Fluid flow control rotary valve

Details Fluid flow control rotary valve Fluid flow control rotary valve

1996-12-30

1999-04-06

Fox, John

Valves and valve actuation

Rotary valves

Plug

251367, F16K 504

Patent

active

058906991

ABSTRACT:
An inner periphery of a housing 1 supports a rotary shaft rotatably via a pair of bearings 3, and a valve body 5 which is secured to the rotary shaft 4 changes at least one opening area of an intake port 19 and an outlet port 14 formed in the inner periphery. A biasing member 25 biases the bearings in a one-way direction. Therefore, the valve body 5 is moved or biased by the biasing member to the inner periphery of the collar 2 via the bearings, thereby decreasing leakage in the valve when closing. Therefore, even if difference of the thermal expansion coefficient between the housing 1 and the valve body 5 is significant, the leakage can be decreased, thus increasing variety of the material choice. In addition, even if the difference of the thermal expansion coefficient between the housing 1 and the ball bearings is significant, the bearings may not become loose due to expansion of the collar 2, therefore the housing may be selected from various kinds of material including resinous material.

REFERENCES:
patent: 4494517 (1985-01-01), Kratt et al.
patent: 5251663 (1993-10-01), Christianson et al.

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