Dwyer 38R系列自力式温度调节阀

Series 38R Self-Acting Temperature Control Valves require no external power sources and are ideal for regulating the temperature of tanks, process streams and various types of industrial equipment. The actuators are made with a rugged die-cast aluminum housing with a fully enclosed bellow assembly and internal over-range protection. Valves are offered in 1/2" through 6" connection sizes and 1/8" through 6" port sizes. The valve bodies are available in single-seated direct or reverse-acting, double-seated direct or reverse-acting, and 3-way designs with four choices of body material: bronze, cast-iron, cast steel, and 316 stainless steel. Actuators are available with or without indicating dials or in Fail-Safe. Non-indicating actuators feature a lower profile and should be implemented where space constraints may be an issue while the indicating actuator allows the operator to verify the process temperature and aid in temperature adjustment. Fail-Safe actuators are designed to cause the valve to fail in the safe control position (open in cooling application, closed in a heating application) should some accidental damage occur to the terminal system, resulting in loss of pressure charge. Also available with the Series 38R are a wide range of capillaries, bulbs, and thermowells.Dwyer 38R系列自力式温度调节阀

ACTUATORS
Power Requirements: Fully self-contained, no external power required.
Indicator: 3-1/2? dial thermometer, stainless steel case, swivel and angle adjustable (available for Indicating Actuator only).
Housing: Die cast aluminum, epoxy powder coated blue finish.
Set Point Scale: Integral to housing.
Bellows: High-pressure brass, corrosion resistant, tin-plated finish.
Adjustment Screws: Brass.
Range Adjustment Spring: Cadmium plated.
Overrange Protection: 100°F over upper range limit for temporary situations (not available for Fail-Safe actuators). 
Weight: See dimensional drawing. Dwyer 38R系列自力式温度调节阀