Product Overview

Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-MC-NTV-0714
Valves
NT SERIES VALVES
Operation
The Macon valve is designed to save energy by
controlling hot water or low pressure steam heat in
freestanding radiators, convectors, baseboards, fan
coil units and the like in a loop, a zone or a unit.
The valve, coupled with a Macon operator, pro-
vides a reliable automatic modulating unit. As room
temperature drops, the Macon valve opens to allow
more hot water or steam to flow through the radia-
tor, thus allowing more heat into the room. When
the room approaches the selected temperature, the
operator causes the valve to begin closing off the
flow of hot water or steam. This continued monitor-
ing of the temperature is fully automatic, using no
electricity whatsoever. The Macon valve can be
equipped with any wide variety of Macon opera-
tors.
Features
 Compact dimensions
 Replaceable insert
 Stainless steel spindle
 Individual room control
 Easy one-trade installation
 Fuel savings up to 30%
 Prevents over- and under-heating
 Helps balance the heating system
 Same valve used for hot water or low pressure
steam
 All NPT are forged brass nickel-plated
 Minimizes or eliminates expansion noises
 Suitable for nearly any hydronic heating appli-
cation
 Operators can be changed without draining the
system
 Shipped with a protective cap that can be used
to control heating during the installing period
Vertical angle valve with straight nipple. NPT - female inlet,
male union outlet.
N10637 - 1/2”
N10657 - 3/4”
N10677 - 1”
N10697 - 1-1/4”
Straight valve with straight nipple. NPT - female inlet, male
union outlet.
N10737 - 1/2”
N10757 - 3/4”
N10777 - 1”
N10797 - 1-1/4”
Horizontal angle valve with straight nipple. NPT - female
inlet, male union outlet.
N10837 - 1/2”
N10857 - 3/4”
N10877 - 1”
N10897 - 1-1/4”
Sweat valve with female inlet and outlet.
N10930 - 1/2”
N10950 - 3/4”
N10970 - 1”
Fail closed valves also available, consult factory.
All Macon valves and thermostats conform to ASHRAE Standard 102P-1983
and European Standard EN 215/1215. We are also ISO 9001 certified (1994)
and ISO 14001 certified (1998).
A
B
C
D
FLOW
FLOW
FLOW
FLOW
= VALVE
VALVE LOCATION IN SINGLE AND
MULTIZONE HEATING SYSTEMS.