Armstrong The Brain® DRV Series (including models DRV25R, DRV40R, DRV50R, and DRV80R) are digital recirculation valves designed specifically to be the primary water temperature controller in a continuously pumped circulating hot water system. They are supplied with a recirculation manifold and feature four thermistors integral to the mixing valve body that measure the cold water inlet, hot water inlet, mixed water outlet, and over-temp safety temperatures.

Digital technology provides enhanced water temperature control accuracy which resists zero system demand "Temperature Creep" without the use of a manual throttling valve or a temperature activated pump shut-off device (aquastat). The completely integral digital valve requires no external or ancillary components such as actuators, sensors, or controllers.

Operational Specifications

• +/-2°F DRV water temperature control at peak, moderate or zero fixture demand on hot water systems designed for continuous recirculation.
• 1°F minimum recirculating water temperature differential.
• Programmable set point range of 81-158°F (27-70°C) capable of BAS or mobile monitoring and adjustment.
• Programmable thermal disinfection range of 158-185°F (70-85°C).
• Programmable 1st level hi/lo temp alarm display capable of BAS or mobile alerting.
• Programmable temperature error level for safety shutdown.

Safety Features

Automatic safe closure of the hot water inlet occurs in response to inlet supply failure, 110V power failure, or programmable high temperature error. This automatic safe closure is powered by a replaceable lithium battery monitored for low-level alerting.

Technical Specifications

• Power: 100-240V AC
• Enclosure: Polymer Electronics Enclosure (NEMA 3S)
• Valve Construction: 316L Stainless Steel mixing valve body and proportioner
• Compliance: Lead Free compliant; Conforms to ASSE 1017, CSA B125.3-11, UL E357437, and CE
• Maximum Inlet HW Supply Temperature: 185°F (85°C)
• Operational Water Pressure: 10-150 psig (0.7-10.3 barg)
• Display: LCD display indicating set point, delivered temperature, error codes, and alarm conditions (in °C or °F)

Connectivity

The DRV Series features an RS485 Serial Port with integral MODBUS RTU for direct connectivity to BAS. It offers seamless integration with SAGE® (BS) connectivity options. SAGE® (BS) modules are available with specific ProtoCessor cards for BAS Connectivity to systems which operate on Modbus TCP, BACnet™, or LonWorks™ protocols.

Mobile Connectivity features smart hot water system dashboard monitoring, secure remote programming, multi-location view, temperature and system diagnostic alerts, with unlimited digital documentation and automated report generation.

Model Specifications & Performance

DRV25R

• Connections: 1" inlets and outlet
• Minimum Continuous Recirculation: 2 GPM (7.6 LPM)
• Shipping Weight: 17 lbs (17.1 kg)

Model DRV25R	Pressure Drop (PSIG)				Minimum System Draw-Off	$C_v$
	5	10	15	20
GPM	22	31	39	45	0	9.8

Model DRV25R	Pressure Drop (BARG)				Minimum System Draw-Off	$K_v$
	0.3	0.7	1.0	1.4
LPM	81	118	145	171	0	8.5

DRV40R

• Connections: 1.5" inlets and outlet
• Minimum Continuous Recirculation: 5 GPM (19 LPM)
• Shipping Weight: 32 lbs (14.5 kg)

Model DRV40R	Pressure Drop (PSIG)				Minimum System Draw-Off	$C_v$
	5	10	15	20
GPM	48	70	85	98	0	22

Model DRV40R	Pressure Drop (BARG)				Minimum System Draw-Off	$C_v$
	0.3	0.7	1.0	1.4
LPM	181.7	265.0	321.8	371.0	0	22

DRV50R

• Connections: 2" inlets and outlet
• Minimum Continuous Recirculation: 10 GPM (38 LPM)
• Shipping Weight: 67 lbs (31 kg)

Model DRV50R	Pressure Drop (PSIG)				Minimum System Draw-Off	$C_v$
	5	10	15	20
GPM	94	133	163	188	0	42

Model DRV50R	Pressure Drop (BARG)				Minimum System Draw-Off	$C_v$
	0.3	0.7	1.0	1.4
LPM	355.8	503.5	617.0	711.7	0	42

DRV80R

• Connections: 3" inlets and outlet
• Minimum Continuous Recirculation: 10 GPM (38 LPM)
• Shipping Weight: 84 lbs (38 kg)

Model DRV80R	Pressure Drop (PSIG)				Minimum System Draw-Off	$C_v$
	5	10	15	20
GPM	94	133	163	188	0	42

Model DRV80R	Pressure Drop (BARG)				Minimum System Draw-Off	$C_v$
	0.3	0.7	1.0	1.4
LPM	355.8	503.5	617.0	711.7	0	42