Diaphragm-type valve

A diaphragm valve comprising:

• a housing (4) having an inlet bore (6), an inlet passage (8), an outlet passage (10), an outlet bore (11) and a shut off valve attaching bore (16);
• the shut off valve attaching bore (16) including an intermediate transmission means accommodating space (25), a shut off valve chamber (9) and a shut off valve seat (20) in the mentioned order from an exterior of the housing (4)to an interior thereof and having an interior area into which a thrust screw member (17) having externally threaded portions (30), an intermediate transmission means (18) and a closure member (19) are in communication with each other in the mentioned order from the exterior;
• the shut off valve chamber (9) communicating with the inlet bore (6) through the shut off valve seat (20) and the inlet passage (8) as well as with the outlet bore (11) through the outlet passage(10);
• at least part of the closure member (19) accommodated in the shut off valve chamber (9);
• a diaphragm (21) having an outer peripheral portion and arranged between the intermediate transmission means (18) and the closure member (19), the diaphragm (21) partitioning the shut off valve attaching bore (16) into the intermediate transmission means accommodating space (25) and the shut off valve chamber (9), and hermetically sealing the shut off chamber (9);
• a valve opening spring (29) disposed in the intermediate transmission means accommodating space (25) and resiliently urging the intermediate transmission means (18) in a direction away from the shut off valve seat (20);
• a cylindrical push sleeve (22) arranged around the intermediate transmission means (18) and configured to push the outer peripheral portion of the diaphragm (21) to hermetically seal the shut valve chamber (9);
• and
• a presser cylinder (23) connected to the housing and engaging the externally threaded portions (30) of the thrust screw member (17) in a screw-thread relationship, the presser cylinder (23) being axially and linearly moveable in relation to the push sleeve (22), and configured to push the push sleeve (22) towards the diaphragm (21).