PUMP MEANS CAUSING SAID FORCE TO BE REMOVED FROM SAID FIRST FACE OF SAID PISTON MEMBER WHEREBY SAID GAS PRESSURE IN SAID CHAMBER AND SAID SPRING MEMBER MOVE SAID PISTON MEMBER BACK TO SAID FIRST POSITION WHEREBY GAS IS PREVENTED FROM PASSING FROM SAID GAS INLET TO SAID GAS OUTLET.