INSTRUCTIONS
MSVT-0714-I-1
OPERATION
A
ll Series “EASYMT” and “EASMT” PTFE Bellows solenoid
valves are direct acting, 2-way, and normally closed valves.
When their solenoid coils are de-energized the valves are closed,
and open when the coils are energized. Valves with 24 watt coils
can be energized continuously.
FAIL-DRY
®
DESIGN
All series “EASYMT” and “EASMT” valves utilize the PLAST-O-
MATIC patented FAIL-DRY
®
safety design which features a
vented chamber separating two (2) sealed sections of the valve
body. This concept is extremely important for solenoid valves
used in the chemical processing industry as it protects the metal
operating components from corrosion that could cause valve
failure and offers a warning of valve leakage before a failure
occurs.
INSTALLATION
Please check the nameplate for correct part number, pressure
ratings, and voltage. Also check the flow label located on the
side of the valve body to insure proper flow direction. If flow label
is missing, the inlet can be distinguished from the outlet port. The
outlet is always deeper than the inlet.
PLAST-O-MATIC solenoid valves operated by 24 watt coils can
be mounted horizontally or vertically; however, vertical mounting
(coil up) is preferred since it results in longer cycle life.
Valves should
NEVER
be mounted with the coils on the bottom.
When installing these valves in a piping system they should only
be connected to plastic pipe or plastic fittings. All male threads
should be wrapped with PTFE tape or other acceptable pipe
sealant. To prevent stringing of the PTFE tape into the inner
workings of the valves, be sure to keep the tape at least one full
thread from the end of the pipe.
Whenever PTFE tape or other pipe sealants are used there is a
tendency to over-torque because of the reduced friction.
Therefore, connections should only be made hand-tight followed
by one quarter turn more. Greater forces tend to stretch or distort
the plastic bodies which could lead to future ruptures. Strap
wrenches may be used for assembly. Metal pipe wrenches
should
NEVER
be used as they can deeply scratch the plastic
surfaces causing additional stresses.
Wiring should comply with all applicable electrical codes, local or
otherwise. Care should be taken to insure that the solenoid coil
leads cannot be pulled from the coil. If flexible conduit is not
used to connect to the solenoid housing the supply conduit must
be properly aligned and supported to prevent stressing the
solenoid assembly. See Wiring Diagram.
VALVE PRESSURE RATINGS
These PLAST-O-MATIC solenoid valves are direct acting and do
not require minimum operating pressure differentials, but the
maximum inlet and back pressure ratings must not be exceeded.
If the maximum inlet pressures are exceeded the valves will not
open and the coil can burn out.
Back pressure can result in two (2) ways. First, from a separate
pressure source in the downstream piping. And second, from the
flow of liquid through the downstream piping. If the back
pressure rating is exceeded in the first situation the valve will
open and a reverse flow will take place if there is a lesser inlet
pressure. In the second situation the valve will not close and flow
will continue. When back pressures are caused by the liquid flow
it naturally follows that any restriction in the downstream piping
will cause even higher back pressures. This is especially true with
spray nozzles.
The following chart is to provide overall guidelines on various
thermoplastics relative to their pressure and temperature
relationships. The information should be used to determine
limitations of the various materials rather than selection of a
specific valve since each individual valve model has its own
pressure ratings. Refer to specifications table in the product
catalog.
MAINTENANCE
The major causes of solenoid valve failure are usually either
chemical incompatibility, damage from water hammer or foreign
matter in the valve. Water hammer may be minimized by
adhering to a safe piping velocity of 5 feet per second.
Commonly encountered foreign matter includes pipe sealants,
mineral and salt deposits, and other solids.
Before disassembling a valve for examination or cleaning make
sure all electrical power and fluid line pressure are turned off. It
should be noted that even after a pump is shut down to eliminate
fluid line pressure there may still be pressure trapped in the piping
system. One example of this would be head pressure located in a
vertical run of pipe. If this situation is possible, extreme caution
should be exercised when removing the top housing from the
valve body. It would be advisable to place a clear plastic shield
over the valve during disassembly to avoid injuring a worker.
CAUTION:
Avoid breathing dangerous vapors and avoid skin
contact with chemicals.
Whenever disassembling a valve it is wise to carefully inspect all
of the parts to insure proper operation when it is reassembled. It
is also a good idea to have a spare seal kit on hand.
When removing foreign matter or deposits on the valve seat or
other internal parts, care should be taken not to scratch or nick
the parts being cleaned.
After reassembly, operation should be checked by energizing the
solenoid coil. If the valve is operating properly, a sharp metallic
click will usually be heard when the valve’s coil is energized.
FAIL-DRY
®
is a registered trademark of Plast-O-Matic Valves, Inc.
MATERIALS TEMPERATURE vs. PRESSURE
MAXIMUM INLET PRESSURES AND TEMPERATURES
MAX.
MAT’L
TEMP
PVC
140°F
140 9,6 100 6,8 40 2,7
N.R
N.R
N.R.
N.R
(60°C)
CPVC
180°F
140 9,6 100 6,8 80 5,4
40 2,7
N.R
N.R.
N.R
(82°C)
GPP**
220°F
140 9,6 120 8,2 100 6,8
80 54
40 2,7
N.R.
N.R
(105°C)
PVDF
284°F
140 9,6 130 8,8 120 8,2 100 6,8
60 4,1
30 2,0
10 0,7
(140°C)
N.R. = Not Recommended
GPP** = Glass-Filled Polypropylene
75°F
(24°C)
PSI Bars
110°F
(43°C)
PSI Bars
140°F
(60°C)
PSI Bars
180°F
(82°C)
PSI Bars
220°F
(105°C)
PSI Bars
240°F
(116°C)
PSI Bars
284°F
(140°C)
PSI Bars
Series EASYMT & EASMT Solenoid Valves
IMPORTANT NOTES BEFORE INSTALLING
