tekmar 720 4-Way Mixing Valve User Manual

Data brochure, D 720, Way mixing valve 720

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2011 D

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09/11

D 720

09/11

- Data Brochure

4-Way Mixing Valve 720

The 4-Way Brass Mixing Valve 720 is used to mix supply water from a heat source with water
returning from a system. It is designed for use in either closed loop or open loop hydronic systems.
It connects to pipe using standard female NPT threads. The valve provides a maximum leak
through rate of 1% to allow for water expansion during temperature changes. The valve position
can be manually set using the handle. An Actuating Motor 741 can be used to automatically
operate the valve.

Sequence of Operation

When the flap is in the fully closed position,
100% of the boiler supply water is returned
to the boiler and 100% of the heating system
return water is supplied to the system. When
the valve flap is in the fully open position,
100% of the boiler supply water enters the
heating system and 100% of the heating
system return water returns to the boiler.
Mixing of the water takes place when the valve
flap is in an intermediate position.

Installation

Check the contents of the package. If any of the items listed below are missing or damaged, please refer to the Limited Warranty
and Product Return Procedure on the back of this brochure and contact your wholesaler or local tekmar representative.

One Mixing Valve & One Data Brochure D 720

IMPORTANT: When mounting the valve, leave a minimum of 4” (10 cm) clearance between the bottom cover and surroundings.
This will ensure that all valve components can be easily serviced.

Replacement Parts

The Mixing Valve Handle Kit M3047 contains a replacement
manual valve handle, a brass screw, a “C” clip, and a position
indicator plate.

The Replacement O-Ring kit contains a small, a medium and
a large o-ring. Use M3056 kit for valves 3/4” to 1-1/4”.

brass

screw

handle

“C” clip

indicator plate

Valve 50% position

Valve fully open

Valve in closed position

As delivered, no
changes required.

Remove the “C” clip from the
shaft. Turn over the indicator
plate in order to reverse the
scale. Re-install the indicator
plate, “C” clip and handle.
(components shown below)

Valve
Closed

Valve
Closed

Clockwise to Open

Counter Clockwise to Open

to system

to boiler

from

boiler

5 7 9

10

3

1

0

from

system

5 3 1

0

7

9

10

to system

to boiler

from

boiler

from

system

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