VALVE Russian patent published in 1994 - IPC

FIELD: hydraulic engineering. SUBSTANCE: closing member in the form of upper pressure element and lower circular elements installed on common rod interact with contact surface of seat. Part of rod carrying sealing elements is resilient and can be flexibly deformed in a radial direction from valve axis. This part of rod has a minimum stiffness portion disposed between sealing elements installed on rod with a provision for limited axial displacement. Positioned in the space between them is easily deformable flexible circular sealing gasket. Surfaces of elements interacting with gasket are conical with conicity arranged opposite the gasket. These surfaces may be spherical with their convexities directed towards the gasket or congruent to one another. The gasket is made of a material with a low coefficient of friction. EFFECT: improved design. 4 cl, 4 dwg