area surrounding the gas inlet orifice to prevent direct contact of high pressure inlet gas against the valve seat material and disposing of filter within a gas inlet orifice of the post valve to remove any solids entrained in of high pressure gas to prevent solids from contacting the valve actuator application_number US 61263403 A description in the first embodiment of the high pressure post valve described herein there is disclosed a method of manufacturing a post valve so that the seat ring is integrally formed thereon the seat ring is integrally formed on a lower end of the valve body with a gas cylinder connecting threaded extension extending therefrom this manufacturing procedure results in a post valve that provides no opportunity for gas to escape between the seat ring and the valve body the manufacturing process includes starting with round metal bar stock which is less expensive than the square or rectangular bar stock now used to machine the valve bodies and cutting or etching away the outer diameter of the round metal bar stock to create square or rectangular portions of the valve body the seat ring is turned or left to be circular the threaded extension also is turned to the proper diameter thereafter exterior holes such as the outlet orifice are created by side cuts or drill cuts next the interior sections of the valve body are machined and the threads are cut into the threaded extension because this manufacturing process starts with less expensive round bar stock the entire manufacturing process is cheaper than the traditional process which.