SELF-CLOSING VALVE Russian patent published in 1994 - IPC

FIELD: valving. SUBSTANCE: aperture is secured between top and bottom parts of a combined cover. The above-aperture chamber is connected with a control member. A valve member with through opening, which communicates the opening with a space between the bottom part of the cover and the valve member, is mounted between the bottom part of the cover and the case. The bottom part of the cover is provided with a through opening wherein a piston coupled with the aperture is positioned. A drain passage communicates outlet opening with the through opening. The top part of the cover is provided with a check valve. The aperture is spring- loaded with respect to the top part of the cover provided with a throttle opening which communicates the above- aperture space with the atmosphere. The control member is made of a chamber with alternative volume. The under- aperture space is in communication with the atmosphere. EFFECT: enhanced reliability. 1 dwg