Blow molding valve for a blow molding valve block

摘要

A blow molding valve (400) is provided. The blow molding valve (400) is adapted to be positioned within a blow molding valve block (401) including a control pressure chamber (408), a process gas chamber (450), and a piston bore (413). The blow molding valve (400) includes a control piston (402) movable within the control pressure chamber (408) and a portion of the piston bore (413), the control piston (402) being in fluid communication with a control pressure supply. A diaphragm (405) is provided and positioned between the process gas chamber (450) and the control piston (402) such that the diaphragm provides a fluid tight barrier between the process gas chamber (450) and the control piston (402).

主权项

1. A blow molding valve block (401) including a blow molding valve (400) positioned within the blow molding valve block (401), with the blow molding valve (400) comprising:
a control pressure chamber (408); a process gas chamber (450); a piston bore (413); a control piston (402) movable within the control pressure chamber (408) and a portion of the piston bore (413), the control piston (402) being in fluid communication with a control pressure supply; and a diaphragm (405) positioned between the process gas chamber (450) and the control piston (402) such that the diaphragm provides a fluid tight barrier between the process gas chamber (450) and the control piston (402); an auxiliary piston (404) movable within the piston bore (413) and the process gas chamber (450), wherein the diaphragm (405) is positioned between the auxiliary piston (404) and the control piston (402), wherein the diaphragm completely separates the auxiliary piston and the control piston, and wherein the auxiliary piston is not rigidly attached to the control piston; and a plurality of spaced part tabs (405) extending radially out from the auxiliary piston (404), engaging the piston bore (413), and aligning the auxiliary piston (404) within the piston bore (413).