TRV1 and TRV2 3-way Control Valves

About this product

TRV control valves series are especially designed for heat exchangers control where the flow rate of the heating fluid which enters the heat exchanger is changed by the temperature controller. As outlined in the sketches of Fig. 1 and 2 both the two methods used for this process switch-off the flow rate into a by-pass line around the exchanger. In the layout of Fig.1 the valve is the diverting type TRV1 with one inlet and two outlets while in the arrangement of Fig 2 the valve is the mixing type TRV2 with two inlets from heat exchanger and by-pass. The use of the by-pass around the exchanger limits the changes of pressure in the main line with many benefits for the assisted final equipment (boilers, headers, etc.). Fig.1 - DIVERTING TYPE 3-way control valve in heat exchanger application Fig.2 - Mixing type 3-way control valve in heat exchanger application TRV Design In both designs the fluid tends to open the plug to ensure the max stability to the valve operation. The selection between the two solutions is basedprincipally on fluid temperature and on the differential temperature T1-T2 across the exchanger. TRV1 diverting type is generally preferred for high AT(120° and over) but when T1 exceeds 350℃ (up to 450℃) mixing type TRV2 is preferred. Generally, mixing type is preferred as it is less expensive and due to easier maintenance. Technical characteristics: TRV2 Control Valve 12" ANSI 600 (mixing type) TRV2 TRVI