3/4" N 36-M1 Water Service Vacuum Relief Valve Zoom

3/4" N 36-M1 Water Service Vacuum Relief Valve

SKU:0138458

Brand: Watts

Watts
0138458 has been discontinued.
Direct Replacement:
SKU: 0556031
Brand: Watts

Do not use this item for any installation or repair of potable water applications. This product does not comply with the "Safe Drinking Water Act," which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking). This item is for non-potable (non-human consumption) water applications only.

2

Specs

Size: 3/4"
Connection Type: Male NPT
Material: Brass

Description for Watts 0138458

Series N36 Watts Water Service Vacuum Relief Valves are used in water heater/tank applications to automatically allow air to enter into the piping system to prevent vacuum conditions that could siphon the water from the system and damage water heater/tank equipment. It consists of a brass body construction with NPT male inlet connection, and a protective cap. Series N36 has a low profile design, is tested and rated to ANSI Z21.22, and is CSA certified. It is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks, table top heaters, jacketed steam kettles, unit heaters, low pressure steam systems, and steam coil heaters. Maximum Working Pressure: 200psi (14 bar), Maximum Steam Pressure: 15psi (103.4 kPa).

3/4" N 36-M1 Water Service Vacuum Relief Valve

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by PowerReviews
Watts3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve
 
4.8

(based on 5 reviews)

Ratings Distribution

  • 5 Stars

     

    (4)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

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100%

of respondents would recommend this to a friend.

Reviewed by 5 customers

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Displaying reviews 1-5

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5.0

just what I needed

By gofish

from Fl

Verified Buyer

Comments about Watts 3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve:

half the price of the 3/4 one

 
5.0

Fantastic service

By Paul

from Bellmore, NY

Verified Buyer

Comments about Watts 3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve:

I ordered this at a jobsite in the afternoon and it was delivered the following morning. I will continue to recommend this company it provides great service.

 
5.0

Necessary valve.

By headstamp

from Carmel, NY

Verified Buyer

Comments about Watts 3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve:

This valve is a must for an Amtrol Boiler Mate to prevent possible damage while draining unit. It allows air to enter when a vacuum is present while draining tank. This prevents damage to polyethylene inner liner. Works perfectly.

 
4.0

Fix for solar panel "steam hammer"

By Solar Home Owner

from Monument, Colorado

Verified Buyer

Comments about Watts 3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve:

I used the vacuum breakers (one each) on two 4-panel solar hot water arrays located on a second-story rooftop to facilitate faster water drain-down.

Breakers effectively eliminated a steam bubble explosion from water flashing to steam at the top of the panels by allowing quicker drain back.

 
5.0

Specialized and Hard to Find

By BB

from McLean, VA

Verified Buyer

Comments about Watts 3/4"" LFN36M1 Lead Free Water Service Vacuum Relief Valve:

Required to protect a large retention tank (120 gal) in a water treatment system for a WV weekend home. Not available at the big box stores. Much better price than local plumbing stores. Very pleased with the price, product [...]

Displaying reviews 1-5

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Q&A: Ask the Questions, share answers

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1 Question | 5 Answers
Displaying question 1
  • Q:

    My new water heater states: "Install vacuum relief in cold water inlet as required". What is the purpose of this valve? What is the worse that could happen if I didn't install such a valve? My tank is a 50 gal tank.
    Asked on 10/23/2012 by Lyndon from United States

    5 answers

    • VERIFIED BUYER

      A:

      Hello PexSupply,
      The purpose of the vacuum relief valve is to prevent the the collapse of the
      tank due to atmospheric pressure as the tank is being drained for
      maintenance. Air must be allowed into the tank to replace the water that is
      being drained. You can also open an upstairs tap to allow air into the
      system as the tank is being drained for maintenance.
      JB

      Answered on 10/24/2012 by Anonymous
    • VERIFIED BUYER

      A:

      If you lose water pressure on your cold water side, the water in the heater could back-siphon. You could lose pressure if your supply pressure is ever compromised due to a main line break; or, if you shut off the supply-side water for whatever reason (repairs, adding irrigation, etc.), all that hot water in your heater could back-siphon into the supply side of your water line. The vauum relief valve should be installed at the highest elevation on the line that feeds the water heater. Hope this helps.

      Answered on 10/24/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Direct from the Watts website:
      "For automatic venting of a closed system to atmosphere when
      a vacuum is created. The Watts N36-M1 Vacuum Relief Valve
      permits air to enter and prevent vacuum conditions that could
      siphon the water from the system, resulting in collapse of a
      tank or water heater or equipment burn out."
      I needed it for a combination boiler - both domestic hot water and hydronic
      heating hot water. I protects the small on-board domestic hot water tank
      from collapse resulting from a catastrophic piping failure (big leak).

      Answered on 10/24/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Tank collapses. Is that bad enough? Ignore at your own peril!

      Answered on 10/25/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Required by what? By local building code somewhere, most likely. The only good use I know of is to aid drain down of the tank by admitting air into the line. But this can be done by opening a cold water valve upstream in the line somewhere. I use 2 of these valves on the lines to my solar hot water collector for drain down purposes. They admit air when the collector drain is opened to allow the water to escape so it won't freeze and rupture the tubing in it on cold winter nights. This is when the input and output valves to and from the collector are closed. A plumber should have more ideas, but I've never seen a need for a vacuum relief valve on standard hot water heater installations that I've put in myself or seen in standard construction.. And: email the heater mfg for clarification. It might even get a specific answer, but probably not. Todd F. Pioneertown, CA.

      Answered on 10/26/2012 by Anonymous
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