1" MVA Zone Valve, four-wire Zoom

1" MVA Zone Valve, four-wire


Brand: Uponor (Wirsbo)

Uponor (Wirsbo)
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Type: Zone Valve
Size: 1"
Connection Type: Sweat
Flow Capacity (Cv): 7
End Switch: Yes
Body Pattern: 2-Way
Application: Zoning
Max Ambient Temp (°F): 104°F at 239°F water temp
Max Water Temp (°F): 239°F
Max Pressure (PSI): 125 psi
Max Close-Off PSI: 17.5 psi
Material: Bronze
Operating Voltage: 24 VAC Nominal
Operating Current: 250 mA
Time to Close: 3 to 4 seconds
Motor: Synchronous motor
Time to Open: 10 to 12 seconds
End Switch: 24 VAC
5 amps resistive
3 amps inductive
Wiring: Four-Wire
12" Leadwires
Position: Normally Closed
Weight (lbs): 2.4 lbs
Type: Motorized

Description for Uponor (Wirsbo) A3070526

Four-wire Zone Valve (24 VAC) features 3/4- and 1-inch sweat connections. It provides flow control for a single-zoned manifold (manifold serving one zone), and has a built-in flow-balancing feature. The zone valve includes end switch for activation of relay (pump), heat plant or other auxiliary devices. Do not mount actuators upside down.

1" MVA Zone Valve, four-wire


by PowerReviews
Uponor (Wirsbo)3/4" MVA Zone Valve, four-wire

(based on 1 review)

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Reviewed by 1 customer

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(1 of 1 customers found this review helpful)


trouble-free and reliable

By Rich

from Westerlo, NY

Verified Buyer



      Best Uses

        Comments about 3/4" MVA Zone Valve, four-wire:

        I use this valve to control the heat in the zones in my house... works great. [...]

        • Primary use:
        • Personal

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        Q&A: Ask the Questions, share answers

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        get answers from real customers and in-house experts with AnswerBox.

        2 Questions | 6 Answers
        Displaying questions 1-2
        • 3/4" MVA Zone Valve, four-wire


          Is this valve normally closed only or can it be switched to normally open?

          Is this valve for closed loop systems only?
          Asked on 5/19/2012 by Karl

          5 answers

          • CUSTOMER CARE


            The MVA is normally closed only. The valve can be used in a closed or open loop system.

            Answered on 6/7/2012 by PexSupply Staff from NY
          • VERIFIED BUYER


            It opens the manifold seat with a 24 volt signal with a spring closed return
            when power is taken away. So power only opens it, power can't close it. The
            end switch has "dry" normally open/closed terminals. It is wired for
            normally open. You have to do some soldering if you want to change it. You
            can use it for closed or open systems. Note: These valves have problems with
            the end switches malfunctioning over time.

            Answered on 5/19/2012 by Anonymous
          • VERIFIED BUYER


            Normally closed. I think it should work with any system.

            Answered on 5/19/2012 by Anonymous
          • VERIFIED BUYER


            No it can not be switched... It is what it is.
            Sent from my iPhone

            Answered on 5/19/2012 by Anonymous
          • VERIFIED BUYER


            Sorry second question... It is a valve, as far as I know it does not care if the loop is closed or open... It's going to open or close with out being influenced by the design of the system. As long as you have a 24volt control circuit.
            Sent from my iPhone

            Answered on 5/19/2012 by Anonymous
        • 3/4" MVA Zone Valve, four-wire


          how to wire this zone valve? what if it's mounted upside down?
          Asked on 10/8/2010 by gedas from nj

          1 answer

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