Diaphragm-type pilot valve having a self-cleaning control orific

Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing

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Details

251 3104, 251 3005, 251 40, 251 45, F16K 31385, F16K 31145, F16K 3140

Patent

active

054562791

ABSTRACT:
A reaming pin (70) is provided in a control orifice (34) by which pressure from a main chamber (26) is communicated to a control chamber (36) so as to provide force to hold a main valve member in the form of a flexible diaphragm (12) against a valve seat (14) and thus prevent fluid from flowing from the main chamber (26) to an outlet orifice (32). The control orifice (34) is displaced from the center of the diaphragm (12), but the reaming pin is so provided as to cause the variation in the lateral spacing between the pin (70) and the control-orifice walls to be less than it would be if the reaming pin were a straight, inflexible member rigidly mounted perpendicularly to the plane of the valve seat (14). In one version, the pin (70) is mounted on the diaphragm (12) itself and thus moves laterally with it. In another version, the pin (70') is pivotably mounted on the valve body so as to permit such motion. Alternately, the pin (70"')can be made flexible enough that such lateral motion in the pin results from engagement with the control-orifice walls without causing binding. In another version, the pin (70") can be so curved as to reduce the lateral-spacing variation that results from diaphragm motion.

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