Electronic expansion valve

Details Electronic expansion valve Electronic expansion valve

1985-09-19

1986-06-10

Lyddane, William E.

Valves and valve actuation

With material guide or restrictor

Valve at point of greatest restriction

251264, 251282, 25112911, 62204, 62210, F16K 4700, F25B 4104

Patent

active

045938814

ABSTRACT:
An electronic expansion valve comprising a stepping motor, motion conversion member for converting the rotational motion of the stepping motor to a screw motion, a valve pintle coupled to the motion conversion means to be rectilinearly displaced and having pistons at both ends of the valve pintle, of which the pistons are slidably supported on valve casing members, a valve body formed as an integral part of the valve pintle at an intermediate portion thereof, and a valve seat which has such an outer surface that when the valve pintle is displaced with respect to the valve seat in either direction, the cross sectional area and the shape of a passage defined between the valve seat and the valve pintle are smoothly varied. The valve can be used in refrigeration cycle with a compressor. Stable operation of the refrigeration cycle is obtained. The orifice contour created by a moving valve body and a valve seat is always maintained streamlined so that the friction loss therethrough is substantially reduced, whereby the coefficient of performance of the refrigeration cycle is improved.

REFERENCES:
patent: 2534455 (1950-12-01), Hilkemeier
patent: 3180260 (1965-04-01), Pavlin
patent: 3421700 (1969-01-01), Seamans
patent: 3699989 (1972-10-01), O'Connor
patent: 3756282 (1973-09-01), Knutson
patent: 4084120 (1978-04-01), Lund

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