Valve for high pressure gas cylinders

A valve for high pressure gas cylinder of the type consisting of a valve-body (2) terminating at the bottom with a threaded connection (3) whose internal duct (3a) opens into a circular chamber (4) the “roof” of which is provided with a central hole (8) forming the inlet of an overlying ascending duct (9) that opens at the top into a cylindrical chamber (10), formed on the valve-body (2) and sealed by a cap (11) screwed on the exterior of said cylindrical chamber (10), in which a piston (12) is housed, sealed and slides, wherein a rod (13) thereof is fitted and guided within the axial duct (9) and supports, at its bottom end, a shutter plate (14) fitted with a gasket (14a) that hermetically seals the inlet hole (8) of the overlying duct (9) thanks to the traction of a return spring (15) fitted on the rod (13) that constantly exerts a lifting thrust on the piston (12):

• a—a valve characterised in that:
• a radial branch (9a), that supplies a gas outlet connection (21), is provided along duct (9);
• b—a hole (22), that opens externally into a threaded seat where a refill valve (23) is screwed, is provided along duct (3a);
• c—three holes (5, 6 and 7), staggered by 90°, are provided along the lateral wall of said chamber (4), wherein:
• the first hole (5) forms a housing and sliding seat of a plug (16) on the back of which is fitted a gasket (16a) and a pin (16b) sealing a small hole (17a) that opens externally at the centre of a connection (17) on which a valve opening actuator is mounted and which intercommunicates by means of a duct (18) with a space (18a) between the cap (11) and the piston (12);
• wherein a nipple (6a) for pressure switch (19) is screwed into the second hole (6);
• wherein a pressure gauge (20) is fitted into the third hole (7).