Model H - Thermostatic Valves

Features

● FLOW RATES OF 345 - 1350 USGPM

● TAMPER-PROOF TEMPERATURE SETTINGS OF 55°F TO 240°F

●COMBINATIONS AVAILABLE:
~ Steel Housings ~ 4", 5", & 6" Pipe Sizes
~ Flanged Connections

● POSITIVE 3-WAY VALVE ACTION

● COMPLETELY SELF-CONTAINED

Applications

● ENGINE & COMPRESSOR COOLING SYSTEM

● LUBE OIL SYSTEMS

● COGENERATION HEAT RECOVERY SYSTEMS

● PROCESS CONTROL

● TEMPERATURE MIXING OR DIVERTING

Operation

AMOT Model H Thermostatic Valves are fully automatic, 3- way fluid temperature controllers for diverting or mixing applications. They are used to provide reliable control of fluid temperatures in engine water jacket and lubricating oil cooling systems. These valves are suitable for process control and industrial applications where fluids must be mixed or diverted, 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 valves, Model H valves utilize fully enclosed, factory-set temperature element as-semblies which provide tamper-proof operation. To change a valve setting it is necessary to exchange the temperature element assembly.

Viton seals can be supplied for use in fluids which attack Buna N, such as phosphate ester and diester oils. With such oils, nickel plated element assemblies should be requested for protection of the bronze parts. Contact the AMOT factory for seal material recommendations for your specific fluid.

MANUAL OVERRIDE If desired, AMOT Model H thermostatic valves can be supplied with a Manual Override which allows the operator to force the valve to flow a portion or all the fluid through the cooler. On 5" and 6" sizes there is one Manual Override for each of the two thermostatic element assemblies.

HIGH RESISTANCE TO SHOCK AMOT 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.

Other AMOT Thermostatic Valves are available for water flow rates of 9-2800 USGPM.

The valve is supplied with the temperature element assem- bly 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 that approximately one half the total fluid flow passes throught the cooler at full load.

For long life, AMOT Model H Valves should not be exposed to continuous temperatures exceeding 25 F above their nominal temperature setting. For occasional short periods, such as one half hour, Model H valves can be exposed to temperatures of 50°F above their nominal temperature setting, but not to exceed 250 F.

To operate the optional Manual Override and force all of the fluid to flow through the cooler, remove Cap (17) and loosen Locknut (16). Turn the shaft counter-clockwise to its limit. To return the valve to its automatic mode, turn the shaft clockwise to its limit. Tighten the Locknut and replace the Cap. Model 4HM valves have one Manual Override and Models 5HM and 6HM have two each.

Specifications

Internal Trim Materials .............. Stainless Steel & Bronze
Standard Seal Material.......................................... Buna N
Max. Pressure Drop Across Valve ......... 20 psi (138 kPa)

Valve Pressure Rating
Steel Body ................150 lb Class, 230 psi (1586 kPa)
Steel Body ................300 lb Class, 655 psi (4516 kPa)

Net Weight
4H....................................150 lbs (68 kg)
5H, 6H ........................... 265 lbs (120 kg)