Fujikoki Corporation

Kouhei Kubota

Takashi Mogi

Shigeki Ito

Ryo Matsuda

Shin Honda

Kurato Yamasaki

An expansion valve with an improved vibration isolation mechanism includes a valve body, a valve element, a biasing member that biases the valve body toward a valve seat, an actuation rod that contacts the valve element and presses the valve element in a valve opening direction against a biasing force of the biasing member, and a vibration isolating spring that suppresses vibration of the valve element. The actuation rod is inserted into an actuation rod insertion hole in the valve body. The vibration isolating spring includes a leg spring having a base portion and a plurality of leg portions extending from the base portion. The leg spring is arranged in the valve chamber such that a center axis of the leg spring is non-coincident with a center axis of the actuation rod insertion hole.

Expansion valve

It is an object of the present invention to provide an expansion valve with an improved ring spring. Accordingly, in the present invention, the expansion valve includes a valve body including a valve chamber, a valve element disposed in the valve chamber, a biasing member configured to bias the valve element toward a valve seat, an actuation rod that presses the valve element in a valve opening direction against a biasing force of the biasing member, and a ring spring disposed between an outer circumferential surface of the actuation rod and an inner circumferential surface of the valve body. The ring spring includes a ring portion, at least three elastic protrusion portions that protrude inward from the ring portion and contact the outer circumferential surface of the actuation rod, and at least one outward protrusion portion that protrudes outward from the ring portion and contacting the inner circumferential surface of the valve body.

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Tokyo, Japan

Kouhei Kubota