Mesto QUADRA-POWR X Operating and maintenance manual

IMO-215 EN • 10/2019
QUADRAPOWR® X
Spring Diaphragm Actuators
Installation, Maintenance and
Operating Instructions

IMO 10/19
2 IMO-215 EN
READ THESE INSTRUCTIONS FIRST!
These instructions provide information about safe handling and operation of the actuator.
If you require additional assistance, please contact the manufacturer or manufacturer’s representative.
Addresses and phone numbers are printed on the back cover.
SAVE THESE INSTRUCTIONS!
Subject to change without notice.
All trademarks are property of their respective owners.
TABLE OF CONTENTS
1. GENERAL................................................................... 3
1.1 Warning............................................................................. 3
1.2 Handling QUADRAPOWR X Actuators.................. 3
2. INSTALLATION.......................................................... 3
2.1 Operation ......................................................................... 4
3. MAINTENANCE......................................................... 4
3.1 Disassembly..................................................................... 4
3.2 Assembly .......................................................................... 5
3.3 Parts lists and Bill of the Materials........................... 6
4. ACCESSORIES ........................................................... 7
4.1 100% Adjustable Stop (AS) ....................................... 7
4.2 Mechanical Lockout (LD) ............................................ 7
4.3 1” NPT Air Inlet (F).......................................................... 7
4.4 Manual Jackscrew Override (MJX)........................... 7
4.5 Manual Override Gearbox (SRO).............................. 9
4.6 Fusible Plug (LK-3116) ...............................................10
5. REPAIR KITS/SPARE PARTS .................................... 10
6. HOW TO ORDER ..................................................... 11

IMO 10/19
IMO-215 EN 3
1. GENERAL
This instruction manual contains important information
regarding the installation, operation and troubleshooting
of Quadra-Powr X Spring-Diaphragm Actuators.
This unique spring-diaphragm actuator designed for rotary
valves provides safe, smooth and reliable valve actuation at
minimal pressures and up to 100 psi (6.9 BAR). As the use
of the Quadra-Powr X is application specic, many factors
should be considered when selecting an actuator for given
application. Therefore, some of the situations in which the
actuators are used are outside the scope of this manual. If
you have any questions concerning the use, application
or compatibility of the actuator with the intended service,
contact Metso fo more information.
Please read these instructions carefully and save them for
further reference.
1.1 WARNING
LOSS OF AIR PRESSURE MAY CAUSE SPRINGRETURN ACTUATORS
TO MOVE TO THEIR‘FAILURE’POSITION.
APPLYING AIR PRESSURE OR CONTROL SIGNAL TO VALVE/
ACTUATOR ASSEMBLY MAY CAUSE THE ASSEMBLY TO OPERATE.
BEWARE OF MOVEMENT OFTHE VALVE AND ANY LINKAGE BETWEEN
IT AND THE ACTUATOR. KEEP HAND, BODY PARTS, TOOLS AND
OTHER OBJECTS OUT OF THE WAY OF MOVING PARTS. FAILURE TO
DO THIS MAY RESULT IN DAMAGE OR PERSONAL INJURY!
ALWAYS KEEP HANDS AND CLOTHING AWAY FROM THE VALVE
PORTS. A CLOSING VALVE ACTS AS A CUTTING DEVICE.
DO NOT TRY TO MANUALLY OPERATE A PRESSURIZED ACTUATOR.
NEVER DISASSEMBLEA PRESSURIZED ACTUATOR! DISASSEMBLING
A PRESSURIZED ACTUATOR WILL LEAD TO UNCONTROLLED
RELEASE OF PRESSURE. SHUT OFF SUPPLY PRESSURE AND RELEASE
THE PRESSURE FROM THE ACTUATOR BEFORE DISASSEMBLY.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
DAMAGE OR PERSONAL INJURY!
DISASSEMBLY OF A SPRINGRETURN ACTUATOR MAY BE DANGEROUS.
NEVER ATTEMPT TO DISASSEMBLE THE SPRING CARTRIDGE
ASSEMBLY OF A SPRINGRETURN ACTUATOR. DISASSEMBLY OF THE
SPRING CARTRIDGE ASSEMBLY MAY RESULT IN SERIOUS PERSONAL
INJURY! IF MAINTENANCE IS REQUIRED THE ENTIRE SPRINGRETURN
ACTUATOR SHOULD BE DIRECTED TO A METSO SERVICE CENTER.
SHUT OFF AND BLEED ALL SUPPLY LINES BEFORE INSTALLATION OR
SERVICING THE ACTUATOR.
BEFORE INSTALLING THE VALVE AND ACTUATOR, BE SURE THAT
THE INDICATOR POINTER ON TOP OF THE ACTUATOR AND THE
IDENTIFICATION PLATE IN FEMALE ACTUATORS ARE CORRECTLY
INDICATING THE VALVE POSITION. FAILURE TO ASSEMBLE THESE
PRODUCTS TO INDICATE CORRECT VALVE POSITION COULD RESULT
IN DAMAGE OR PERSONAL INJURY!
THE ACTUATOR MUST BE SIZED ACCURATELY FOR PROPER
OPERATION. REFER TO INFORMATION ON THE ACTUATOR END OF
STROKE TORQUES AND THE APPROPRIATE VALVE BULLETIN FOR
OPERATING TORQUES.
WHEN SERVICING A VALVE ACTUATOR ASSEMBLY, THE BEST
PRACTICE IS TO REMOVE THE ENTIRE ASSEMBLY FROM SERVICE.
IF THE ACTUATOR IS REMOVED FROM THE VALVE, IT SHOULD
BE REMOUNTED ON THAT SAME VALVE AFTER SERVICING IS
COMPLETED. THE ACTUATOR MUST BE READJUSTED FOR PROPER
“OPEN”AND“CLOSE”POSITION EACH TIME IT IS REMOUNTED.
DO NOT USE VDI/VDE MOUNTING HOLES TO LIFT AN ACTUATOR.
OPERATING AN ACTUATOR ABOVE ITS TEMPERATURE LIMITS MAY
DAMAGE INTERNAL AND EXTERNAL COMPONENTS AND MAY
RESULT IN PERSONAL INJURY!
OPERATING OVER THE PUBLISHED PRESSURE LIMITS OF THE
ACTUATOR MAY RESULT IN DAMAGE OR FAILURE OFTHE ACTUATOR
HOUSING, AND MAY RESULT IN PERSONAL INJURY!
1.2 Handling Quadra-Powr X Actuators
When handling the actuator or valve/actuator assembly,
take its weight into account! Approximate actuator weights
are shown in Table 1. Never lift the actuator or valve/
actuator assembly by the actuator positioner, limit switch,
their piping, or an NPT air connection. Handling of the
actuator should be accomplished using lifting straps as
shown in Figure 1. Failure to follow these instructions may
result in damage or personal injury from falling parts. Obey
any local or national requirements.
2. INSTALLATION
1. Check to see that the position indicator on the actuator
is assembled correctly for the desired failure mode, either
spring-to-close or spring-to-open. In the spring-to-close
mode, the actuator will cycle clockwise to close upon loss
of pressure. In the spring-to-open mode, the actuator will
cycle counterclockwise to open upon loss of pressure.
2. If the actuator is not set up in the conguration desired,
remove the four hex head screws (33), indicator plate (12),
indicator pointer (24), and remount them on the opposite
mounting surface. In the female actuators, the fastener
identication plate shows the failure mode of the actuator.
Table 1
Handling Quadra-Powr X Actuators
Actuator Series Approx. Weight kg (Lb.)
QPX1 12 (26)
QPX2 18 (39)
QPX3 30 (65)
QPX4 48 (105)
QPX5 94 (205)
QUADRA-POWR
Figure 1.

IMO 10/19
4 IMO-215 EN
SPRING-TO-CLOSE
In this mode, the actuator will cycle clockwise
to close upon loss of pressure
SPRING-TO-OPEN
In this mode, the actuator will cycle counterclockwise
to open upon loss of pressure
Figure 2.
3. Mount the actuator to the valve following the directions
in the AMI (Actuator Mounting Instructions) or valve IMO.
4. Connect a regulated air supply to the 3/8" NPT tting
in the diaphragm casing (15). CAUTION: The maximum
operating pressure is 100 psi (6.9 BAR).
5. Adjust the stop screws (19) by releasing the jam nut (23)
and turning. Stops can only be adjusted when driver
arm (3) is o the stop screws being adjusted. (Maximum
rotation adjustment ±5˚.) Be sure to retighten jam nut (23).
2.1 Operation
The operating pressure, output torque and drive type
is determined by the actuator designation. Maximum
operating pressure is 100 psi (6.9 BAR). (See Table 2)
Actuator designation example: QPX4C/K40 is a series QPX4
spring diaphragm actuator that has a 60 psi (4.1 BAR) spring,
an end of air pressure stroke output torque of 200 FT•LBS
(272 N•m) and uses a 40 mm female key to drive the valve.
Before operating make sure all tapped holes in the body
which are not being used are resealed with fasteners.
3. MAINTENANCE
Although Metso’s Jamesbury actuators are designed to work
under severe conditions, proper preventative maintenance
can signicantly help to prevent unplanned downtime and
in real terms reduce the total cost of ownership. Metso
recommends inspecting actuators at least every ve (5)
years. The inspection and maintenance frequency depends
on the actual application and process condition.
Before working on a Quadra-Powr X actuator, note that all
fasteners except socket head shoulder screw (8) and hex
head cap screw (88, on QPX4 & QPX5) are metric.
Table 2
Actuator
Series
Spring
Version
Operating
Pressure
in psi
(BAR)
End of Spring
Stroke
Torque in
FT•LBS (N•m)
Drive Type
QPX1 C 60 (4.1) 25 (34) K15 - 15 mm Keyed
M - 9/16” Square
QPX2
A** 20* (1.4) 11 (15)
B 40 (2.8) 38 (52) K20 - 20 mm Keyed
M - 9/16” Square
C 60 (4.1) 57 (77)
D 80 (5.5) 74 (100)
QPX3
A 20* (1.4) 26 (35)
K35 - 35 mm Keyed
M - 3/4” Square
B 40 (2.8) 76 (103)
C 60 (4.1) 114 (155)
D 80 (5.5) 146 (198)
QPX4
B 40 (2.8) 153 (207) K40 - 40 mm Keyed
M - 1” Square
C 60 (4.1) 229 (310)
D 80 (5.5) 294 (399)
QPX5
B 40 (2.8) 305 (414) K40 - 40 mm Keyed
M - 1” Square
C 60 (4.1) 458 (621)
D 80 (5.5) 587 (796)
* For Direct Control Application
** QPX2A only available with QPX1 drive type options.
Under normal operating conditions the actuator requires
only periodic observation to ensure proper adjustment.
Standard replacement of “soft” parts in Quadra-Powr X
actuators consists of items numbered 6, 14, 31, 62 and 64.
See REPAIR KITS/SPARE PARTS Section.
1. When replacing the diaphragm use caution and be sure
the air supply is disconnected. Back o nuts (29) from
the hex head screws (27), holding the diaphragm casing
and spring housing together until the nuts are ush
with the hex head screw ends. Do not remove the nuts
completely from the hex head screws. If tension still
exists on the hex head screws, then the spring package
is not properly contained. Stop disassembly: retighten
nuts and return the actuator to the factory. If the spring
package proves to be intact remove the nuts (29) and
remove the hex head screws (27).
2. Lift o diaphragm casing (15). Remove hex head cap screw
(88) and retaining washer (89). Remove diaphragm (14).
3. Inspect the inside of both the diaphragm casing (15) and
the spring housing (32) for any rough spots or foreign
matter which may cause abrasion to the diaphragm.
4. Place the new diaphragm (14) on the diaphragm retainer
(10). Do not pinch or stretch the diaphragm. Attach
with washer (89) and cap screw (88). Tighten to value in
(Table 3) keeping spring housing (32) holes aligned with
diaphragm (14) holes. Place the diaphragm casing (15)
on the spring housing (32) and line up all the holes.
5. Insert hex head screws (27) in all holes. Do not force the
hex head screws through the diaphragm. Install nuts
(29) on screws and tighten uniformly using the standard
practice of tightening diametrically opposite bolts in
sequence with the torque requirements from (Table 3).
3.1 Disassembly
When disassembly of the actuator is required for
maintenance, remove the actuator to a clean well lit area.
Handling of the actuator is accomplished by using lifting
straps. See Section 1.2.
CAUTION: Disconnect any pneumatic or electrical supplies,
and vent any air pressure in the actuator before attempting
any disassembly.

IMO 10/19
IMO-215 EN 5
Obtain the following tools: two (2) M10 wrenches, preferably
one being a ratchet, one (1) hex (Allen) wrench, 3 mm for
QPX1, 5 mm for QPX2, 3 and 4, 6 mm for QPX5, one (1)
screwdriver, one (1) plastic faced mallet.
1. Remove the cover (5) by removing six (four on QPX1)
socket cap screws (21). If the cover cannot be removed,
tap it with a plastic hammer to break the adhesion of
the paint between the body and cover joint.
2. Use air pressure to remove spring preload by partially
stroking the actuator. If the diaphragm (14) is ruptured,
replace as instructed in the previous section.
3. To remove the socket shoulder screw (8) (or socket cap
screw in QPX1) that holds the clevis (7) to the driver arm
(3), rst apply some heat to the lower arm to loosen
the Loctite® on threads of the socket shoulder screw.
CAUTION: DO NOT place ngers or hands inside Driver
Housing when disconnecting Clevis from Driver Arm.
4. Slowly increase air pressure until the driver arm (3)
moves slightly o the stop screw (19). Remove the
socket shoulder screw (8).
5. Slowly relieve the air pressure in the actuator. The clevis (7)
should be set against the spring retainer (30), and positioned
symmetrically about the slot in the spring housing.
6. Shut o and bleed the air pressure to zero. Disconnect
the air lines.
7. Remove the hex head screws (27) and hex nuts (29)
holding the diaphragm casing and spring housing
together. CAUTION: DO NOT remove diaphragm casing
hex head cap screws (27) and nuts (29) or diaphragm
casing while the actuator is pressurized.
8. Lift o diaphragm casing (15), remove hex head cap
screw (88), washer (89) and diaphragm (14). Inspect
the diaphragm for signs of wear, rupture or mechanical
damage.
9. Inspect the inside of both the diaphragm casing and
spring housing, as well as the outside of the diaphragm
retainer for any rough spots or foreign matter which
may cause abrasion of the diaphragm.
10. Lift the entire spring cartridge out of the unit.
WARNING:
DISASSEMBLY OF THE SPRING PACKAGE SHOULD NOT BE
ATTEMPTED. SPECIAL EQUIPMENT IS REQUIRED. DISASSEMBLY OF
THE SPRING PACKAGE MAY RESULT IN SERIOUS PERSONAL INJURY. IF
MAINTENANCE IS REQUIRED SHIP THE ENTIRE ACTUATOR TO METSO.
It is usually not necessary to remove the spring housing
(32) from the body (1). However, if removal is required, heat
must be used to loosen the Loctite®. When reassembling,
the information in (Table 3), torque and Loctite®
recommendations must be met. All fasteners should use
Loctite® 271 on the threads. Inspect and clean all components.
Good practice dictates that all bearings should be removed
and replaced. See section 5 of this IMO for the proper
actuator series repair kit number.
3.2 Assembly
To aid assembly, spread light oil or grease on the outside
diameter of the new bearings.
1. Press driver arm bearings (6) into the body (1) and covers
(5). This is best done in an arbor press, but a vise could be
used if care is taken not to damage the bearing. Driver arm
bearings are to be pressed in until they are ush or 0.015
in. (0.38 mm) below the body counterbore or the inside
cover surface. Press clevis bearings (62) into the clevis (7).
2. Apply lubricant, MOLYKOTE® GN grease on the barrel
of shoulder screw (8) prior to assembly. Also, apply
MOLYKOTE ® GN grease to driver arm bearings (6).
3. Place the thrust bearing (31) into the counterbore in the
body of QPX1-QPX5 actuators. Slide the other thrust
bearing onto the trunnion of the driver arm (3). Place the
driver in the body.
4. Spring housing (32), diaphragm retainer (10) and springs
shall be lubricated with Kendall L-427 Super Blu® or
Mobilgrease™ XHP 222. Lower the spring cartridge into
the spring housing (32). Make sure that the spring package
is not resting on the hex head cap screws (38) which hold
the spring housing and body together. If bearing (64) has
separated from diaphragm retainer (10), hold in place
while lowering spring cartridge into housing.
5. Place the new diaphragm (14) on the diaphragm plate.
Attach diaphragm (14) to diaphragm retainer (10) using
washer (89) and hex head cap screw (88). Torque to the
value specied in (Table 3).
6. Insert the hex head bolt (27) in all holes. Do not force the
bolts through the diaphragm. Install nuts (29) and tighten
uni-formly using the standard practice of tightening
diametrically opposed bolts (criss cross pattern) in
sequence. Follow (Table 3) for tightening torques.
7. Connect a regulated air supply to the pressure port
and slowly increase the air pressure until the holes in
the clevis and driver arm are aligned. Turn clevis a few
degrees, if required, to align holes.
8. Apply Loctite® 271 on the threads of the shoulder screw.
Insert it through the driver arm and clevis. Tighten per
(Table 3).
9. Slowly release air pressure. Assemble cover by using the
socket head screws (21). Apply tightening torque per
(Table 3).
10. Install the indicator pointer (24) if this was previously
disassembled. In female actuators make certain that the
indicator points to the inscribed line in the driver arm. In
male actuators, hold the indicator pointer in place with a
retaining ring (9). NOTE: Refer to Installation instructions
for spring-to-close or spring-to-open conguration.
Table 3
Torque Requirements
Required Tightening Torques In FT•LBS (N•m)
For Various Fasteners
QPX1 QPX2 QPX3 QPX4 QPX5
Nuts for Hex Head
Screws through
Diaphragm Casing (29)
24
(32)
24
(32)
24
(32)
24
(32)
24
(32)
Socket Head
Cover Screws (21)
4
(5)
6
(8)
6
(8)
6
(8)
15
( 20)
Socket Head
Shoulder Screw (8)
35
(48)
55
(75)
132
(179)
132
(179)
132
(179)
Nuts on Actuator
Rod (74)
55
(74)
55
(75)
88
(119)
132
(176)
176
(239)
Hex Head Screws
between Body and
Spring Housing (38)
5
(7)
18
(24)
30
(40)
30
(40)
55
(75)
Hex Head Cap Screws for
Attaching Diaphragm to
Diaphragm
Retainer (88)
19
IN•LBS
(1)
19
IN•LBS
(1)
27
IN•LBS
(2)
10
FT•LBS
(14)
17
FT•LBS
(23)

IMO 10/19
6 IMO-215 EN
3.3 PARTS LIST AND BILL OF MATERIALS
21 33 24
82 86
12
5
6
3
31
35 1
81
23
19
71
80 32 29
26
53
38
30
43
64
10
14
89
88 15
45
37
27
26
8
4
7
FEMALE
DRIVE
KEYED
FOR QPX3,4,5
62
31
6
40
21
5
MALE
DRIVE
86
3
9
24
12
33
Bills Of Materials And Parts
ITEM NO. PART DESCRIPTION QPX1 QPX2 QPX3 QPX4 QPX5
1 Driver housing 1 1 1 1 1
3 Driver arm 1 1 1 1 1
4 Actuator rod 1 1 1 1 1
5Cover 11111
6 y Driver arm bearing 2 2 2 2 2
7 Clevis 1 1 1 1 1
8 Shoulder screw 1 1 1 1 1
9 Retaining ring* 1 1 1 1 1
10 Diaphragm retainer 1 1 1 1 1
12 Indicator plate 1 1 1 1 1
14 x, y Diaphragm with centering hole 1 1 1 1 1
15 Diaphragm casing 1 1 1 1 1
19 Hex head cap screw 2 2 2 2 2
21 Socket head cap screw 4 4 or 6 6 6 6
23 Hex Jam Nut 2 2 2 2 2
24 Indicator pointer 1 1 1 1 1
26 Washer 16 24 24 32 48
27 Hex head cap screw 8 12 12 16 24
29 Nylon insert lock nut 8 12 12 16 24
30 Spring retainer 1 1 1 1 1
31 y Thrust bearing 2 2 2 2 2
32 Spring housing 1 1 1 1 1
33 Hex head cap screw 4 4 4 4 4
35 Set screw 1 1 1 1 1
37 NTP adapter N/A N/A 1 1 1
38 Hex head cap screw 4 4 6 10 10
40 Hex Jam Nut 1 1 1 1 1
43 Compression Spring 1 1 1 1 1
45 Attention plate 1 1 1 1 1
53 Identication tag 1 1 1 1 1
62 y Clevis bearing 2 2 2 2 2
64 x, y Bearing, diaphragm retainer 1 1 1 1 1
71 Breather 1 1 1 1 1
80 Hex Head Cap Screw 1 1 1 1 1
81 Name plate 1 1 1 1 1
82 Screw ** 2 2 2 2 2
86 Socket set screw** 8 8 8 8 8
88 Hex head cap screw 1 1 1 1 1
89 Diaphragm washer 1 1 1 1 1
* MALE ACTUATORS ONLY.
** FEMALE ACTUATORS ONLY.
x = Included with Diaphragm Service Kit
y = Included with Complete Service Kit
ISO & JB
MOUNTING
EXCEPT QPX3
ISO & JB
MOUNTING
EXCEPT QPX3
FEMALE
DRIVE
KEYED
MALE
DRIVE
FOR QPX3, 4, 5

IMO 10/19
IMO-215 EN 7
4. ACCESSORIES
4.1 100% Adjustable Stop (AS)
The standard Quadra-Powr can be congured in the eld
for a 100% adjustable stop. Remove the set screw plug (35)
with an allen wrench. Thread in the adjustable stop screw
enough to reach the desired stop position and allow room
for the lock nut. Screw on the lock nut for the adjustable
stop and tighten to secure it in place.
4.2 Mechanical Lockout (LD)
The standard Quadra-Powr can be congured in the eld
for a locking device to lock the actuator in its failsafe
position. Installation of the locking device does not require
adjustment of the standard open/close limit screws.
Installation (see Figure 3)
1. Before attempting to assemble lockout devices, make
certain that the actuator is not pressurized.
2. Remove the plug (80) using an allen wrench.
3. Remove the lower jam nut from the locking stud.
4. Insert the locking stud through the hole in the locking
plate. Thread the locking stud into the lockout hole and
tighten securely. Tighten the upper jam nut to secure
the locking plate. Pivot the locking cover down until the
hole in the cover lines up with the hole in the end of the
locking plate.
5. Secure the locking device with a padlock. A padlock
with 1/4" – 5/16" (6.35 – 7.9mm) diameter shackle is
recommended.
Removal and storage (see Figure 4)
1. Remove the padlock and swing the cover out of the way.
2. Loosen (do not remove) the upper jam nut and then
remove the locking stud.
3. With the locking stud still inserted through the large
hole in the locking plate, thread the lower jam nut onto
the bottom of the stud. This will secure the stud and
nuts for storage.
4. Re-insert the plug (item 80) into the locking hole. The
wire tie can be secured to the plug for storage of the
locking device.
Figure 3.
Figure 4.
4.3 1"NPT Air Inlet (F)
NOTE: Applicable only to QPX size 3 – 5.
Remove the 3/8" Reducing bushing (Item 37) to access the
1" NPT port.
4.4 Manual Jackscrew Override (MJX)
Figure 5.
The MJX is intended to move the valve upon failure of the
actuator, supply air, or electrical system. When the handwheel
of the manual jackscrew is turned clockwise, force is exerted
on the diaphragm retainer, compressing the actuator spring
and operating the valve in the direction of the air stroke.
Wire Tie
Wire Tie
Plug
Locking Cover
Locking Stud
Locking
Plate
Upper Jam Nut Tightened
ACTUATOR LOCKED
LOCKING DEVICE STORED
Upper
Jam Nut
Lower
Jam Nut

IMO 10/19
8 IMO-215 EN
Installation
WARNING:
SHUTOFF AND BLEED THE AIR SUPPLY LINE BEFORE INSTALLATION
OR SERVICING. IF THERE IS STILL SPRING PRESSURE ONTHE OVERRIDE
SHAFT WHEN IT IS BACKED OUT, ALL THE WAY COUNTER CLOCKWISE,
DO NOT DISASSEMBLE THE DIAPHRAGM CASING SCREWS.
1. On the actuator, remove the diaphragm casing from
the spring housing by removing the lock nuts (13), at
washers (12), and hex head cap screws (11).
2. Once the diaphragm casing is removed, inspect the
diaphragm for signs of damage and replace as needed.
3. On the MJX, turn the acme screw (2) counter clockwise
until the o-ring (6) and o-ring carrier (3) are seated inside
the MJX housing (1).
4. Install the MJX housing sub-assembly (1) in place of the
diaphragm casing using the lock nuts (13), at washers
(12) and hex head cap screws (11) that were supplied
with the MJX housing sub-assembly (1). The lock nuts
(13) and hex head cap screws (11) must be tightened to
a torque of 22..25 ft-lbs (30..34 Nm).
Operation
WARNING:
THE JACKSCREW IS NOT TO BE USED AS AN ADJUSTABLE OPEN
STOP. THE JACKSCREW HANDWHEEL MUST BE FULLY RETRACTED
DURING NORMAL OPERATION.
1. The jackscrew is operated by turning the handwheel
clockwise. Depending on the jackscrew model, it can
take between 17 and 35 turns to achieve full rotation.
See the MJX Exploded View for details.
2. Stop turning the handle once the desired valve position
is achieved.
3. When the cause of the malfunction is solved, turn the
handwheel back to the actuator failsafe position. The
actuator can now control the valve.
Maintenance
1. All units are shipped fully greased and require only
periodic inspection and greasing. If needed, use grease
tting (14) to add Molykote type grease until the grease
cavity is full.
2. The MJX housing sub-assembly should not be fully
disassembled. Some parts can be replaced if damaged,
such as thrust bearing (7), pressure pad (4), hex head
cap screw (8) and o-ring (6).
18
17
2
10 14
15
111
12
12
13
19
5
6
7
3
4
9
8
B
A
16
Jackscrew manual override
Figure 6.
Jackscrew specification
Model For actuator series
Max. input torque* Number of turns
to fully compress
spring
Approximate dimensions
N-m ft-lb A B
mm in mm in
MJX-1 QPX-1 11 8 17 358.9 14.13 200 7.87
MJX-2 QPX-2 22 16 18 409.4 16.12 300 11.81
MJX-3 QPX-3 49 36 21 457.5 18.01 400 15.75
MJX-4 QPX-4 56 41 25 532.4 20.96 500 19.69
MJX-5 QPX-5 89 66 35 603.8 23.77 600 23.62
*Based on typical valve with 80-psi (5.5) bar actuator spring.
Manual Jackscrew Override (MJX)
MJX Exploded View
# DESCRIPTION
1 MJX HOUSING
2 ACME SCREW
3 O-RING CARRIER
4 PRESSURE PAD
5 O-RING
6 O-RING
7 THRUST BEARING
8 HEX HEAD CAP SCREW
9 FLAT WASHER
10 ACME HEX JAM NUT
# DESCRIPTION
11 HEX HEAD CAP SCREW
12 FLAT WASHER
13 LOCK NUT
14 GREASE FITTING
15 CAUTION LABEL
16 ATTENTION LABEL
17 HANDWHEEL
18 ROLL PIN
19 ROLL PIN

IMO 10/19
IMO-215 EN 9
4.5 Manual Override Gearbox (SRO)
The SRO is intended to move the valve upon failure of
the actuator, supply air, or electrical system. NOTE: The
following instructions reference a fail closed (clockwise to
close) installation, but a fail open installation is also possible.
The SRO can only be mounted to a QPX_/M male drive.
Installation
1. It is recommended to mount the handwheel on the
input shaft prior to assembling the gearbox to the valve.
2. Verify that the anges on the gearbox and valve align.
Also verify that the valve stem and the bore of the
gearbox driveshaft match.
3. Make sure the valve is in the fully closed position.
4. Make sure that the gearbox is in the fully closed position
(as standard from the factory). This is achieved by
turning the handwheel clockwise.
5. Screw the stud bolts into the bottom ange of the gearbox
prior to mounting the gearbox on top of the valve.
6. NOTE: use of a gasket/sealant on the anges between
the valve/ gearbox and between the gearbox/actuator
is recommended.
7. Insert the drive shaft of the valve into the bottom side
onto the gearbox.
8. Ensure the driveshaft can make a free quarter turn
clockwise (seen from the bottom side) from its end
position. The gearbox can then open the valve in case
of actuator or supply air failure.
9. Mount the gearbox perpendicular to the valve and
secure the fasteners.
10. Mount the actuator on top of the gearbox.
Figure 7.
Stop screw adjustment
1. Remove the air from the actuator and ensure the valve/
actuator/gear are in the fully closed position.
2. With the actuator and gear mounted, backout both
stop screws on the gear by 3-4 turns.
3. Using the actuator to cycle the valve, set the actuator
stops for both open and close (see section 2 of this IMO
for instructions).
4. Open Stop: Turn the gear handwheel counter clockwise
until it stops. Turn-in the gear open stop screw (Figure 8)
until it stops and then tighten the lock nut.
5. Close Stop: Turn the gear handwheel clockwise until it
stops. Turn-in the gear close stop screw (Figure 8) until
it stops and then tighten the lock nut.
6. For a fail open actuator, revere the above procedure.
Figure 8.
Operation
1. Vent the supply air from the pneumatic actuator.
2. The gearbox is operated by turning the handwheel.
Depending on the gearbox model, it can take between
8 and 13 turns to achieve full rotation.
3. The gearbox is self-braking so simply stop turning the
handle once the desired valve position is achieved.
4. When the cause of the malfunction is solved, turn the
handwheel back to the actuator failsafe position. The
actuator can now control the valve.
STOPSCREWCLOSED STOPSCREWOPEN
NUT

IMO 10/19
10 IMO-215 EN
4.6 Fusible Plug (LK-3116)
The fusible plug melts during a re or excessive
environmental temperature when the temperature reaches
an approximate level of 165°F. This releases the air from the
diaphragm case and rotates the valve to its fail-safe position.
NOTE: If needed, LK-3192 has a higher melting point of 212°F.
Installation
1. Using thread sealant, attach the fusible plug (3) and
pipe nipple (1) into the street tee as shown in Figure 9.
2. Insert this assembly into the plug guard (4) and secure
using the screw (5), lock washer (6), and hex nut (7).
3. Using thread sealant, attach the completed fusible plug
assembly to the 3/8" NPT port on the QPX diaphragm
casing. The tubing from the solenoid or positioner will
attach to the other end of the pipe nipple.
Fusible plug Exploded View
A
A
5
6
7
SECTION
A-A
1
2
3
4
Figure 9.
5. REPAIR KITS/SPARE PARTS
SERVICE KITS
Model Complete Diaphragm
QPX1 RKQ-68 RKQ-75
QPX2 RKQ-70 RKQ-76
QPX3 RKQ-71 RKQ-77
QPX4 RKQ-72 RKQ-78
QPX5 RKQ-73 RKQ-79
For further information on spare parts and service or
assistance visit our web-site at www.metso.com/valves.
ITEM PART NAME QTY
1PIPE NIPPLE 1
2STREET TEE 1
3FUSIBLE PLUG 1
4PLUG GUARD 1
5FIL. HD SCREW 1
6LOCKWASHER 1
7HEX NUT 1

IMO 10/19
IMO-215 EN 11
WARNING:
As the use of the actuator is application specic, a number of factors should be taken into account when selecting a valve
for a given application. Therefore, some of the situations in which the valves are used are outside the scope of this manual.
If you have any questions concerning the use, application or compatibility of the valve with the intended service, contact
Metso for more information.
HOW TO ORDER
PNEUMATIC, SPRING-DIAPHRAGM ACTUATOR, Series QPX
1. 2. 3. /4. 5. 6.
QPX 1 C M AS C
1. sign 2. sign 3. sign
/
4. sign 5. sign 6. sign
Actuator
Series Size Spring
Option
Keyed Female
Drive
Male Square
Drive Options Model
version
QPX
1 C K15
(15 mm)
M
(Male Square)
- No sign, standard version
AS 100% Adjustable stop
MJX Manual Jackscrew Override
SO Fail Open
F 1” NPT Air Inlet
(2. sign “3-5” only)
C
(Model C)
2
A
BK20
(20 mm)
C
D
3
A
K35
(35 mm)
B
C
D
4
B
K40
(40 mm)
C
D
5
B
C
D
3. sign Spring Option Details
A1.3 bar / 20 psi
B2.8 bar / 40 psi
C4.1 bar / 60 psi (standard)
D5.5 bar / 80 psi
ACCESSORIES
Field Mountable Accessories QPX Size
12345
100% Adjustable Stop Kit Code AS-1 AS-3 AS-4 AS-5
P/N MA0234139 MA0234140 MA0234141 MA0234142
Mechanical Lockout Kit Code LD-60 LD-61 LD-62 LD-63
P/N MA0026407 MA0026408 MA0026409 MA0026410
Manual Jackscrew Override Kit Code MJX-1 MJX-2 MJX-3 MJX-4 MJX-5
P/N MA0026451 MA0026452 MA0026453 MA0026454 MA0026455
Manual Override Gearbox
(QPX_/M only)
Code SRO-1 SRO-2 SRO-3 SRO-4 SRO-5
P/N MA0043214 MA0043215 MA0043216 MA0043217 MA0043218
Fusible Plug Code LK-3116
P/N MA0044535

Subject to change without prior notice.
Metso Flow Control Inc.
Europe, Vanha Porvoontie 229, P. O. Box 304, FI-01301 Vantaa, Finland. Tel. +358 20 483 150. Fax +358 20 483 151
North America, 44 Bowditch Drive, P. O. Box 8044, Shrewsbury, M A 01545, USA. Tel. +1 508 852 0200. Fax +1 508 852 8172
South America, Av. Independéncia, 2500-Iporanga, 18087-101, Sorocaba-São Paulo, Brazil. Tel. +55 15 2102 9700. Fax +55 15 2102 9748
Asia Pacic, 238B Thomson Road, #17-01 Novena Square Tower B, Singapore 307685. Tel. +65 6511 1011. Fax +65 6250 0830
China, 11/F, China Youth Plaza, No.19 North Rd of East 3rd Ring Rd, Chaoyang District, Beijing 100020, China. Tel. +86 10 6566 6600. Fax +86 10 6566 2583
Middle East, Roundabout 8, Unit AB-07, P. O. Box 17175, Jebel Ali Freezone, Dubai, United Arab Emirates. Tel. +971 4 883 6974. Fax +971 4 883 6836
www.metso.com/valves
12 IMO-215 EN
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5
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