Kabushiki Kaisha Saginomiya Seisakusho

Hideki Sekiguchi

Takahito Hayashi

Yutaka Kaneko

Seiichi Nakano

Yasuo Komiya

Takashi Hirakawa

Tamami Fukuyasu

Tokuji Yatsui

There is provided an expansion valve which, by moving the sub-valve in a valve housing, controls the flow rate of a refrigerant in a first flow direction and releases the refrigerant to flow in a second flow direction, wherein the sub-valve is reduced in weight and a valve port is provided with high accuracy. The sub-valve includes a guide member formed by press work and a valve seat member formed by cutting. The sub-valve is seated on a sub-valve seat of a valve seat ring when the pressure in a main valve chamber is high, and is moved away from the sub-valve seat when the pressure in the main valve chamber is low. The sub-valve is reduced in weight by forming the guide member by press work, and the valve port is formed with improved accuracy by forming the valve seat member by cutting.

Expansion valve

A first expansion valve is provided in an outdoor unit, and a second expansion valve is provided in an indoor unit. A pipe line connects a first joint pipe of the first expansion valve and a second joint pipe of the second expansion valve. When a refrigerant flows in from the second joint pipe and flows out from the first joint pipe, the first and second expansion valves are in a full open state due to pressure of the refrigerant. When the refrigerant flows in from the first joint pipe and flows out from the second joint pipe, the first and second expansion valves are in semi-closed state (flow rate controlling state). In a cooling mode, the second expansion valve expands the refrigerant just before an indoor heat exchanger, and in a heating mode, the first expansion valve expands the refrigerant just before an outdoor heat exchanger. In both heating and cooling mode, a large amount of refrigerant flows through the pipe line to reduce pressure loss.

Expansion valve, heat pump type refrigeration cycle apparatus, and air handling unit

The present invention provides a motor-operated valve having no additional stopper for stopping the rotation of a rotor at fully open and closed states of the valve to allow a reduced number of parts of the valve and to prevent a noise otherwise generated by the abutment of the rotor against a stopper. The motor-operated valve includes a rotor having a shaft formed with an external thread The motor-operated valve also includes a needle valve element having a needle valve head at one end portion thereof and an internal thread engaging with the external thread at another end portion. The valve element has a joining portion for joining the valve head to the internal thread The motor-operated valve also includes a main valve body having a guide portion which stops the rotation of the valve element but allows the axial movement of the valve element. The shaft has an upper end supported by a supporting portion provided on a top wall of a valve housing while a lower end of the shaft is rotatably supported by a bearing secured to the main valve body.

Motor operated valve

Growing community of inventors

Sayama, Japan

Hideki Sekiguchi