Abstract: A coolant control valve, including: a housing with a first port and a second port; a primary rotary valve disposed within the housing and including a primary body; and a secondary rotary valve disposed within the housing and including a secondary body. The primary rotary valve and the secondary rotary valve are rotatable around the axis of rotation by at least one actuator to a first configuration. In a first configuration of the primary rotary valve and the secondary rotary valve around the axis of rotation: a first straight line, orthogonal to the axis of rotation, passes through the primary body and the first port; and a second straight line, orthogonal to the axis of rotation and co-planar with the first straight line, passes through the secondary body and the second port.

Abstract: The invention concerns a thermostat valve for a combustion engine, comprising a housing, which has several cooling fluid connections, and comprising at least one first hollow valve element, which has a spherical or spherical-segment shaped shell surface and is mounted rotatably in the housing, wherein the at least one first valve element comprises several openings limited by the shell surface, which openings can be selectively connected with one or several of the cooling fluid connections of the housing by rotation of the at least one first valve element, wherein at least one second valve element is provided which is rotatable in the housing relative to the at least one first valve element, wherein the at least one second valve element can selectively close or open one or several of the cooling fluid connections of the housing through rotation, and wherein a rotational drive is provided, with which the at least one first valve element and/or the at least one second valve element can be driven rotatably.

Abstract: A pulse tube refrigerator with an automatic gas flow and phase regulating device is composed by a helium compressor, an air distribution valve, a drive controller, a drive lead, a temperature sensor, a temperature measuring lead, a heat regenerator, a first-stage pulse tube, a second-stage pulse tube, a first-stage air reservoir and a second-stage air reservoir, wherein the air distribution valve is consisted of eight independent valves. According to received temperature signals from the temperature sensors the drive controller transmits order signals to the eight independent valves so as to control the open/close degree, time and sequence of the eight valves of the air distribution valve.

Abstract: The problems of reducing the torque required to turn the valve, eliminating wear dust, and extending the life of the valves in Gifford McMahon (G-M) type multi-port pulse tube refrigerators are solved by using a rotary spool valve having radial clearance to control flow to and from the regenerator, and using face seal ports on the end of the spool to control flow to and from the pulse tubes.

Abstract: An airflow control valve for a clean room having a duct section with a damper positioned within the duct. The damper being capable of an adjustment from an open position to a closed position. The opening and closing of the duct is accomplished through a magnetic coupling such that the duct can remain sealed during operation. The airflow control valve includes a sensor for measuring the airflow rate, so that the duct can be adjusted to maintain one or more predetermined flow rate set-points.