Freeze drain valve

Details Freeze drain valve Freeze drain valve

1980-01-28

1981-10-27

Schwadron, Martin P.

Fluid handling

Freeze condition responsive safety systems

Low temperature responsive drains

60527, 236100, 237 80, 251 11, 251 77, 251 85, F16K 1700, G05D 2302

Patent

active

042967708

ABSTRACT:
A temperature responsive drain valve (10) is disclosed for draining fluid lines (12) to prevent freeze up damage. The valve includes a housing (14) having a fluid passageway (15) therethrough. A temperature responsive thermal actuator (20) is mounted to the housing adjacent fluid inlet passageways (34). The actuator includes a temperature sensitive portion (22,23), which extends exteriorly of the valve housing and an output member which extends into the fluid passageway. A poppet valve member (42) has a self-aligning valve surface (46) and is mounted in the fluid passageway and biased toward a valve seat by a conical spring (47) which extends over a cylindrical portion (43) of the valve member. Cylindrical portion (43) is also guided by and extends through an opening (49) in a reaction plate (48). An outer biasing spring (51) reacts against the output member through a cage arrangement (54, 58, 67). A flexible bead chain (62) is connected between valve member (42) and the cage arrangement and functions as a lost motion connection, thereby allowing the output member of the thermal actuator to move outwardly toward the poppet valve member without overloading the valve member and thermal actuator.

REFERENCES:
patent: 1338469 (1920-04-01), Waage et al.
patent: 2085876 (1937-07-01), Steen
patent: 2130796 (1938-09-01), Grayson
patent: 3118648 (1964-01-01), Campbell
patent: 3446226 (1969-05-01), Canterbury
patent: 3860169 (1975-01-01), Norman
patent: 3887159 (1975-06-01), Obermaier et al.
patent: 4036433 (1977-07-01), Wagner et al.
patent: 4066090 (1978-01-01), Nakajima et al.

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