Tunstall Air Valve

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About

Quick, uniform distribution of heat to all radiation is essential to one pipe steam performance. This requires balancing the radiation by controlled venting.
(NOTE: Tunstall’s #1P and 31P air valves are currently discontinued.)
  • Tunstall steam air valves are made, assembled, tested, and inspected in the U.S.
  • Each unit is individually packaged with external labeling for inventory convenience and maintenance
  • Steam valves have brass internals, with nickel plated and hand polished exterior.

Steam Vent Specifications

TUNSTALL STEAM VENTS
USE FOR NO. CONNECTION VENT PORT MAX OPER. PRES. OVERALL HEIGHT
FREE STANDING RADIATORS 11P 1/8” MALE 1/16” 6 PSI 2 3/4″
CONVECTOR AND RISERS 33P 1/4″ MALE 1/16” 6 PSI 3 3/4″
MAIN VENTS 35P 3/4″ MALE x 1/2″FEMALE 3/32” 3 PSI 3 1/4″
75P 3/32” 5 PSI 4 5/8”
Notes:
  1. Maximum operating pressure or drop away pressure is the maximum pressure at which the vent will continue to open and close by gravity.
  2. One pipe steam systems function best when pressure is less than 2 psi.
  3. The lower the pressure at which a system is operated, the greater its efficiency will be.

Hot Water Vent Specifications

Tunstall Hot Water Vents
USE FOR NO. CONNECTION MAX OPER. PRES.
RADIATORS 9P 1/8″ MALE 150 PSI
RADIATORS 10P 1/8″ MALE 150 PSI
AS REQUIRED 700P 1/8″ MALE 50 PSI
AS REQUIRED 14, 14A 1/8″ MALE 150 PSI

Replacement Guide

Tunstall REPLACEMENT GUIDE
TUNSTALL # DOLE # Connection Size/Description Steam(S) or Hot Water(HW)
9P 9 1/8″ M Coin Valve HW
10P 10 1/8″ M Key Value HW
10-4P 10-4 KEY for #10 HW
11P 1933 1/8″ M Angle S
33P 1933 1/8″ M Straight S
35P 1933 3/4″ M x 1/2″ F Straight S
75P 2C 3/4″ x 1/2″ Vent for Mains S
700P 2000 1/8″ M Straight, Hydronic Float Vent HW
14 14 1/8″ M Key Air Valve Assembly, 20″ x 3/16″ Tubing HW
14A 14A 1/8″ M Coin Air Valve Assembly, 20″ x 3/16″ Tubing HW

BULLETIN: TAV-0814 – Tunstall Air Valves