Dwyer Series 38R

Series 38R Self-Acting Temperature Control Valve

Require No External Power

Self Acting Temperature ControlThe Dwyer 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.

 

Specifications

TWO-WAY BRONZE VALVE BODY
Single Seat 1/2″ to 2″
Wetted Materials: Body: bronze; Trim: 316 stainless steel; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded, malleable iron union ends.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).
TWO-WAY BRONZE VALVE BODY
Double Seat 3/4″ to 2″
Wetted Materials: Body: bronze; Trim: 316 stainless steel; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded, malleable iron union ends.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).

TWO-WAY CAST IRON VALVE BODY
Double Seat 2-1/2″ to 6″
Wetted Materials: Body: cast iron; Trim: 316 stainless steel; Packing: PTFE.
Trim Style: Modified linear.
Connection: Class 125 flanged.
Pressure and Temperature Limits: 125 psi (8.62 bar) @ 350°F (149°C).

TWO-WAY CAST STEEL VALVE BODY
Single Seat 3/4″ to 1″
Wetted Materials: Body: cast steel; Trim: 316 stainless steel; Packing: PTFE.
Trim Style: Modified linear.
Connection: Threaded.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).

TWO-WAY STAINLESS STEEL VALVE BODY
Single Seat 1/2″ to 2″
Wetted Materials: Body: 316 stainless steel; Trim: 316 stainless steel; Packing: PTFE.
Trim Style: Modified linear.
Connection: Threaded.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).

TWO-WAY BRONZE FAIL SAFE VALVE BODY
Single Seat 1/2″
Wetted Materials: Body: bronze; Trim: 316 stainless steel; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded, malleable iron union ends.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).

TWO-WAY BRONZE FAIL SAFE VALVE BODY
Double Seat 3/4″ to 2″
Wetted Materials: Body: bronze; Trim: 316 stainless steel; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded, malleable iron union ends.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 410°F (210°C).

THREE-WAY BRONZE VALVE BODY
1/2″ to 2″
Wetted Materials: Body: bronze; Trim: bronze; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded, malleable iron union ends.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 300°F (149°C).

THREE-WAY CAST IRON VALVE BODY
2-1/2″ to 4″
Wetted Materials: Body: cast iron; Trim: bronze; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Class 125 flanged.
Pressure and Temperature Limits: 125 psi (8.62 bar) @ 300°F (149°C).

THREE-WAY STAINLESS STEEL VALVE BODY
1/2″ to 2″
Wetted Materials: Body: 316 stainless steel; Trim: 316 stainless steel; Packing: PTFE; Union: iron.
Trim Style: Modified linear.
Connection: Threaded.
Pressure and Temperature Limits: 250 psi (17.24 bar) @ 300°F (149°C).

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.