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▲ WARNING
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
causing property damage and personal
injury or death.
Type TAV vent must be installed,
operated and maintained in
accordance with federal, state and
local codes, rules and regulations and
Emerson instructions.
If leak develops in the system, service
to the unit may be required. Failure
to correct trouble could result in a
hazardous condition.
Installation, operation and maintenance
procedures performed by unqualied
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a
qualied person shall install or service
the Type TAV Thermostatic Air Vent.
Introduction
Scope of the Manual
This manual provides instructions for the operation
and installation for Type TAV thermostatic air vent.
Product Description
Type TAV is high capacity thermostatic air vent. Its
balanced pressure design stainless steel welded
actuator is capable of discharging air within 35°F /
2°C of saturated temperature. Thermostatic actuator
Spence Type TAV Thermostatic Air Vent
Figure 1. Type TAV Thermostatic Air Vent
employs a conical valve lapped in matched sets with
the seat ring assuring tight shut o. Vent are stainless
steel bodied suitable for pressures to 650 psig / 45 bar
and available in NPS 3/8 to 1 / DN 10 to 25 with NPT
or socket weld connections.
Instruction Manual
VCIMD-16333 Type TAV
November 2021
Specifications
The specifications section on this page provide the ratings and other specifications for the Type TAV thermostatic
air vent.
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Sizes
NPS 3/8, 1/2, 3/4 and 1/ DN 10, 15, 20 and 25
Connection
NPT and Socket weld
Maximum Operating Temperature(1)
650°F / 343°C
Maximum Operating Pressure(1)
650 psig / 44.8 barg
Maximum Allowable Temperature(1)
750°F / 400°C
Maximum Allowable Pressure(1)
650 psig / 44.8 barg
Materials of Construction
Body and Cover: Carbon steel, Stainless steel
Actuator: Welded Stainless steel
Valve and Seat: Hardened 416 Stainless steel
Principle of Operation
Thermal actuator is filled at its free length with a
liquid having a boiling point lower than water. As
assembled, valve is normally open. On startup, air
passes through vent. As air is eliminated, hot steam
reaches vent and the thermal actuator fill vaporizes
to a pressure higher than line pressure. This forces
the valve into seat orifice to prevent any further flow.
When the air collected increases, it takes heat from
the actuator, lowering internal pressure. Line pressure
will then compress thermal actuator to open valve
and discharge air. Valve lift automatically adjusts
to variations.
Installation
▲ WARNING
Personal injury, property damage,
equipment damage or leakage due to
escaping steam or bursting of pressure
containing parts may result if this
vent is over pressured or is installed
where service conditions could exceed
the limits given in the specifications
or where conditions exceed any
ratings of the adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to prevent
service conditions from exceeding
those limits.
Type TAV thermostatic air vent is installed on the
downstream side of steam trap.
Maintenance
The Type TAV thermostatic air vent is a sealed
unit making it maintenance free. It is composed of
corrosion resistant stainless steel components and
impingement plate with welded construction prevent
damage to actuator. No bolts, gaskets or adjustments
are necessary. Replacement traps cost less than
repair of more expensive in-line repairable vents.
2
Type TAV
Ordering Information
When ordering, complete the ordering guide on this
page. Refer to the Specifications section on page 2.
Review the description to the right of each
specification and the information in each referenced
table or figure. Specify your choice whenever a
selection is offered.
Parts List
Description Part Number
Gasket WAL0005599
Bellows WAL0015514
Nut WAL0049342
Plate, Actuator WAL422703
Inlet,
3/8 in. WAL422737
1/2 in. WAL422730
3/4 in. WAL422740
Orifice seat WAL423237
Body,
3/8 NPT WAL423751
1/2 NPT WAL423752
3/4 NPT WAL423753
3/4 SW WAL423757
3
Type TAV
Type TAV
Emerson Automation Solutions
SpenceValve.com
Americas
McKinney, Texas 75070 USA
T +1 800 558 5853
+1 972 548 3574
Europe
Bologna 40013, Italy
T +39 051 419 0611
Asia Pacic
Singapore 128461, Singapore
T +65 6777 8211
Middle East and Africa
Dubai, United Arab Emirates
T +971 4 811 8100
VCIMD-16333 © 2021 Emerson Electric Co. All rights reserved. 11/21
Spence is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a
trademark and service mark of Emerson Electric Co. All other marks are
property of their prospective owners.
The contents of this publication are presented for informational purposes only,
and while every eort has been made to ensure their accuracy, they are not to
be construed as warranties or guarantees, express or implied, regarding the
products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We
reserve the right to modify or improve the designs or specications of such
products at any time without notice.
Emerson Electric Co. does not assume responsibility for the selection, use
or maintenance of any product. Responsibility for proper selection, use
and maintenance of any Emerson Electric Co. product remains solely with
the purchaser.
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