2470 - 2-Way Valves

Features

● 2-WAY VALVE

● EXTERNAL SENSING

● FOR LIQUID OR STEAM SERVICE

● OPEN OR CLOSE ON RISING TEMPERATURE

● TAMPER-PROOF TEMPERATURE SETTINGS 70°F TO 250°F

● CONSERVES WATER AND STEAM

Applications

● LUBE OIL SYSTEMS

● COGENERATION HEAT RECOVERY SYSTEMS

● PROCESS CONTROL

Operation

AMOT Model 2470 is a 2-way self-actuated temperature regulating valve with external sensor. The valve senses temperature via an expanding-wax element, located external to the valve body. Flow through the valve is modulated or shutoff in response to the temperature sensed by the element which may be located in the fluid circuit being controlled (Figure 2), or in a separate fluid circuit, as in remote sensing applications (Figure 3).

The valve will either open or close on rising temperature, depending on configuration selected. The highly reliable expanding wax-element encased in bronze retaining cup produces exceptional valve travel per unit of temperature change. Metal seats and O-ring seal of ethylene propylene rubber minimize leakage in steam applications.

Body housing of cast iron with bronze seats and sliding valve, and stainless steel element adapter provide rugged performance. When the sensed circuit is corrosive or fluid containment is necessary, stainless steel wells are avail-able. Extended insertion lengths are also available, see Table D.

MODEL 2470B(-)1 This valve opens as the sensed temperature rises above the set point, and closes as temperature falls. Valve seat of Buna-N rubber can withstand 125 psi liquid pressure in closed position. Commonly used in cooling water control, as shown in Figure 2.

MODEL 2470B(-)2 This valve closes as the sensed temperature rises above the set point, and opens as temperature falls. Metal-to-metal bronze seat will handle up to 50 psi saturated steam or 80 psi liquid pressures. The valve will function to 125 psi maximum liquid pressure, but shutoff will not be leak-tight. Commonly used in heating applications, see Figure 3.

MODEL 2470B(-)3 This valve operates the same as the 2470B(-)2 except it has Buna-N rubber seat which will seal leak-tight up to 125 psi in liquid heating applications.

To obtain maximum long life from the temperature element, the valve must not be operated continuously at more than 50 F above the opening point on the 2470B(-)1; or more than 30 F above the closing point on the 2470B(-)2 and 2470B(-)3. If it is necessary to operate at a continuous over-temperature, the factory should be consulted for alternate elements. The available valve opening and closing ranges are shown in Table C. Limited field adjustment of temperature setting can be achieved by turning the Adjusting Nut (14) located inside the valve. If a different temperature range is required after initial use of the valve, the Temperature Element (5) must be changed and the valve re calibrated. If the valve gives an indication of sticking or binding, check O-ring (2) for excessive swelling and replace if necessary.

Specifications

Housing (1)........................................................ Cast Iron
Internal Parts ........................................................ Bronze
Temperature element (5) & Extensions (11) ........... Brass
Adapter Assembly (3)............................... Stainless Steel
Dynamic Seal (2)...................................................... EPR
Maximum Pressure on Element ........................... 800 psi
Maximum Pressure on Well .............................. *5000 psi
Flow Coefficient, Cv .................................................. 13.5

Maximum Shutoff Pressure
2470B(-)1 ......................... 125 psiLiquid
2470B(-)2 .......................... 50 psi Steam
2470B(-)2 ........................... 80 psi Liquid
2470B(-)3 ......................... 125 psi
Liquid Net Weight ............................................... 4.6 lbs (2.1 kg)

* Pressure shown is maximum allowable. To obtain working pressure, factors of safety should be applied as required by appropriate codes or regulations. In certain adverse conditions, a corrosion or erosion allowance should also be made.