Bell & Gossett 87, 67, 17Sr, 17Jr, 4V Installation Manual
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BELL & GOSSETT
INSTRUCTION MANUAL
Miscellaneous Accessories
A90602
REVISION B
No. 26 Vacuum |
Nos. 87, 67 and 7 |
Nos. 17 Sr. and 17 Jr. |
No. 4V |
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Coin-Operated |
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Breaker |
Automatic Air Vents |
Automatic Air Valves |
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Air Vent |
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Installation, Operation and Maintenance Instructions
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
SAFETY
INSTRUCTION
This safety alert symbol will be used in this manual to draw attention to safety related instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD.
DESCRIPTION
Air vents are designed to vent the accumulation of troublesome air whenever it can be trapped.
The No. 87, 67 and 7 models are automatic air vents of float type while the No. 17 Sr. and 17 Jr. automatic models are hygroscopic in operation.
The No. 4V air vent is a manual type vent specially designed for radiators.
The No. 26 vacuum breaker is designed to protect closed vessels and piping systems against collapse when induced vacuum exceeds design conditions. When used on steam systems the vacuum breaker permits the normal return of condensate to the boiler.
INSTALLATIONS INSTRUCTIONS
1.Install air vent in hydronic piping system or in hydronic system components where air is expected to accumulate and must be removed for proper hydronic system operation.
Vacuum breakers are installed in steam systems or other systems where vacuum from condensing steam or from other sources must be controlled.
2.#7, #67 and #87 air vents are float type and must be installed in the vertical position with vent connection pointing up.
3.The #87 air vent can be installed on 1/2" nipple or into a 3/4" NPT female connection.
4.The #17 Sr and #17 Jr air vents will function better if installed on a 1/2" or 3/4 5 5" to 6" long NPT nipple.
©COPYRIGHT 1992, 1996 BY ITT INDUSTRIES, INC.
CAUTION: Uncontrolled venting of water can 
occur with automatic air vents if foreign material prevents vent from closing. A No. 113023 overflow connector and 1/4" OD copper tube should be used to direct unwanted flow to a drain. Failure to follow these instructions could result in property damage and/or moderate
personal injury.
CAUTION: Pipe compound can foul the air vent or vacuum breaker operating mechanism. Use pipe joint compound sparingly on male pipe threads only.
Failure to follow these instructions could result in property damage and/or moderate personal injury.
CAUTION: Overtightening and breakage can occur with the use of teflon pipe joint compounds.
Teflon provides lubricity so that care must be exercised not to overtighten joints. Failure to follow these instructions could result in property damage and/or moderate personal injury.
CAUTION: Venting hot water or steam can cause 
injury. When working near any air vent or vacuum breaker be careful not to get inline with vent connection. Failure to follow these instructions could result in property
damage and/or moderate personal injury.
OPERATIONAL LIMITS
Model No. |
Pressure psig (Bar) |
Temperature ˚F (˚C) |
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87 |
150 |
(10.3) |
240 (116) |
67 |
35 |
(2.4) |
240 (116) |
7 |
75 |
(5.1) |
240 (116) |
17Sr |
30 |
(2.1) |
225 (107) |
17Jr |
30 |
(2.1) |
225 (107) |
4V |
150 |
(10.3) |
250 (121) |
26 |
2" Hg Vacuum to 150 (10.3) |
240 (116) |
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Bell & Gossett
ITT Fluid Technology Corporation
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