| 摘要 |
<p>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.</p> |
