4021 - 3 Way Thermostatic Valve

Features

● 2 OR 3-WAY VALVE ACTION

● 3-WAY VALVE HAS BALANCED FORCE DESIGN-PRESSURE CAN BE APPLIED TO ANY PORT

●3-WAY VALVE IS SUITABLE FOR LP GASES, NATURAL GAS, OIL, AIR ETC.

● BUBBLE-TIGHT SEALS

Applications

● TEMPERATURE SENSING

● PNEUMATIC SAFETY SYSTEMS

● FLOW LINES

● WELL HEAD TEMPERATURE

Operation

AMOT Model 4021 is a 3-way control valve for limiting or sequence function service. It is used to sense the temperature of engine cooling water, lubricating oil, high pressure gas, or other fluids between 75°F and 225°F. Extensions are available to accommodate installation depths up to five inches. Stainless steel wells are also available. The 4021 is set at the factory so that the center Port 2 will just open to Port 1 and trip an AMOT Model 2400 Indicating Relay at the specified set temperature on the temperature rising cycle. In order to avoid a no-flow possibility on certain safety control applications, the valve is equipped with a spool which produces "Valve Port Overlap" at the center of the stroke. At this point, all ports are open to each other. As the spool travels slightly farther, Port 3 will close, and port 1 will remain open to Port 2.

For special applications in which "Valve Port Overlap" is not desired, a special feature is available called "Center Dead Spot". In this case a special spool is furnished. Below the temperature set point, Port 3 is open to Port 2 with enough capacity to trip an AMOT Model 2400 Indicating Relay. Because the valve has a " Center Dead Spot ", Port 3 will close to Port 2 just before Port 1 opens to Port 2 on rising temperature.

The temperature sensing element should not be ex-posed continuously to temperatures exceeding 50° F above the temperature setting. For occasional short periods such as 1/2 hour, exposure to 75° F above the temperature setting, but not exceeding 250° F can be tolerated.

Specifications

Maximum Control Pressure................................125 psi
Valve Flow Capacity above
and below center position.....................Cv Factor = 0.7

Materials

Valve Body............................................Aluminium
Valve Spool...........................................Aluminium
Valve Seals.................................................Bura N

Temperature Sensing End

a. Threaded Adapter for Temperature Sensing elementPlated steel
b. Temperature Sensing element.........Brass Extensions....................................................Brass