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Operating Instructions for Butterfly Valves DN 700 - DN 1200 (PN 10/16/25)
- Publication date:30 October 2025
- Contract type:Unlimited employment
- Place of work:Jona
Job summary
Discover high-quality butterfly valves for various applications. Ideal for fluid control in diverse environments.
Tasks
- Utilize valves for potable water, air, and gases as per standards.
- Ensure minimal pressure loss with easy-to-replace butterfly seals.
- Maintain valves without the need for regular upkeep or maintenance.
Skills
- Experience in valve installation and operation preferred.
- Familiarity with pressure classes PN 10, PN 16, PN 25.
- Ability to perform pressure tests and valve adjustments.
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About the job
Operating instructions for butterfly valvesDN 700 - DN 1200 (PN 10/16/25)
PIPEVALVES +
1. Scope of application
Butterfly valves can be used for drinking or raw water, compressed air and all types of gases, in accordance with the DVGW G 260/1 technical data sheet. Other fluids on request. Pressure classes PN 10, PN 16, PN 25; the nominal pressure corresponds to the operating pressure and the maximum pressure difference. Flanges according to DIN standards 28604, 28605, 28606. Flanges according to ASA and BSI standards on request. Temperature range for the aforementioned fluids: +70°C.
2. Characteristics
Double eccentric butterfly valve, with minimal pressure loss. Easily replaceable butterfly seal. Shaft with plain bearings, requiring no maintenance. Shaft sealing ensured by means of O-rings inside and outside. Indicator device on the housing cover (OPEN-CLOSED). Crank lever gearbox with adjustable stop for the CLOSED position. Operation by means of a ball handle handwheel.
Classification of gearboxes by butterfly valves, tab. 1:
DN
700
800
900
1000
1200
PN 10
SK IV
SK IV with gearbox
GS 250
PN 16
SK IV with gearbox
GS 200
GS 250
PN 25 SK IV with gearbox
GS 200
GS 250
Maximum permissible input torque of gearboxes, tab. 2:
Turns per stroke, tab. 3:
Gearbox
Max. input torque
Max. input torque
Gearbox
Turns/ permissible in Nm, position permissible in Nm, position stroke
"OPEN"
"CLOSED"
SK I
21
SK I
30
250
SK I A
21
SK I A
40
250
SK II A
24
SK II A
90
250
SK III
30
SK III
150
250
SK IV
43
SK IV
300
400
SK IV with V.
172
SK IV with V.
120
120
GS 200
212
GS 200
70
70
GS 250
208
GS 250
140
140
3. Storage notes
Butterfly valves must be stored in a way to be protected from dust and damage. The profiled seal must not be exposed directly to sunlight.
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4. Notes on assembly and valve body n Clean the butterfly, housing and profiled seal. n Check that the valve has not been damaged during storage or transport. n Perform a functional check. The operating torque must not exceed the values indicated in table 2. In case of doubt, measurements should be repeated using a torque wrench.
5. Maintenance n Butterfly valves require no maintenance. n The drives and bearings have good operating properties in case of emergency. n It is recommended to operate the butterfly valve once or twice a year.
6. Replacement of the profiled seal (see chap. 8; Butterfly valve spare parts list) n Put the butterfly shaft (pos. 3) in the open position. n Unscrew the hex head bolts (pos. 15) of the drive shaft and pull it out by at least 10 mm. n Turn the gearbox 90° counterclockwise. n Remove the clamping ring (pos. 4) after removing the countersunk screw (pos. 30). n Replace the profiled seal (pos. 9) and clean any impurities around it. n Ensure that the profiled seal is correctly placed in the retaining groove. n Screw the clamping ring (pos. 4) and slightly pre-tension the seal. n Return the gearbox (pos. 2) to the starting position and fix it; insert the splined cylindrical pin (pos. 17). n Put the butterfly shaft in the "CLOSED" position. n Perform a pressure test according to the corresponding class (see DIN 3230, part 3). n In case of leakage, tighten the countersunk screws (pos. 28) in the affected area. n Tighten the threaded studs (pos. 26) before completing the pressure test.
7. Set the gearbox end stop in the "CLOSED" position (see chap. 9) n Unscrew the locking screw (pos. 15). n Remove the spindle nut (pos. 6) from the threaded sleeve (pos. 13) by turning the handwheel towards "OPEN". n Remove the threaded stud (pos. 36). n By turning the threaded sleeve (pos. 13) clockwise, you will move the mechanical end stop so that when activating the handwheel clockwise, the washer will be pressed deeper into the seal seat. n Turning counterclockwise will have the opposite effect. However, you must ensure not to exceed the "X" range. Retighten the threaded stud (pos. 36) after adjusting the sleeve (pos. 13). n Screw the locking screw (pos. 15) back in.
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8. Butterfly valve spare parts
Position
Designation
Materials
No M
1
Valve body
EN-GJS-400-15
ENJS1030
2
Gearbox type SK
3
Disc
EN-GJS-400-15
ENJS1030
4
Clamping ring
EN-GJS-400-15 // X6CrNiMoTi17-12-2
ENJS1030 //1.4571
5
Control shaft for SK
X20Cr13 // X6CrNiMoTi17-12-2
1.4021 //1.4571
6
Trunnion
X20Cr13 // X6CrNiMoTi17-12-2
1.4021 //1.45717
7
Secondary bearing A
GZ-CuSn7ZnPb
2.1090.03
8
Secondary bearing B
GZ-CuSn7ZnPb
2.1090.03
9
Profiled sealing joint
EPDM 356/03 // NBR SL 77/89 E1
10
Shaft cover AK
S235JRG2
1.0038
11
Nameplate AK
CuZn35Ni3Mn2AlPb
CW710R
12
Bearing fixing ring AK
S235JRG2
10 038
13 and 14
O-ring
NBR
15
Hexagon screw ISO 4017
A2/A4 - 70
16
Spring washer DIN 127
X5CrNi18-10
1.4301
17
Splined cylindrical pin ISO 8740
6.8
18
Hexagon screw ISO 4017
X5CrNi18-10
1.4301
19
Nickel-plated round head rivet ISO 8746
20
Threaded stud DIN 914
X5CrNi18-10
1.4301
21
Conical dowel DIN EN 22339
X14CrMoS17
1.4104
22
Key DIN 6885
C32D
23
O-Ring
NBR
24
Indicator needle
Al
25
Operating handwheel DIN 950
Al
26
Threaded stud DIN 913
A2
27
O-Ring
NBR
28
Countersunk screw ISO 10642
8.8
29
Safety washer
X5CrNi18-10
1.4301
30
Cylindrical screw
A2
31
Gearbox
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PIPE + VALVES
Gearbox
X max. in mm
SK III
22
SK IV with V.
40
9. Crank lever gearbox spare parts
Position
Designation
Materials
No M
1
SK body
EN-GJS-500-7
ENJS1050
2
SK cover
EN-GJS-500-7
ENJS1050
3 SK drive fork
EN-GJS-500-7
ENJS1050
4
Console
EN-GJS-500-7
ENJS1050
5
SK splice
S235JRG2
1.0038
6
SK spindle nut
CuZn35Ni3Mn2AlPb
CW710R
7 SK control spindle
X20Cr13
1.4021
8
SK collar shaft
X20Cr13
1.4021
9
SK secondary bearing G
Polyamide
The valves
10
SK secondary bearing D
Polyamide
1.0038 butterfly valves from Wild
11
SK guide bearing
CuZn35Ni3Mn2AlPb
CW710R connect with
12
Sleeve
GZ-CuSn7ZnPb
2.1090.03 all systems
13
SK threaded sleeve
C45
15
Closing screw DIN 7604
5.8
- for a
19
Axial cylindrical roller investment
20
Hexagon screw
A2 for a safe future
21
Hexagon screw ISO 4017
A2
1.4301
22
Washer ISO 7090
X14CrMoS17/X5CrNi18-10
1.4104
23
Threaded stud DIN 914
5.8
24 Splined cylindrical pin ISO 8740
6.8
25
Key DIN 6885
C32D
26-29
O-Ring
NBR
31
Protective ring
Neoprene
36
Threaded stud DIN 913
5.8
37
Spacer IV
POM
38
Sample material
Wild Armaturen AG - Industrie Buech 31 - 8645 Jona-Rapperswil - Tel: 055 224 04 04 - Fax: 055 224 04 44 - www.wildarmaturen.ch
