Emerson Hytork XL26 Installation, Operation & Maintenance Instructions Manual page 3

Installation Operation & Maintenance Instructions
MAC050515 EN Rev. C
May 2016
Spring return actuator
operation
Fig. 2 Solenoid operation
4.2 Travel Stop Adjustments
1 Operate valve/actuator assembly to the open position.
2 Remove air supply.
3 Slacken locknut (24) on the "closed" stop (marked "2").
4 Turn the "closed" stop clockwise to reduce or counter clockwise
to increase the travel.
5 Tighten the lock nut.
6 Connect air and check that the position is correct. If not repeat
from 2.
7 Operate valve/actuator assembly to the "closed" position.
8 Remove air supply.
9 Adjust "open" travel stop (marked "1") as from step 3 to 6.
5 Piping Instructions
(See Fig. 2) All Actuators can be either piped with solid or flexible
tubing with the solenoid valve mounted remotely from the actuator or
by mounting a NAMUR designed solenoid valve DIRECTLY onto the
NAMUR mounting pad on the side of the actuator.
6 Solenoid Valves on Spring Return Actuators
(See Fig. 3) It is recommended that on Spring Return Actuators,
the HYTORK "CATS" Solenoid Valves are used. These Valves are
specially designed to prevent contamination of the internals of the
Actuator by dirt from the atmosphere. This increases the working life
of the Actuator which reduces down time and maintenance periods.
7 Position feedback
All position feedback or positioning accesories, that comply to the
VDI/VDE 3845 (NAMUR) standard, can be mounted easily on top of
Hytork XL actuators. To access the pinion top, remove the position
indicator.
8 Spares Recommendations
When disassembling and carrying out maintenance work on the
XL Actuator, a HYTORK Spares Kit must be used to replace all 'O'
Rings, DURASTRIP Bearings, Washers etc. This Kit is available
from Emerson Process Management or its Stocking Distributors.
Double acting actuator
operation
Spring stroke operation
Fig. 3 HYTORK "CATS" Solenoid Valve
9 Disassembly procedure
9.1 End cap and springs dis-assembly on Spring
Return actuators
1 Release Locking Nuts (24) and remove both Travel Stops (22)
and Thread Seals (23) or 'O'-rings (23a).
2 Remove the Indicator (7) from the top of the Pinion (19) For XL26
to XL221 use an Allen key size 4mm. For the larger sizes the
Indicator can by pulled from the pinion top.
3 Remove both Sealing Bolts (28) and seals (29) from the End
Caps (21).
4 Place both the HYTORK Retractor Rods through the hole in the
End Caps and screw the Rods into :
- For XL 26 to XL 681 the Pistons (20)
- For XL 1127 to XL4581 the Retractor plate (20a, see also Fig
5) until travel is stopped (DO NOT OVERTIGHTEN) and take
care the nut and washer being free of the End Cap face.
5 Turn back the Rod 1/2 turn.
6 Screw the adjusting nut and washer by hand clockwise down
the Retractor Rod until they come up against the face of the End
Cap.
7 Prevent the "hold-nuts " to rotate by one wrench. Use another
wrench, to screw both adjusting nuts half turn at a time (see Fig.
5) clockwise down the Rods until the end cap loosens (Maximum;
approximately two complete turns). This draws the;
- For XL 26 to XL681 the Pistons (20)
- For XL 1127 to XL4581 the Retractor plate (see also Fig 5) to
the end caps (21) and compresses the springs. This Spring-
compression, releases the Spring force and un-locks the
SAFEKEY for removal.
8 Rotate the Caps to ensure that the Springs are retracted; if the
Cap will not turn easily, a gentle tapping with a plastic hammer
against the endcap will loosen the end cap.
9 Unscrew the two slotted SAFEKEYS (13/14), and gently pull
each SAFEKEY from the Body. If the SAFEKEY resists removal,
gently tap the End Cap with a soft hammer to assist release.
10 When both SAFEKEYS have been removed, use a wrench to
rotate the Pinion, driving the pistons (20) apart until they partially
push the End Caps from the Body.
- For XL 26 to XL681 the Pistons (20), springs and end cap will
come out
- For XL 1127 to XL4581 the Retractor plate, springs and end
cap will come out.
Hytork XL
Air stroke operation
Page 3