Model B - Thermostatic Valves

Features

● FLOW RATES OF 68 - 1200 USGPM

● TAMPER-PROOF TEMPERATURE SETTINGS OF 55(F) - 240(F)

● COMPLETELY SELF CONTAINED

● POSITIVE 3-WAY VALVE ACTION

● AVAILABLE IN CAST IRON, DUCTILE IRON, BRONZE, STEEL, AND STAINLESS STEEL

● 1-1/2" - 6" PIPE SIZES: FLANGED, AND THREADED CONNECTION

Applications

● ENGINE & COMPRESSOR COOLING SYSTEM

● LUBE OIL SYSTEMS

● COGENERATION HEAT RECOVERY LOOPS

●PROCESS CONTROL

●TEMPERATURE MIXING OR DIVERTING

Operation

AMOT Model B Thermostatic Valves are fully automatic, 3- way fluid temperature control valves for diverting or mixing applications. They provide reliable control of fluid tempera-tures in engine jacket water and lubrication oil cooling systems. These valves are suitable for process control and industrial applications where fluids must be mixed or di-verted depending on their temperatures. They may also be applied to cogeneration systems to control temperatures in the heat recovery loop assuring proper engine cooling and maximizing heat recovery.

TAMPER-PROOF - As with other AMOT thermostatic valve the Model B utilizes fully enclosed, factory-set temperature element assemblies which provide tamper-proof operation. To change a valve setting it is necessary to exchange the temperature element assemblies inside the valve.

HIGH RESISTANCE TO SHOCK - Model B thermostatic valves display excellent reliability even under extreme shocks or vibration and many models have been qualified to MIL-S-901 and MIL-V-19772.

MANUAL OVERRIDE - If desired, AMOT Model B thermostatic valves can be supplied with a manual override which allows the user to direct flows through Ports A and C. On valves equipped with the manual override option, there is one manual override device for each of the temperature element assemblies. To engage the manual override function, flip the lever(s) 180 degrees from "Auto" to "Manual" position.

The valve is supplied with the temperature element assem- blies factory-set to the nominal temperature setting. Tem- perature is sensed at Port A which remains open to Port B (bypass) until the fluid temperature reaches a point 5 - 10 F below the nominal setting. As the temperature continues to rise, the sliding valve moves to close off Port B and open Port C (connected to the cooler or heat exchanger) Port B is fully closed 8 - 10 F above the nominal setting. The valve continually modulates the fluid flow to maintain the nominal temperature. For optimum control, the system should be sized so about 1/2 the total fluid flow is passing through the cooler at full load.

For long life, AMOT Model B valves should not be exposed to continuous temperatures exceeding 25 F above their nominal temperature setting. For occasional short periods (1/2 hour or less), they can be exposed to temperatures of 5 F above their nominal temperature setting, but not to exceed 250 F maximum.

For higher over-temperatures, reduced stroke element as- semblies(5566X)areavailable. Theywillwithstandcontinu- ous temperatures of 60 F above their nominal temperature setting but add 30% to the valve pressure drop. Reduced stroke elements are not available in all temperatures.

SPECIFICATIONS

Internal Trim Materials..................................Bronze and Stainless Steel
Standard Seal Material.................................Buna N
Max. Pressure Drop Across Valve..............20 psi (1.4 Bar)
Valve Pressure Ratings at 250 (F)
Cast Iron, Ductile Iron, Bronze....................150 psi (10 Bar)
Cast Iron, Model BH......................................340 psi (23 Bar)
Steel, Class 150,...........................................245 psi (17 Bar)
Steel, Class 300,...........................................665 psi (46 Bar)
Stainless Steel Class 150,..........................228 psi (15 Bar)
Stainless Steel Class 300,..........................590 psi (41Bar)