SAFETY VALVE FOR WATER HEAT SUPPLY SYSTEM Russian patent published in 2007 - IPC F16K17/168 

FIELD: valving systems.

SUBSTANCE: safety valve comprises housing made of a sleeve with cylindrical side. The outer side is provided with the thread for setting the valve. The bottom of the sleeve is provided with the seat having sealing collar for cooperation with the sealing member made of a flexible material. The sealing member is mounted in the valving member set inside the housing. The valving member is made of the rod with piston. The piston is mounted at the end of the rod facing the seat. The ring groove made in the side of the piston receives the sealing ring for sealing the space between the cylindrical side of the piston and inner cylindrical side of the housing. The section of the rod projecting out of the housing is provided with the thread. The control nut is set on the rod from the side of its end projecting out of the housing coaxially to the cylindrical surface of the housing. The spring is interposed between the control nut and piston. The rod is provided with dummy axial opening that is connected with the inner space of the valve housing through radial openings. The radial openings are made in the side of the piston between the sealing ring and sealing member. The sealing member is set in the ring groove made in the face of the piston. The ring slot opening for by-pass of fluid to the dummy opening connected with the ambient when valve is opened is interposed between the side of the piston and inner side of the housing within the section of the piston between the radial openings. The outer diameter of the slot opening ranges from 1.05 to 1.1 of its inner diameter.

EFFECT: enhanced reliability.

1 dwg