JPS566965A - Valve - Google Patents

Abstract

PURPOSE: To provide a valve for an unhardened concrete pump, which has a valve port of a large cross-sectional area and a low fluid resistance, by designing the valve in such a manner that a valve port defined by complementary valve members are opened and closed in accordance with the folding movements of a bendable plate, and providing cylindrical members of a flexible material between a valve port edge and the inner circumferential surface of a fluid passages.

CONSTITUTION: A valve casing 1 is provided in fluid passages 2, 4. The valve casing 1 has a through bore 3 in which a valve body 5 is held at mount portions 14 thereof. When a bendable plate 8 of the valve body is folded at folding portions 7 thereof, complementary bendable valve members 10, 10 are folded at their respective first and second fold lines 11, 12, so that a valve port 9 is opened. Cylindrical members 15, 16 of a material having high wear-resistance and flexibility are bonded at their respective mouth edges 15a, 15b, 16a, 16b to port edges 13 of the valve members 10 and an inner circumferential surface of the valve casing 1. Spaces between the cylindrical members 15, 16 and the inner circumferential surface of the valve casing 1 is filled with a liquid. When a fluid is supplied into the passage 2, the bendable plate 8 and bendable valve members 10 are folded by the pressure of the fluid to open the valve port 9. When the supplying of the fluid is stopped, the plate 8 and valve members 10 are returned to the original positions by the backward pressure of the fluid to close the valve port 9. Thus, a valve having a valve port of a large area, a low fluid resistance and a high durability and used to carry a solid-liquid mixed fluid can be obtained.

COPYRIGHT: (C)1981,JPO&Japio