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Vent-Rite No. 11 Steam Vent - Vent-Rite Valve Corp. & InspectApedia.com Steam Vent Summary Table
Cross References & Sources

Steam vent types:

Two-pipe steam heat vents vs one-pipe steam heat vents: this article gives a table of the Summary Of Types Of Steam Vents On 1 & 2 Pipe Steam Systems.

We also provide a Steam Vent Product Cross Reference table for further information on steam vent replacement.

Our page top photo is a Vent-Rite # 11 steam vent intended for 1 pipe steam systems.

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Steam Vent Summary Table, Cross References, & Sources

Hoffman No. 41 steam vent cited & discussed at InspectApedia.com At left is the Hoffman No. 41 is a steam vent . The mounting method of a vent varies and is a reason for making sure you have the right replacement steam vent.

The information in this article will assist you in selecting the proper replacement steam vent for your 1 or 2 pipe steam heat system.

Watch out: If the radiator continually makes noises (whistling or wheezing) at the steam vent, there is a problem that needs to be fixed: a bad steam vent, steam piping problem, steam pressure set too high, or boiler oversized for the heating distribution system.

Watch out: Be sure your steam heating system and its controls are properly adjusted - excessive steam pressure can be dangerous.

[Click to enlarge any image]

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Summary of Types of Steam Vents on 1 & 2 Pipe Steam Systems

The following tables are adapted from product literature provided by Emersonswan.com, a provider of Vent-Rite steam vents for radiators, convectors, steam risers, main steam vents and vents for unit heaters.

Table of Non-Vacuum Vents & Their Applications & Substitution Part Numbers
Vent-Rite, Dole, & Hoffman Steam Vents 1

Application
Product Number
Connection 
Vent Port Diam
Operating
Pressure
 2
O.A. HT. 
Adjustable? 
Substitutes For
Vent-Rite vents for
Free-Standing Steam Radiators
No. 1
1/8" Male NPT
3/32"
3 psi
3 1/4"
Yes
Dole #1A
Hoffman# 1A
No. 11
1/16"
6 psi
2 3/4"
 
Dole #1933
Hoffman#40
Vent-Rite
Convector Heaters
Steam Risers
No. 31 1/8" Male 1/16"1/16" 6 psi 3 3/4"   Dole #3A
Hoffman# 41
No. 33 1/4" Male   Dole #3B
Hoffman #43

Vent-Rite
Main Steam Vents

No. 35 3/4" Male x 1/2" Female NPT 3/32" 3 psi 3 1/4"   Dole #4
Hoffman #45
No. 75 5 psi 4 5/8"   Dole #3C
Hoffman #45
No. 77 1/8" 3 1/2 psi   Dole #5
Hoffman #45
Vent-Rite Unit Heater Steam Vents No. 57 3/4" Male x 1/2" Female NPT 1/32" 20 psi 4 5/8"   Dole #55
Hoffman #77
Hoffman Steam Air Line Valve No. 3            
Hoffman Steam Vent - radiators No. 40 Angle - Side Inlet 1/8" 6 psi      
Hoffman Steam Vent - convectors No. 41 Bottom Inlet 1/8" 6 psi      

THERMOSTATICALLY-CONTROLLED

No-Float type vents

             

2-Pipe Steam Radiator Valves & Traps

See
STEAM TRAPS

and
RADIATOR VALVES & HEAT CONTROLS

and
STEAM VENTS THERMOSTATICALLY CONTROLLED

             

Notes to the table above

1. Adapted from "Air Valve for Steam Systems", Emerson Swan (Vent-Rite), Vent-Rite Valve Corporation: 1875 Dewey Ave. Benton Harbor, MI 49022 TEL: (269) 925-8818 FAX: (269) 925-7888 retrieved 2/28/2014, original source www.emersonswan.com/ckfinder/userfiles/ files/Vent-Rite%20Literature%281%29.pdf

2. Operating pressure drop ("drop away") is the maximum pressure at which the vent will continue to open and close due to the change of temperature.

The vent may be used with slightly higher pressure provided it drops below the operating pressure between each firing cycle.


Steam Vent Product Cross Reference

Steam Vent Cross Reference / Substitution Chart

Eaton / Dole Hoffman Vent-Rite
1A 1A 1
4 45 35
3A 41 31
3B 43 33
3C 45 75
5 45 77
55 74 57
1933 40 11

Notes to the table above:

Watch out: be sure to review the manufacturer's specific details before attempting to swap steam vents. Other manufacturers will have additional steam vent cross-reference charts; do not attempt to remove a steam vent if you are not properly trained as you could be badly burned or injured.

Some of these steam vents work on either 1-pipe or 2-pipe steam systems while some others such as the Dole (now Eaton Steam Vents) 80 / 85-series steam vents are for single-pipe steam systems.

Steam Vent Manufacturers, Installation Instructions, Repair Guides

Dole 1933A Steam Radiator Vent at InspectApedia.comIllustration: Dole 1933A 1/8" NPT Angle Steam Vent

  • Armstrong, Rv-4 One-Pipe Steam Radiator Valve [PDF] available from Armstrong International, 816 Maple Street, Three Rivers, MI 49093 USA, Tel: (269) 273-1415, Armstrong has offices in Beijing, China, Belgium, India and Mexico. Web search 12/27/2010, original source:
    http://www.armstronginternational.com/thermostatic-valves-rv-4-one-pipe.
  • Barnes & Jones Corporation, 91 Pacella Park Drive Randolph, MA 02368, Tel: 781-963-8000calibrated steam traps and vents, Website: http://www.barnesandjones.com/Email: bnesbitt@barnesandjones.com. Vent-Rite steam vents for radiator control.
  • Eaton - Dole® AIR VALVES for STEAM & HYDRONIC HEATING SYSTEMS, Siebe Appliance Controls, Laundry and Specialty Systems Division, 191 East North Ave., Carol Stream IL 60188 USA Tel: 800-332-4643
  • Eaton - Dole® AIR VALVES for STEAM & HYRONIC HEATING SYSTEMS, W.R. Wallin Associates, Website: wallinassociates.com retrievfed 2020/02/28 original source : http://www.wrwallin.com/yahoo_site_admin/assets/docs/Tunstall.7975833.pdf

    Note: Dole air and steam valves are now handled by Eaton - good luck finding the company's contact information, but you can find the products at your local plumbing or heating supplier.
  • Energy Savers: Heat Distribution Systems, Steam Radiators & Hot Water Radiators, [PDF] U.S. Department of Energy, web search 12/27/2010, original source: http://www.energysavers.gov/your_home
    /space_heating_cooling/index.cfm/mytopic=12580
  • Gorton Heating Corporation, 546 South Avenue East, Cranford, New Jersey 07016, Tel: 908-276-1323, email: info@gorton-valves.com, Website: http://www.gorton-valves.com/ fast venting valves for steam heating systems.
  • ITT Hoffman Specialty STEAM VENTS for RADIATORS MODEL 1A 1B AIR VALVE INSTALLATION INSTRUCTIONS [PDF] (2007), ITT 8200 N. Austin Ave. Morton Grove, IL 60053 tel: 847-966-3700 fax: 847-966-9052 www.hoffmanspecialty.com
  • Hoffman 1A ADJUSTABLE STEAM VENTS [PDF] Hoffman Specialty, ITT, web search 12/27/2010, original source:
    http://www.drillspot.com/products/51570/Hoffman_1A_Adjustable_Automatic_Air_Vent_For_Steam_Radiators

    Hoffman can be contacted at bellgossett.com/hoffman-specialty-products/
  • Hoffman CONVECTOR STEAM VENTS [PDF] Hoffman Specialty, ITT, web search 12/28/2010, original source:
    http://www.hoffmanspecialty.com/pdf/hs900/HS900-conv109.pdf
  • Hoffman, Special Steam Vents, Hoffman Specialty heating products, web search 12/27/2010, original source:
    http://www.hoffmanspecialty.com/pdf/hs900/HS900-3474.pdf
  • Hoffman Steam and Water Vents, Selection Guidelines - found

    in HOFFMAN SPECIALTY CATALOG HS-900G [PDF] - Steam Vents Hoffman Specialty, web search 12/27/2010, original source:
    Hoffman can be contacted at bellgossett.com/hoffman-specialty-products/
  • Hoffman SPECIALTY SERVICE PARTS CATALOG [PDF] Op. Cit. repair parts and service
  • Holohan, D, "Care & Feeding of Air Vents", Dan Holohan, Old House Journal Online, November 2004
  • Sid Harvey AIR VENT STEAM VENT CATALOG [PDF] Sid Harvey Industries, Inc 605 Locust Street Garden City, New York 11530 USA, Tel: (516) 745-9200 Email: sales@sidharvey.com

    Brief description of Amtrol Air Purger, Hoffman NO. 40 radiator steam vents and Eaton (Dole) 1-pipe steam system vents. This page includes detailed recommendations among Eaton steam radiator vents for models depending on distance of the radiator from the boiler or from the thermostat. Retrieved 2020/02/28 original source: http://orders.sidharvey.com/IMAGES/catalog/Unpriced/20104-34.pdf
  • Spirax Sarco Corporation USA, 1150 Northpoint Blvd. Blythewood, SC 29016 USA Contact Details Tel: (800) 575-0394 Fax: (803) 714-2222 Email: InsideSalesLeads@Spirax.com

    Website http://www.SpiraxSarco.com/us/
  • Vent-Rite Valve Corporation: 1875 Dewey Ave. Benton Harbor, MI 49022 TEL: (269) 925-8818

    Emerson Swan, Inc. 300 Pond Street Randolph, MA 02368 Tel: (781) 986-2000 Fax: (781) 986-2028 info@emersonswan.com

    Vent-Rite #1 with the Vent-Rite #35 Steam Heat Main air valve. The Vent-Rite #1 (or #11) is designed for 1-pipe steam systems and mounts on the radiator.

    The Vent-Rite #35,75, or 77 are intended for main vents (two pipe systems and located on the mains); The Vent-Rite #31 & 33 are used on steam risers and on steam convectors. Contact the company for help or to download their product guide.

 

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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2014-10-02 by Adriann - where to buy equivalent/replacement for Dole steam vent valves, sizes 3, 2B and 1A

We are new owners of a 1930's home with 1-pipe steam radiators (been doing my research....) I have Dole valves, sizes 3, 2B and 1A and cannot figure out the equivalent sizes for any other brand.

I have to replace 13 of these 'steam whistles' and would appreciate help in figuring out what size I need, have not had any luck with big box stores as they look at the steam valves with bemusement when I show it to them,
Thanks for any help

On 2014-10-06 by (mod) -

Adriann

You'll be much happier if you give up on the big box stores and stop by a local plumbing and heating supplier, asking for help from their steam expert. At least the larger suppliers usually have someone at hand who knows steam controls and can help you specify the replacement steam vents you need.

Dole made air vents and steam vents: the Dole steam vent was sold in several models, such as the Dole Vari-Vent Air Valve No. 1A, but your sizes 2B and 3 are higher capacity.

Also check our table in the article above where we give Replacement Steam Vent Substitution Sizes for Dole Steam Vents

To remove and replace a steam vent the heat must be off and the radiator cooled to avoid risk of burns. I would NOT remove a vent before locating a local steam vent supplier as I wouldn't want to risk having to leave the house with no heat for a time.

But you don't need to replace with the same brand, just the same type and same threaded tapping size.

On 2014-10-14 by Adriann

Thank you very much for your response, Dan. I will try a plumbing/heater store.


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Continue reading at STEAM VENT TYPES, SELECTION where we describe just about every type of automatic steam vent used on residential and most commercial systems. or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

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STEAM VENT TABLE & CROSS REFERENCES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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