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DIN EN ISO 9001:2000
Cert. No. 85 100 001 07808
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Diaphragm Valves For Dust Bag Shaker
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Diaphragm Valves operated
by a pilot solenoid valve are 2- way normally . These valves are designed for
extremely fast opening / closing and high flow rates.
The body and cover are of die cast aluminum alloy with
special anticorrosive coating. The solenoid valve is integrally
mounted on the diaphragm valve and has encapsulated coil
( Class F insulation ) with a water proof ( IP - 65 )
plug - on connector. |
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Operation:
The diaphragm divides the valve into an upper chamber
and a lower chamber. The air inlet leads into lower chamber
from where it passes into the outlet when the diaphragm,
lifts. The diaphragm has bleed hole through which the
high pressure inlet air bleeds into and fills up the upper
chamber, crating the same pressure on both sides of the
diaphragm. The pressure in the upper chamber acts on a
lesser ( less outlet area ) area of the diaphragm. This
keeps the diaphragm pressed down on the outlet port, closing
it. |
 The
upper chamber is connected to the atmosphere through
the air passage in the pilot base. The plunger in "normal"
conditions keeps the air passage closed, maintains the
pressure in the upper chamber and hence the diaphragm
valve closed.
When electric supply is given to the solenoid coil,
the plunger lifts within the core tube and the compressed
air in the upper chamber exhausts quickly to the atmosphere.
Because the exhaust air passage has a higher flow rate
than the bleed hole on diaphragm, the pressure in the
upper chamber falls suddenly. The pressure in the lower
chamber then lifts the diaphragm, causing the compressed
air to flow from inlet through outlet. 
When the solenoid is de-energised, the plunger closed
the air passage resulting resulting in the diaphragm
closing the valve outlet. |
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Valve Disassembly & Reassembly
Depressurise valve, turn off electric supply and proceed
as per steps below :
Loosen plug screw and remove PLUG CONNECTOR
(1) from COIL (2).
Remove coil retaining NUT (4) and slip COIL (2) off
CORE TUBE (5)
Loosen core sleeve and remove CORE TUBE (5) from PILOT
BASE (10), The PLUNGER (7) AND SPRING (6) come loose.
Loosen screw holding PILOT BASE (9) to valve COVER (12)
and remove PLOT BASE (9). The 2nd rubber O-RING (8)
comes loose.
Loosen COVER SCREWS (13) and remove COVER (12) and DIAPHRAGM
(15) from valve BODY (14). [The valves model 114 - 116
- 120 - 124 with larger capacity have two stages (two
diaphragms (15-17) to allow a standard small pilot solenoid
valve to control them.
Loosen and remove screws (13-19) both from the PILOT
CAP (12) of the smaller SECOND STAGE DIAPHRAGM (17)
and from the COVER (18) of the MAIN DIAPHRAGM (15)].
All parts are now accessible for cleaning or replacement,
Clean the air passage in PILOT BASE (9) . Replace worn
or damaged parts.
Reassemble in reverse order paying careful attention
to exploded view.
Clean the bleed hole and replace diaphragm (15) with
the steel plate up facing the cover.
Tighten the COVER SCREWS (13) to 10 + / - Nm. And the
COVER SCREWS (19) of the MAIN DIAPHRAGM (15) to 18 +
/ - Nm. Tighten the PILOT BASE SCREWS criss-cross, Tighten
the plug connector screw.
After reassembly, operate the valve a few times to be
sure of proper opening and closing.
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Installation
The valve body has threaded inlet / outlet ports for
installating the valve in the Bag Filter. The inlet
port (marked 'IN' ) is connected to the compressed air
header and, the outlet port to the compressed air distribution
pipes.
The valves can be mounted in any position.
Apply pipe compound sparingly to male pipe threads only
; if applied to valve threads, it may enter valves and
cause operational difficulty.
Pipes strain should be avoided by proper support and
alignment of piping. When tightening pipe, do not use
valve as a lever. Wrenches applied to valve body or
piping should be located as close as possible to connecting
point.
Do not over tighten pipe connection to avoide damage
to the valve body.
The voltage to be given to the coils is marked on the
valves.
Nominal voltage tolerance
{DC-5%+20%
{AC-10%+20%
Power consumption
{31W DC current
{19VA AC current
The valve is fitted with standard components and hence
suitable for compressed air temperature of -20o to 80oC.
For higher temperatures, special components are available.
Electrical connection is given to the plug connector.
Remove the connector screw and pull out the plug. The
connector can be removed from its cover.
While fitting the plug connector back to coil, ensure
that the rubber gasket is put in place properly. |
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Maintenance
Warning : Turn off electrical supply and depressurise
valve before making any repairs. It is not necessary
to remove the valve from pipeline during maintenance.
Cleaning : A periodic cleaning of valve is desirable.
The time between cleanings will depend on the compressed
air and duty conditions. In general, if the voltage
to the coil is correct, sluggish valve operation excessive
leakage or noise will indicate that cleaning is required.
Preventile maintence :
Keep the compressed air clean, dry and from oil.
Check the valves at least once a month to ensure proper
opening and closing.
Periodically inspect valve internals for damage, wear
or clogging of the bleed hole on the diaphragm and on
the pilot base. Throughly clean and replace worn / damaged
parts.
While replacing the Diaphragm tighten the screws in
criss - cross manner.
Improper operation
Check for and ensure supply to solenoid coil.
Check for "BURN OUT" of coil and replace if
faulty.
Check and ensure voltage to coil is at least 90% of
rated.
Coil is designed to accept + 20% or more over the voltage
marked on the valve. A higher voltage to coil is possible
and desirable. On the contrary a voltage to coil less
than 90% of rated could cause malfunction.
Check and ensure pressure of compressed air , 2kg to
7 kg/cm2
If fault not corrected with above, disassemble valve,
clean and replace worn/damaged parts
Recommended Spare parts
The spare parts required and available are :
-Coil (specify voltage)
-Diaphragm (specify valve size)
-Pilot group (includes O-rings , pluger , plunger spring).
MANIKS reserves the right to make changes
in the design and/ or construction at any time without
incurring any obligations on units previously sold.
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