BA46E032
Operating Instructions
ERHARD ERU Knife Gate Valve K1
DN 50 - 600
With FESTO COPAC Actuator
These operating instructions must always be used in combination with operating
instructions BA01E001!
1 Safety
Access to the moving range of the gate of ERU Knife Gate Valves with piston actuator
has to be restricted by means of protective devices. Effective protective devices have
to be installed by the user.
On request, we will supply suitable protective guards.
1 Safety
2 Description of Product and Range of Application
3 Design Features – Technical Data
4 Performance and Mode of Operation
5 Storage
6 Installation into the Pipeline - Mounting
7 Initial Operation
8 Operation
9 Maintenance
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 1 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
2 Description of Product and Range of Application
Type/Design DN Product Number
ERU Knife Gate Valve K1 50-350 4657.... PN10
ERU Knife Gate Valve K1
ERU Knife Gate Valve K1 400-600 4607.... PN4
ERU Knife Gate Valve K1
Product No.
4657, 4623
4607, 4608
Nominal
size
DN
50 - 350
400-600
Nominal
pressure
If EPDM profile seals are used for the ERU Knife Gate Valves K1, the parts of EPDM
must not get in contact with oil or grease, as the EPDM would swell.
For a recommended lubricant see section "Maintenance".
ERU Knife Gate Valves K1 of this design are suitable for "ON-OFF" operation.
For explicit regulating service, special designs have to be used, e.g. design with
regulating orifice.
with regulating orifice 50-350 4623.... PN10
with regulating orifice 400-600 4608.... PN4
PN
10
4
Hydr. test pressure in bars
Body Seat max. 70° C
15
6
for
Max. admissible
working pressure in
bars at a working
temperature of
10
4
10
4
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 2 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
3 Design Features – Technical Data
Drawing 3E 63404
ERU Knife Gate Valve K1 with FESTO COPAC Actuator
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 3 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Dimensioned table (for drawing 3E 63404
)
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 4 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
4 Performance and Mode of Operation
ERU Knife Gate Valves K1 are wafer-type single-door gate valves with short face-toface dimension. A special type of these valves, e.g. with regulating orifice, is also
suitable for regulating purposes. The solid gate slides in a long gate guide between
two body components. It seals on its periphery against a rubber-resilient, steelreinforced, enclosed U-shaped sealing element. Where the gate leaves the body,
tightness to the outside is ensured by a resiliently prestressed profile seal which can
be readjusted. For reducing wear and tear of the profile seal and the actuating
elements the prestress can be reduced to the dimension required for the actual
operating pressure.
The Gate Valves were tested for tightness and resistance to DIN EN 12266 and DIN
EN 1074 at the manufacturer's plant. They are designed for flow acting from any
direction.
The pressurized piston moves the gate in OPEN-CLOSED direction by means of the
piston rod.
The limit positions are limited by piston stops in the cylinder. The piston actuator is
suitable for the supply medium: filtered and oiled compressed air or filtered and
compressed air without oil.
Note: if oiled air is used, the actuator must continue to be supplied with oiled air, too
(the original lubricant is flushed out by the oil).
Operating Limits of Standard Design
ERU Knife Gate Valve K1 DN50-600 PN10/4
Required supply pressures for piston actuators
DN 50 65 80 100 125 150 200 250 300 350 400 500 600
Cyl. 80 80 100 100 125 100 125 125 160 160 250 160 250 160 250 250 250 250 320
Diameter
Working-
Pressures
Bars
4 3 3 4 3,5 3 3,5 3 4 2 4 2 6 3 5 3 3 5 5 5
6.0 3 3 4 5 4 5 4 5 3 5 3 7 4 6 4 4
10.0 4 4 5 5 5 5 5 5 5 8 5 8 5 8 5 5
Minimum supply pressures
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 5 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Air consumption at 6 bars supply pressure (theoretical values) in [Nl]
DN 50 65 80 100 100 125 125 150 150 200
Cyl.
Diameter
Opening 1,65 2,15 4,24 5,3 8 6,65 10 12,9 20,3 27
Closing 1,75 2,275 4,4 5,5 8,6 6,625 10,75 12 21,15 28,2
DN 200 250 250 300 300 350 400 500 600
Cyl.
Diameter
Opening 67 33,8 83,8 40,5 100,5 117,3 134 167,5 332,4
Closing 68,8 35,3 86 42,3 103,2 120,4 137,6 172 337,8
80 80 100 100 125 100 125 125 160 160
250 160 250 160 250 250 250 250 320
5 Storage
Store ERU Knife Gate Valves K1 in their closed position. Rubber-coated components,
as e.g. the sealing element between the body parts, have to be protected against
direct solar radiation. Avoid the effects of radiant heat, e.g. from heaters.
6 Installation into the Pipeline - Mounting
Remove all packing material from the valve. Prior to installation, check the pipeline for
impurities and foreign bodies and clean it if necessary.
+ There must be free access all around the valve for operation and
maintenance.
In case of flow media containing solid matters as e.g. sand etc. and installation into
horizontal pipelines the stem or the piston rod should not be installed with an
inclination of more than 30º towards the horizontal. Thus, free flushing of the travel
range of the gate is possible.
In case of deviating installation positions, especially with suspended stem or piston
rod, deposits around the gate have to be expected. This could lead to mal-functions
which increase maintenance work.
During installation of the valve, the distance between the pipe flanges should exceed
the valve face-to-face dimension by at least 20 mm. Thus, the raised faces will not be
damaged and the gaskets can be inserted. Steel-reinforced rubber seals to DIN 2690
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 6 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
are recommended for use as flange gaskets, for slip-on flanges they are absolutely
necessary (consider resistance to flow medium and temperature).
The mating pipe flanges must be plain-parallel and concentric.
Tighten the connecting bolts evenly (without distortion) and crosswise. The pipeline
mustn't by any means be pulled up to the valve.
If the distance between the flanges is too large for the valve, use thicker gaskets to
cover the difference.
ERU Knife Gate Valves K1 are
- clamped between two flanges of the pipeline (wafer type) or
- screwed to the end flange of the pipeline as end-of-line valves.
The screwed connection with the pipeline is made from flange to flange by means of
bolts in the through-going holes. For the threaded blind holes the screwed connection
is made by means of stud bolts or bolts in the body components.
It is possible to roughly fasten the valve by means of the threaded holes.
The necessary connecting elements for the corresponding installation position are
shown in drawing No. (4E127 920).
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 7 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Connecting elements for flange connection (to drawing 4E127920)
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 8 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
7 Initial Operation
After installation, the valve has to be checked for smooth operation.
It has to be moved at the operating element over the whole travel (OPEN-CLOSED).
In case of lower working pressures, after having carried out the pressure test of the
pipeline, the profile seal can be released to be adapted to the effective working
pressure. For this purpose, the bolts on the cover plate have to be loosened in an
appropriate manner. By means of this measure you can reduce wear and tear of the
components involved in the motion.
ATTENTION! The flow medium may penetrate. Wear safety clothing (safety
goggles) in case of toxic or caustic media.
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 9 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
8 Operation
Trouble Possible Causes Remedy
Leakage at the
cover plate
Wearing of the profile seal Replace profile seal
Contamination
Seat leakage Contamination of the gate With valve in open position:
Defective U-shaped sealing
Excessive operating
forces
Stem running dry Regrease thread
Operation blocked Residues of flow medium are
Foreign bodies jammed in the
Prestress too low Readjustment of cover plate
see paragraph “9 Maintenance“
With valve in open position:
(deposit on the gate)
element
Contamination (deposit) on the
gate
hardened
seating zone
clean and grease gate
clean and grease gate
Replace sealing element
With valve in open position:
clean and grease gate
Relieve pipe section from pressure.
Clean and grease all accessible surfaces
of gate and stem. Slacken cover plate.
Slightly unscrew upper body bolts. Knock
on the valve with a rubber mallet trying to
operate the valve. If you are not
successful: remove, dismantle, clean,
replace damaged parts.
Move valve in OPEN position and repeat
closing procedure
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 10 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
9 Maintenance
For inspection or repair, the valve – or parts thereof - must not be removed unless the
pipe section in which the valve is installed has been isolated and made pressureless. If
work is carried out in the vicinity of the valves, which leads to soiling (concrete work,
masonry, painting, sandblasting and the like), the valves must be covered effectively.
ERU Knife Gate Valves K1 have to be moved regularly at short intervals (every half
year) over the whole travel (OPEN-CLOSED). Depending on the flow medium and
the local conditions at the site of application, the maintenance interval must be
reduced or may be extended. If the profile seal is found to be untight, retighten the
hexagon bolts of the cover plate evenly. If it is no longer possible to retighten the cover
plate, replace the sealing elements.
Check gate and stem regularly for contaminations, clean them if necessary and treat
them with lubricant (rub in a thin layer).
Recommended lubricant: KLÜBERSYNTH VR69-252
company Klüber Lubrication, Munich
Spare parts and wearing parts according to: drawing 4E139741
4E139742
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 11 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Drawing 4E139741
ERU Knife Gate Valve K1 with FESTO COPAC Cylinder
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 12 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Parts lists and set of spare parts (for drawing 4E139741)
1. Replace U-shaped sealing element Set1 every 5 years
2. Replace Fork nut Set2 as required
Item Description Set1 Set2
1 Body component
2 Sealing element X
3 Hexagon bolt
4 Washer
5 Hexagon nut
6 Gate
7 Profile seal X
8 Guide tape X
9 Compressor
10 Threaded pin X
11 Cover plate
12 Washer
13 Hexagon bolt
14 Stud bolt
15 Gudgeon
16 Bearing support
17 Washer
18 Hexagon nut
19 Cylindrical bolt
20 Fork nut X
21 Bush X
22 Bolt X
23 Washer X
24 Cotter pin X
25 Taper plug
26 Washer
27
FESTO Copac linear
actuator
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 13 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Drawing 4E139742
ERU Knife Gate Valve K1 with FESTO COPAC Cylinder
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 14 of 15
Operating Instructions for ERU Knife Gate Valve K1 with FESTO COPAC Actuator
Parts lists and sets of spare parts (for drawing 4E139742)
1. Replace U-shaped sealing element Set1 every 5 years
2. Replace fork nut Set2 as required
Item Description Set1 Set2
1 Body component
2 Sealing element X
3 Straight pin
4 Compressor
5 Packing cord square X
6 Proflile rubber X
7 Gate
8 Washer
9 Hexagon bolt
10 Hexagon nut
11 Hexagon bolt
12 Hexagon nut
13 Washer
14 Threaded sealing ring
15 Yoke
16 Bush X
17 Cylindrical bolt
18 Washer
19 Fork nut X
20 Threaded pin X
21 Bolt X
22 Locking washer X
23 Intermediate flange
24 Washer
25 Cylindrical bolt
26
FESTO Copac Linear
actuator
BA46E032
August 2003
Rev. 5
ERHARD-Armaturen x D-89502 Heidenheim x Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info@erhard.de
Internet: http://www.erhard.de
Page 15 of 15
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