Knife gate valve
US4377274A · kind A · utility
Inventor
Key dates
| Filing date | Nov 10, 1980 |
| Grant date | Mar 22, 1983 |
| Priority date | — |
| Expiry date | Nov 10, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/0281
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A knife gate valve (10) comprises an elongated, relatively-flat rigid frame (16) having two rigid side plates (24 and 26) being spaced from one another. A relatively-resilient valve liner (14), forming a valve seat about a liquid flow passage (22) through the frame (16) is insertable into the frame (16) from a first end of the frame so that the liner (14) can be replaced without detaching the gate valve from a fluid system with which it is used. The valve liner (14) has a slot (45) extending into the valve liner from the first end for receiving a gate blade (12). In the preferred embodiment, rigid shields (32) are attached to the frame side plates (24 and 26) about the liquid passage (22) and extend into the liquid passage (22) beyond outer side faces of the liner (14). The liner is made in the form of three inserts which can be positioned within a cavity (31) formed by the shield and frame from the first end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.