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XLW Valve Actuator
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There are many applications where it can be a
benefit to operate the Actuators using pressurised water instead of
compressed air. This can be particularly useful in remote areas where
compressed air is not available.
The most common situation is when using mains water
supply which is normally in the pressure range from 4 - 7 bar
(60-100psi).
Standard XL Actuators have been used successfully in
many water applications but Hytork® recommends that XLW Actuators are
used in this application to assure smooth and reliable operation.
Hytork® XLW Actuators are specifically prepared for
operating by water. This preparation is concerned with corrosion
protection, bearings and the preventing the ingress of particles with
the water. Contaminated water can cause damage to the Actuator Seals and
bearing areas and reduce the operating efficiency and Actuator life.
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Corrosion Protection |
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Aluminium Components:
- Aluminium body components on
Hytork®'s standard XL Actuators are treated with
CERAMIGARD,
a unique Di-Aluminium Tri-Oxide (AL203)
surface treatment, which provides a hard, corrosion resistant,
ceramic-like coating protecting all body parts against wear and
corrosion.
This CERAMIGARD finish is particularly efficient in water applications
and many years of site experience with water operation and water in
air lines has shown excellent protection against corrosion.
Pinion: (4)
- The finish on the Pinion will, in most
cases, be the standard XL treatment. There are certain applications
(as with high chlorine concentrations, for example) where one of the
HYTORK® CORROGARD Fluropolymer treatments may be more suitable. HYTORK®
will be pleased to give exact details of the finish required once the
specification of the water is known.
Spring Return Actuators:
- The Springs are protected by an
Electro Phoretic finish as standard.
External Surface Finish:
- The externals of all XLW Actuators are
treated with a long cure, two part epoxy coating to provide extra
protection against aggressive environments.
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Differences Between Standard XL and XLW Actuators |
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Part No.
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Component |
Quantity
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Differences between
the Standard XL and XLW Models |
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1
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Travel stops
& Seals |
2
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Standard XL |
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2
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End Caps |
2
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Standard XL |
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3
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Pistons |
2
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Standard XL |
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4
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Pinion |
1
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Standard XL or CORROGARD
finish |
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5
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Body |
1
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Standard XL |
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6
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SAFEKEY & 'O' Rings |
2
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Standard XL |
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7
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Springs* |
2, 3 or 4
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Standard XL |
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8
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Retractor Caps* |
2
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Standard XL |
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9
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Pinion Radial Bearings |
2
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DURASTRIP 'W' |
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10
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Piston Bearings |
2
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DURASTRIP 'W' |
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11
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Piston 'O' Rings |
2
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Standard XL |
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12
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End Cap 'O' Rings |
2
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Standard XL |
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13
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Pinion 'O' Rings |
2
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Standard XL |
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14
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Thrust Bearings |
2
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DURASTRIP 'W' |
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15
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Steel Thrust Washers |
2
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Standard XL |
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16
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Snap Ring (Circlip) |
1
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Standard XL |
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17
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Position Indicator |
1
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Standard XL |
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18
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Sealing 'O' Ring* |
2
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Standard XL |
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19
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Sealing Bolts* |
2
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Standard XL |
*Spring Return models only
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Bearings |
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DURASTRIP 'W' Bearings
- Continuous immersion in water
will cause the standard XL Bearing to wear prematurely. To maximise
Actuator Bearing life DURASTRIP 'W' Bearings are used.
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Operating Media |
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XLW Actuators can be operated by clean
air or filtered water. The water must be clean and free from any
particles that could damage the Seals or score the Actuator cylinders.
Solenoid directional control Valves require a clean operating media and
any form of contamination may cause the spool to stick.
Water Filtration.:
- It is recommended that a filter
of 10 microns be used on all water supplies. Failure to use clean
water will reduce Actuator life and may
cause malfunction of both the Actuator
and directional control Valve.
- 5.3 Maximum Operating Pressure
- XL models 45 to 2585
- Do not exceed 8.3 bar (120 psi)
- XL models 4580
- Do not exceed 7 bar (100 psi)
The normal XL operating pressures should
be adhered to unless HYTORK® has given specific authorisation in writing
that this may be increased. The fact that water is virtually
incompressible means that it may be possible to utilise higher pressures
in certain applications. If you have an application where higher
operating pressures are required please consult HYTORK® with full details
for an assessment to be made. |
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