Watts EMVII-6400-SS User Manual
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IOM-EMV II 2
1
/2"-3"
Installation, Operation and Maintenance
Instructions
The Watts EMVII-6400SS motor valve is an electrically actuated
standard port bronze ball valve with 316 stainless steel ball and
stem. The 2
1
/2" and 3" (65 and 80mm) valves have a reversing
actuator with a 75% duty cycle NEMA 4, 7 and 9 enclosure.
The installation section of this manual is broken into two parts
1-valve and 2-electrical. Prior to installation it is important to
familiarize yourself with both sections so that the unit is properly
installed.
Valve Installation
A. The stem seals on your EMVII-6400SS valve may require
periodic adjustment during its normal service life, therefore,
installations that prevent access to the valve for maintenance
must be avoided. Further, it is important to understand that
no valve’s stem seals will function indefi nitely. Eventually stem
seals will require adjustments. At this point the external leak-
age would start off as a slight seepage and if left unattended,
could become signifi cant.
B. All Watts EMVII-6400SS’s utilize bidirectional valves and
as such, can be installed to shut off fl ow in either direction.
C. When piping up the valve, be sure that the threads on the
mating pipe are free of excessive grit, dirt or burrs. Take care
to assure that any pipe sealants used are not so excessively
applied to the pipe threads that the valve cavity becomes
fouled.
D. The unit can be installed with the actuator portion in either
the vertical or horizontal plane, however for steam or high
temperature applications see Section E.
E. For installations for steam or other high temperature services
your Watts EMVII-6400SS features an electric actuator with
a maximum ambient temperature rating of 150°F (66ºC).
Higher temperatures will result in a signifi cant reduction of
the duty cycle rating and/or damage to electrical compo-
nents.
Some steam or other high temperature applications may
require that the actuator be installed horizontal to the pipe
(on horizontal piping) to protect the unit from radiant heat.
All piping in which units are installed and any adjacent piping
must be insulated to further reduce the effects of piping
radiant heat.
Electrical Installation
Note: Prior to making wiring connections, be sure that all
external wiring and electrical components have been properly
selected to suit the power consumption levels of your particular
unit.
Note: Not all voltage/cycle time combinations are available for
every valve size. For specifi c model combinations consult your
Watts distributor or representative.
1. Wire per the diagram included inside the cover of the unit.
Note that the diagram refl ects the actuator depicted in the
open position. In order to maintain enclosure integrity, proper
conduit connections for your application (general purpose,
weatherproof, explosion-proof or proof) must be used. (Per
various electrical codes there is a green screw on the actua-
tor base plate for grounding purposes).
2. Replace the cover and tighten all eight hex head bolts. Apply
power to the unit alternately in both directions to assure that
the valve is traveling from its fully open to its fully closed posi-
tion (on/off applications). If the unit does not travel a full 90°
or if resultant rotation of the valve results in lack of full open
or full closed position, it may be necessary to adjust travel by
adjusting limit switch cams.
Maintenance
During its’ normal service life the only maintenance that may
be required by your EMVII-6400SS should be periodic stem
seal adjustment. It is important that stem seal leaks to not go
unattended as failure to adjust stem packing could signifi cantly
reduce seal life. To adjust stem seals, simply tighten the stem
gland nut.
Do Not Over-Tighten, as in doing so you may over-compress
stem seals which could result in excessive stem seal loading
and reduction of seal life.
Switch Setting (Travel Limits)
When shipped from the factory the actuator will typically be in
the “valve open” position (counterclockwise extreme of travel).
This means that the valve open circuit travel has been complet-
ed and the circuit is open.
1. Disconnect Power supply.
2. Loosen set screw in declutching knob, and remove knob.
3. Remove the hex head cover bolts located around the fl ange
of the unit.
4. To set open travel limit switch:
a. Using the declutchable manual override, place valve in its
fully closed position.
b. Loosen the top cam’s set screws and rotate cam until a
“click” is heard from the top unit switch. This “click” indi-
cates that the switch circuit has opened and thus defi nes
the unit’s open travel stop point.
c. Tighten cam set screws taking care not to over tighten.
5. To set close travel limit switch:
a. Using the declutchable manual override, place the valve in
its fully closed position.
b. Loosen the bottom cam’s set screws and rotate cam until
a “click” is heard from the bottom limit switch. This “click”
indicates that the switch circuit has opened and thus
defi nes the units closed travel stop point.
c. Tighten cam set screws taking care not to over tighten.
6. Replace cover and test the unit. It may be necessary to
repeat step(s) 4 and/or 5.
7. Replace and tighten all cover fl ange bolts.
8. Replace and properly secure declutching knob.
9. Unit is now ready for operation.
Table 1 - Power Consumption
Series EMVII-6400SS
Electric Motor Valves
Sizes: 2
1
/2"– 3" (65 – 80mm)
VALVE SIZE VOLTAGE AND MAX AMPERAGE
in. mm CYCLE TIME DRAW
2
1
⁄2"- 3" (65 – 80mm) 115 VAC-25 Second 1.0
2
1
⁄2"- 3" (65 – 80mm) 24 VAC-25 Second 3.0
1
2
Summary of Contents
Page 1 - Electric Motor Valves
IOM-EMV II 21/2"-3"Installation, Operation and MaintenanceInstructionsThe Watts EMVII-6400SS motor valve is an electrically actuated standar
Page 2 - Terminal No. Function
Operational Characteristics and Ratings1. Valve type - Quarter-turn ball valve, bronze body, 316SS ball and stem, reinforced Tefl on® seats, standard
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