Abstract: A pressure control valve is provided with a valve main body (10) having a valve chamber (15) with a valve seat portion (14), a refrigerant inflow port (11) and a refrigerant outflow port (12), and a pressure response element (30) having a diaphragm (20) defining an upper surface of a valve chamber (15) and driving a valve body (17) and a lid-like member (35) defining a sealed pressure chamber (25) together with the diaphragm (20) and having a concave portion (36), an inert gas having a thermal expansion coefficient not more than a predetermined value is enclosed within said sealed pressure chamber (25), and an internal volume of the sealed pressure chamber is set such that the valve body (17) comes to a full-open state when that the pressure of the valve chamber (18) becomes a predetermined pressure or more higher than the pressure at which said valve body starts opening.

Abstract: For downsizing, cost reduction, and better characteristic, a pressure control valve (1) consists of a valve main body (2) having a valve chamber (2a); a valve seat (2d) within the valve chamber; a valve body (3) moving close to and away from the valve seat; and a disc spring (11) for energizing the valve body toward the valve seat, the valve body moves away from the valve seat when force acting in a direction for moving the valve body away from the valve seat by pressure within the valve chamber exceeds elastic force of the disc spring, a dimension of the valve main body in a valve body movement direction is lessened by use of the disc spring, a manufacturing cost is reduced by use of the disc spring made for general purpose, and the disc spring is preferable for high-pressure control due to its high spring rigidity.

Abstract: A pressure control valve is provided with a valve main body (10) having a valve chamber (15) with a valve seat portion (14), a refrigerant inflow port (11) and a refrigerant outflow port (12), and a pressure response element (30) having a diaphragm (20) defining an upper surface of a valve chamber (15) and driving a valve body (17) and a lid-like member (35) defining a sealed pressure chamber (25) together with the diaphragm (20) and having a concave portion (36), an inert gas having a thermal expansion coefficient not more than a predetermined value is enclosed within said sealed pressure chamber (25), and an internal volume of the sealed pressure chamber is set such that the valve body (17) comes to a full-open state when that the pressure of the valve chamber (18) becomes a predetermined pressure or more higher than the pressure at which said valve body starts opening.

Abstract: There is disclosed a pressure control valve comprising: a valve body (10A) provided successively with, mentioning from the upstream side in the flowing direction of refrigerant, a refrigerant inflow port (11), a refrigerant introduction chamber (14), a valve seat (13) with which a rod-like valve (15) is retractably contacted, and a refrigerant outflow port (12); and a temperature-sensitive/pressure-responsive element (20) which is provided with a temperature sensitive chamber (25) for sensing the temperature of the refrigerant that has been introduced into the refrigerant introduction chamber (14) and is designed to drive the valve (15) in opening or closing direction in response to fluctuations of the inner pressure of the temperature sensitive chamber (25). The temperature-sensitive/pressure-responsive element (20) is integrally attached to the valve body (10A).

Abstract: In a pressure controlling valve 3 for causing deformation of a resilient member 32 by a pressure difference between a CO2 gas pressure in a sealed space (heat sensitive portion) corresponding to a refrigerant temperature and a high pressure of the CO2 refrigerant in the refrigeration cycle to open and close the valve, a volume ratio Vs/(Vs?Vo) of a total volume (Vs) of the sealed space when the valve is fully closed and a total volume (Vo) of the sealed space when the valve is fully open is greater than 1.9 or 2.4. To improve this volume ratio, a cavity 31d communicating with the sealed space is formed inside a displacement transmission member 31 coupled with the resilient member, or a recess portion 35a is formed in a cover member 35a, or a member communicating with the sealed space is connected.

Abstract: A pressure control valve to be integrated into a steam-compression type refrigerating cycle includes: a temperature-sensing cylinder for sensing the temperature of refrigerant on the outlet side of the gas cooler; a temperature-sensing pressure responding element provided with a temperature-sensing chamber communicating through a capillary tube with the temperature-sensing cylinder and designed to drive a valve body into a closed or open state in response to fluctuations of inner pressure of the temperature-sensing chamber; and a valve main body attached to the pressure responding element; wherein the temperature-sensing cylinder and the temperature-sensing chamber are filled with CO2 at a predetermined density and also with a bulking quantity of an inert gas, thereby enabling to adjust the pressure of refrigerant on the outlet side of the gas cooler in order to secure a maximum coefficient of performance relative to the temperature of refrigerant on the outlet side of the gas cooler.