TRAC STYLE 'A' (FAILSAFE) TEMPERATURE REGULATOR

The TRAC Style ‘A’ (Failsafe) temperature regulator is a self sensing and self actuated temperature regulating valve which will automatically control liquid or steam flow through the valve in response to changes in the temperature of the controlling medium. The regulating valve requires no external source of power to operate the valve or to detect changes in the temperature of the controlling medium. The valve can be set to control at any temperature within the limits of the temperature range stamped on the nameplate.The standard ranges for Style ‘A’ (Failsafe) valves are provided with a 30 deg.F adjustable temperature span.

Failsafe is a term invoked by the military specification to differentiate this type of equipment from the standard (non-failsafe) design. It describes the failure mode which the system designer must consider as safest for the system. For most applications where the TRAC Style ‘A’ (Failsafe) Temperature regulator is specified, the valve is intended to fail cold. The failsafe temperature regulator will fail in the full open or full closed position (depending on valve action) with no means to adjust the valve to an intermediary position. If adjustment to an intermediate position after thermostatic element failure is a system requirement, then consider the TRAC Style ‘B’ temperature regulator

TRAC STYLE ‘A’ (FAILSAFE) VALVE ACTION:

DIRECT ACTING: Direct acting valves are used for heating services where a rise in temperature tends to close the valve. A direct acting valve is generally used for controlling the temperature of any steam heated systems such as hot water tanks, steam tables, sterilizing equipment, etc…
MIL-V-19772A / MIL-DTL-19772B TYPE II CLASS 1 (Failsafe)

REVERSE ACTING: Reverse acting valves are used for cooling services where a rise in temperature tends to open the valve. A reverse acting valve is generally used for controlling the temperature of cooling system recirculating lines, heat exchangers, environmental air cooling, etc…
MIL-V-19772A / MIL-DTL-19772B TYPE II CLASS 2 (Failsafe)

THREE WAY: 3-Way valves are used for mixing hot and cold liquids to deliver liquid to the outlet at a predetermined temperature, or to divert the inlet flow of liquid to a heat exchanger or bypass based on the controlling condition.
MIL-V-19772A / MIL-DTL-19772B TYPE I (Failsafe)

For more information on the TRAC Style ‘A’ product line:
TRAC STYLE ‘A’ CATALOG

For instruction on replacement of a TRAC Style ‘A’ thermostatic element:
TRAC STYLE ‘A’ THERMOSTATIC ELEMENT REPLACEMENT

For detailed maintenance instructions for Navy shipboard installations:
TRAC STYLE ‘A’ NAVY MANUAL S6435-J3-MMM-010
(This document is for official use only and distribution is controlled by the United States Navy. Copies of this document are not available online)