Spool

Details Spool Spool

1998-02-23

1999-08-10

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

251324, 277586, F15B 1304, F16K 324

Patent

active

059343230

ABSTRACT:
It is an object of this invention to reduce air resistance, which occurs when a packing is mounted in the mounting groove of a spool. Reducing this air resistance facilitates the mounting operation and prevents compressed air from being contained in a groove bottom space, and thus prevents the packing from floating. To achieve this object, a packing mounting groove 14 consisting of a wide portion 14a and a narrow portion 14b is formed in a seal land 13 in the spool. In addition, a packing 11 includes on both sides of its second portion 11b, which is fitted on the narrow portion 14b, a seal lip 18 that contacts the groove wall of the narrow portion 14b in a gas-tight manner such that air is prevented from flowing into the groove bottom. Furthermore, a lip width (f) representing the distance between both seal lips 18 and 18 under a non-seal condition is set the same as or smaller than the width (a) of the wide portion 14a of the mounting groove 14.

REFERENCES:
patent: 5513674 (1996-05-01), Frisch
patent: 5609343 (1997-03-01), Asou et al.

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