Emerson Asco 390 Serie Instrucciones De Puesta En Marcha Y Mantenimiento página 2

DESCRIPTION
The pressure operated 3/2 valves series 390 with self-
aligning discs, NC or NO, have an excellent fl owrate.
Depending on the version, the valves are equipped with
a piston-type operator of dia. 63, 90 or 125 mm.
The valve bodies are available in bronze. The seals are
made from PTFE.
FUNCTION
NC - normally closed (see corresponding drawing). The
valve is closed when the 3/2 pilot valve NC is idle.
The valve is open when the 3/2 pilot valve NC is energised.
Pressurisation fl uid entry under the disc at port 3 (anti-
waterhammer design).
NO - normally open (see corresponding drawings). The
valve is open when the 3/2 pilot valve NC is idle.
The valve is closed when the 3/2 pilot valve NC is energized.
Fluid entry under the disc at port 3 (anti-waterhammer
design).
!
See corresponding product leafl ets (on valves and
pilot valves) for min./max. pilot pressure, operating pressure
differential and fl uid temperature.
PUTTING INTO SERVICE
The valves are designed to be operated within the technical
characteristics specifi ed on the nameplate. Modifi cations to
the products may only be made with the manufacturer's or
his representative's prior consent. Before installation, the
piping system must be depressurized and cleaned inside.
Read all information on the label: code, port, fl uid (type,
pressure, temperature), pilot fl uid, pilot pressure and
serial number.
CAUTION:
Do not exceed the safe static pressure of the valve. Installation
and maintenance of the valves must be carried out by qualifi ed
personnel only.
Fitting position
The valves can be mounted in any position. For easy
access to the pilot port, the pilot operators dia. 63, 90
and 125 mm are rotatable through 360°.
Connection
Remove the plastic protective plug from the pilot port
(see drawings NC and NO) and follow the connection
procedures for each version:
Connection of the pilot valve
• to the 1/8 port (dia. 63 mm operator), see leafl et on
pilot valves.
Observe a tightening torque (E) of 4 to 5 Nm.
• to the 1/4 port (dia. 90, 125 mm operator), see leafl et
on pilot valves.
Observe a tightening torque (F) of 6 to 7 Nm.
• The exhaust port plug mounted by the manufacturer
must never be removed.
Mounting on piping
Connect the piping as indicated on the body; see mounting
diagram on the valve's label. Grease the male threads of
the tapped pipes lightly (depending on the application).
Do not grease the female threads of the valve. Make sure
to avoid any foreign matter entering the system.
The piping must be supported and aligned correctly
to avoid any strain to the valves. Do not use the valve
as a lever when tightening. Locate wrenches as close
as possible to the connection point on the bodies and
pipes. To avoid damage to the equipment, DO NOT
OVERTIGHTEN pipe connections.
390 SERIES
MAINTENANCE
!
Prior to all maintenance work or putting into
operation, cut off the supply to the pilot, depressurize
the valve and vent it in order to prevent injury to life
or property.
Cleaning
Maintenance of the valves depends on the operating
conditions. They should be cleaned at regular intervals.
The intervals between two cleaning operations may vary
according to the nature of the fl uid, the working conditions
and the environment in which it is operated. During
servicing, the components must be checked for excessive
wear. The valves must be cleaned when a slowing down of
the cycle is noticed although the pilot pressure is correct
or if an unusual noise or a leak is detected. At worst, this
may lead to a malfunction of the valve and it may not open
and close correctly any more.
Operating noise level
The noise level varies according to the application, fl uid
and equipment used. It is therefore up to the person
putting the component into operation in his installation
to give his opinion on its noise level.
Preventive maintenance
• Put the valve at least once a month into operation to
check if it opens and closes.
• The disc seals are available as spare parts for repairs.
Should any diffi culties arise during installation or
maintenance, or should you have any questions,
please contact ASCO Numatics or their authorised
representatives.
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Trouble-shooting
• Wrong exhaust pressure: Check the pressure on the
supply side of the valve, it must correspond with the
values indicated on the nameplate.
Caution: The minimum pilot pressure in NO must be
observed (see corresponding leafl ets).
• Leaks: Disassemble the valve body and clean the internal
parts. If necessary, replace the disc seals.
Make sure that no foreign matter enters the valve and
piping during the process.
ASSEMBLY / DISASSEMBLY INSTRUCTIONS
!
Before any maintenance or reconditioning work
is carried out, de-energise the pilot, depressurise the
valve and drain it. During reassembly/reinstallation,
it will be necessary to repressurise the pilot system.
NC VALVES
1. Disconnect the valve from the pipes (at least ports
2 and 3), then apply and maintain the pilot pressure
(10 bar max.).
2. Unscrew and disconnect port 3 of the valve, and remove
the seal (Item 8).
3. Release the pilot pressure.
4. Turn the operator or core so as to orientate the valve
stem so that the two fl ats (Item b) are opposite port 2.
5. Through port 2, introduce removal wrench (B) and
prevent the valve stem from turning. Take care not to
damage the valve seat during this operation.
6. Unscrew the core nut (Item 7) with the wrench (C).
Remove the nut, the core and its washers. Remove
the wrench (B).
4
!
NC valve: do not pilot the operator after remov-
ing the core as there is a risk of destroying the sight
glass of the optical indicator.
Depending on the maintenance operation, perform the
following actions.
Replacement of seal packings: phases 11 to 15 and/or
gland body seal (1): phases 7 to 15.
7. Unscrew the gland body (A) and remove the control
head assembly and seal (Item 1).
8. Clean the parts thus made accessible and replace the
seal (Item 1).
9. Reinstall the control head assembly and tighten the
gland body to torque (A).
10. Repeat disassembly phase 5.
11. Clean the end of the stem and the core. Replace the
core seal (Item 4), the core packing (Items 3 to 5), the
washers (Items 2 to 6) and the nut (Item 7).
!
The washer with the larger hole is placed on the
control rod side and that with the smaller hole on the
nut side.
12.Tighten the core nut to torque (C).
13.Remove the wrench and pilot the operator.
14. Disconnect the third port and replace the seal (Item 8).
Tighten to torque (D).
15. Disconnect the pressure supply from the pilot and re-
install the valve on the pipes following the procedure
indicated in the preceding pages.
NO VALVES
1. Disconnect the valve from the pipes (at least ports 2
and 3).
2. Unscrew and disconnect port 3 of the valve, and remove
the seal (Item 8).
EN
3. Apply the pilot pressure (10 bar max.) and main-
tain it throughout the following operations.
Replace the core packings and/or the gland seal:
see phases 4 to 12 above, while maintaining the pilot
pressure.
14. Remove the wrench and disconnect the pressure sup-
ply from the pilot.
15. Disconnect the third port and replace the seal (Item 8).
Tighten to torque (D).
16. Reinstall the valve on the pipes following the procedure
indicated in the preceding pages.
!
Prior to putting the valve into operation, check for
correct operation of the valve in order to prevent injury to
life or property. Also check for possible internal or external
leaks (seats) using a non-explosive and non-infl ammable
fl uid.
513357-001
390 SERIES
EN
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EN
513357-001