75, 1/2" x 3/4" Straight Steam Main Air Valve Zoom

75, 1/2" x 3/4" Straight Steam Main Air Valve

SKU:401434

Brand: Hoffman

Hoffman
Qty Price
$69.95
/ each
$332.75 / box (5 units x $66.55)
In Stock! Ships in 24-48 Hours
(1042 Available)
2

Specs

Application: Main Vent
Size: 1/2" x 3/4"
Type: Non-Vacuum
Float-type Vent
System Type: Steam
Max Pressure: 15 psig
Max Operating Pressure: 3 psig
Mount: Straight
Adjustability: Non-Adjustable
Material: Steel
Thread Type: Female
Male
Temperature Range (F): 140°-240°F
Max Temp (F): 240°F
Min Temp (F): 140°F
Thread Size: 3/4"
1/2"

Description for Hoffman 401434

Air Valve (non-vacuum)

  • Float-type thermostatic vent
  • For medium and large systems
  • Single non-adjustable port
  • 1⁄2" NPT female and 3⁄4" NPT male straight shank
  • Maximum operating pressure: 3 psig (0.2 bar)(Drop away pressure - maximum pressure against which the vent can open).
  • Maximum pressure 15 psig (1.0 bar)

75, 1/2" x 3/4" Straight Steam Main Air Valve

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by PowerReviews
Hoffman75, 1/2" x 3/4" Straight Steam Main Air Valve
 
5.0

(based on 5 reviews)

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100%

of respondents would recommend this to a friend.

Reviewed by 5 customers

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5.0

75, 1/2" x 3/4" Straight Steam Main Air

By chuck

from Livingston, NJ

Verified Buyer

Comments about 75, 1/2" x 3/4" Straight Steam Main Air Valve:

Used on mail line - works great - ordered another one for secomd line.

 
5.0

Can't beat a classic

By John in Building Maintenance

from Los Angeles, CA

Verified Buyer

Pros

    Cons

      Best Uses

        Comments about 75, 1/2" x 3/4" Straight Steam Main Air Valve:

        Used to vent the main steam and return lines in our apartment buildings. Vent capacity and reliability second to none in this class.

        • Primary use:
        • Business
         
        5.0

        Works like it should

        By Jake

        from Ann Arbor, MI

        Verified Buyer

        Pros

          Cons

            Best Uses

              Comments about 75, 1/2" x 3/4" Straight Steam Main Air Valve:

              Had to replace a #76 valve that was used on a system that was originally coal. Used the #75 as the boiler is now natural-gas powered. It installed without a problem. So far there are no issues with the valve, and I am very happy with the results.

              • Primary use:
              • Personal
               
              5.0

              I would definetely recommend

              By OHS

              from Philadelphia,Pa

              Verified Buyer

              Pros

                Cons

                  Best Uses

                    Comments about 75, 1/2" x 3/4" Straight Steam Main Air Valve:

                    The product worked as advertised and the price WILL BEAT ANY COMPETITOR.[...]

                    • Primary use:
                    • Business
                     
                    5.0

                    This is what I'm talking about

                    By Bobthechef

                    from Boston, MA

                    Verified Buyer

                    Pros

                      Cons

                        Best Uses

                          Comments about 75, 1/2" x 3/4" Straight Steam Main Air Valve:

                          At first I thought, "Do I really need a [$] vent?"Worth every penny. These and some pipe insulation did the trick. Regular vents just don't let the air out of the system fast enough. Now I'm heating my house and not my basement. Looking forward to a toasty winter in our 4,000 sq ft 175 year old home, at last.

                          • 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 | 4 Answers
                          Displaying questions 1-2
                          • 75, 1/2" x 3/4" Straight Steam Main Air Valve

                            Q:

                            How tall is this unit
                            Asked on 1/4/2014 by Joseph from NY, NY

                            1 answer

                            • VERIFIED BUYER

                              A:

                              Good AM
                              The Hoffman model 75, p/n 401434, is 5-5/8" tall overall.
                              Michael Milawski
                              Associate Director of Physical Plant
                              SUNY Downstate Medical Center

                              Answered on 1/6/2014 by Anonymous
                          • 75, 1/2" x 3/4" Straight Steam Main Air Valve

                            Q:

                            What is it's puprose? How often must it be changed
                            Asked on 9/11/2010 by Anonymous

                            3 answers

                            • CUSTOMER CARE

                              A:

                              Air Valves perform two important functions in a piping system. They maintain system design efficiency and provide system protection. Air valves do not need to be changed as long as they are functioning properly.

                              Answered on 9/13/2010 by PexSupply Staff from NY
                            • VERIFIED BUYER

                              A:

                              This valve vents cool air from the radiator system to help the steam circulate. When the air heats up, the valve closes so no steam leaks out.

                              These valves last for years, but eventually stop working. I have heard that they last 10 to 15 years, but do not know. When they stop working, they will remain open all the time, and will leak steam into the house throughout the whole steam cycle.

                              Answered on 3/22/2011 by Jake from Ann Arbor, MI
                            • VERIFIED BUYER

                              A:

                              This vent removes steam and hot air pockets from the condensate return lines in a closed loop steam heat system. That is, steam goes out to your radiators to heat your building. As the steam gives up its heat to warm your room, the steam condenses into hot water, which returns to the boiler to be re-heated. For various reasons, steam may sometimes also return with the hot water, as well as air bubbles. These pockets can block the flow with pressure, cause your boiler to be full of air, or damage your pipes. This vent lets the steam and hot air out, but keeps the hot water in.

                              If properly placed and sized, this vent should last for decades.

                              Answered on 1/29/2012 by John in Building Maintenance from Los Angeles, CA
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