Bardiani B935 User manual

USE AND MAINTENANCE MANUAL
B935 Double Seat Valves
GB-IST-B935-0413

(GB-IST-B935-0413) 2/24
The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
1. Safety/caution signs .........................................................................................................3
2. General safety precautions...............................................................................................3
3. Receiving/Unpacking/Storage ..........................................................................................4
4. Installation ........................................................................................................................5
5. Operation..........................................................................................................................7
6. Troubleshooting................................................................................................................8
7. Cleaning ...........................................................................................................................9
8. General maintenance .......................................................................................................10
9. Planned maintenance.......................................................................................................11
10. Planned maintenance.......................................................................................................12
11. Disassembly of valve type B935....................................................................................... 13
Drawing B935 ................................................................................................................... 16
Drawing B935 double body ..............................................................................................17
12. Assembly of valve type B935 ...........................................................................................18
13. Part list..............................................................................................................................22
Technical data...................................................................................................................23
Warranty ...........................................................................................................................24
Disclaimer...............................................................................................................................24
Index
Foreword
This instruction manual is an integral part of the valve delivery.
•To use the Atex valve model is obligatory to consult the appropriate manual.
• Always read it carefully before using the valve.
• Always keep it for future reference.
All rights are reserved. It is forbidden to reproduce or transit any part of the instruction manual by any means,
either electronic or mechanical, including photo copies, recording or any other memorisation or retrieval system
for purposes other than the exclusively personal use by the purchaser – without prior written permission by the
manufacturer.
This instruction manual is expressly intended for use by technicians. Therefore, some information which can easily
be inferred by reading the text and examining the illustrations and drawings has not been further specied. The
publisher is not responsible for any consequences of incorrect operations by the user.
The data and information in this instruction manual are subject to modications or updates without any further
notice or obligations on the part of the manufacturer.

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 3/24
2. General Safety Precautions
General WARNING sign, which indicates that special instructions MUST be followed
to avoid serious personal injuries.
General CAUTION sign, which indicates that special instructions MUST be
followed to avoid damage of equipment and environment
Indicates IMPORTANT information, which improves the understanding of the in-
structions.
ALWAYS read the technical data before installation, operation and maintenance.
ALWAYS use authorised personal to install, operate and service the valve. The personal should
know the valve and the instruction manual thoroughly.
ONLY use the valve for the designed purpose.
ALWAYS handle heavy valves carefully and use lifting tools where necessary.
ALWAYS pay attention to possible loose valve parts when unpacking the delivery.
ALWAYS connect air supply carefully and disconnect after use.
ALWAYS connect electrical supply carefully and disconnect after use.
NEVER touch moving valve parts.
NEVER touch a hot valve.
ALWAYS handle cleaning agents carefully.
NEVER remove a valve from piping or disassemble it when the valve or piping are pressurised.
We cannot be held responsible for incorrect
installation, operation and maintenance!
NOTE!
1. Safety/Caution Signs

A
B
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
CAUTION!
3. Receiving/Unpacking/Storage
- Opening
- Air connections
- Electrical connections
(for Giotto-Top®)
Packing
material
Satety valve
protection!
B935 B935
Double body
2. IDENTIFY VALVE TYPE SUPPLIED:
B935: Mixproof valve
B935 Double body: Double body mixproof valve
1. UNPACK AND CHECK VALVE DELIVERY:
A. Complete valve
B. Instruction manual
3. LIFTING OF HEAVY VALVE:
- Use lifting tool, if necessary.
- Fix valve to lifting tool.
4. HANDLING OF LOOSE VALVE PARTS:
- Avoid falling loose valve parts.
- Assemble and tighten loose parts.
5. PACKING MATERIAL:
- Inspect internal of valve.
- Remove material and dispose
of according to current directives.
6. INSPECTION/CLAIM:
- Inspect valve connections.
- Document /verify damage, missing
or wrong parts.
- Use current claim procedure if
necessary.
7.STORAGE/PROTECTION:
- Avoid dust,humidity,wetareas,he
at and similar.
- Avoid vibration.
- Min.: - 10 °C
- Max.: + 50 °C

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 5/24
Electrical Connections
Giotto - Top®
Electrical Connections
Giotto - Top®
Air
Air
Air
Air
Air
Support
Risk of
damage!
Valve
Mixproof
Valve
Mixproof
Divert
4. Installation
Air
Air
Air
Air
1. CONNECTION OF AIR AND ELECTRICITY SUPPLY:
- Use authorised personnel to install/connect the valve.
- Ensure correct air pressure and quality (see page 23).
- Ensure correct electrical supply for Giotto-Top®(see Giotto-Top®instruction manual).
2. DISCONNECT SUPPLIES AFTER USE:
- Disconnect air supply.
- Disconnect electrical supply (for Giotto-Top®).
3. MOVING VALVE PARTS:
- Never stick ngers into valve ports.
- Never touch the shaft of the valve whilst it is working
4. AVOID VALVE OVERLOADING AND COMPENSATE FOR:
- Vibration
- Thermal expansion
5. CORRECT FLOW DIRECTION:
- If possible, have ow against valve closing
direction to avoid or minimise water hammer.

A
A
(mm)
DN40
DN50
DN65
DN80
DN100
320
320
340
350
-
A
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
B935 (with Giotto-Top®)
Valve
Dimension
4. Installation
6. VALVE CONNECTIONS/UNIONS:
- Ensure tight connections between valve and
piping.
- Remember gaskets and t correctly.
- Tighten unions rmly and carefully.
7. WELDING VALVE BODY INTO PIPING:
- Remove inner valve parts.
- Weld body carefully into piping.
- Fit valve.
- See tting instructions.
8. INSTALLING VALVE INTO PIPING:
- Ensure sufcient clearance for valve disassembly.

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 7/24
1. SUPPLYING AIR AND ELECTRICITY TO THE VALVE:
- Use authorised personnel to operate the valve.
- Ensure correct air pressure and quality (see page 23).
- Ensure correct electrical supply for Giotto-Top®(see Giotto-Top®instruction manual).
2. DISCONNECT SUPPLIES AFTER USE:
- Disconnect air supply.
- Disconnect electrical supply for Giotto-Top®.
3. MOVING VALVE PARTS:
- Never stick ngers into valve ports.
- Never touch the shaft of the valve whilst it is working.
5. HOT VALVE/PIPING:
- Never touch hot valve or piping, if possible.
- Alternatively use protective gloves.
BURN RISK
Air
Air
Air
Air
Air
Air
5. Operation
Electrical Connections
Giotto - Top®
Electrical Connections
Giotto - Top®
Air
Air
Air
B935
doppio corpo
B935
4. USE THE VALVE EXCLUSIVELY FOR ITS INTENDED DESIGN USE.
B935: Mixproof valve
B935 Double body: Double body mixproof valve

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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
5. Operation
6. PRE-USE CHECK VALVE BEFORE OPERATION:
- Supply air to the valve.
- Supply electricity to the valve (with Giotto top®).
- Open and close the valve several times.
- Check that the valve functions operate correctly and smoothly.
2. REPLACING WORN VALVE PARTS:
- See page 12 for spare parts ordering.
1. TROUBLESHOOTING VALVE:
Always study operation and maintenance
instructions carefully before troubleshooting. Risk of external
or
internal corrosion
Electrical Connections
Giotto - Top®
Air
Air
Air
6. Troubleshooting
Risk of
seal
damage
External leakage
Internal leakage with closed valve,
caused by normal wear
External leakage
Internal leakage with closed valve
occuring earlier than normal wear
rate
Difculty opening and closing
Worn out seal
Excesive pressure
Excesive temperature
Aggressive uids
Too many controls active
Incorrect elastomer type of seal
Incorrectly positioning of the
actuator
Incorrect operation of actuator
Dirt in the actuator
Incorrect positioning of the valve
body
Replace with seals of a different
elostomer type
Modify operational conditions
Replace with seal of different
elastomer type
Fit the actuator correctly
Change from a normally open (NO)
to normally closed (NC) or
vice versa
Carry out actuator maintenance
Disassemble and reposition the
valve body
Replace seal
PROBLEM POSSIBLE CAUSE POSSIBLE REMEDY

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 9/24
7. Cleaning
1. CLEANING VALVE WITH CLEANING AGENTS:
- Use authorised personnel to clean the valve.
- Observe concentrations of cleaning agents.
- Follow instructions of cleaning agent suppliers.
- Always use protective goggles and gloves.
BURN RISK
2. HOT VALVE/PIPING:
- Never touch hot valve or piping, if possible.
- Alternatively use protective gloves.
3. HANDLING OF CLEANING AGENTS:
- Dose cleaning agents regularly to avoid excessive concentration.
- Always rinse carefully with clean water after cleaning.
- Check compatibility of valve matter.
Risk of
corrosion
stainless steel
Risk of
seal
damage
Example of suggested CIP
Step Temperature °C Cip product
First rinsing Atmosphere Water without chlorine or
chlorids
Washing 70° Soda (NaOH) at 1%
Intermediate washing Atmosphere Water without chlorine or
chlorids
Washing 70° Nitric acid (HNO3) at 0,5%
Final rinsing Atmosphere Water without chlorine or
chlorids
Recommended claning speed = 2 m/s

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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
8. General Maintenance
2. DISCONNECT SUPPLIES AFTER USE:
- Disconnect air supply.
- Disconnect electrical supply for Giotto-Top®
3. MOVING VALVE PARTS:
- Never stick ngers into valve ports.
- Never touch the shaft of the valve whilst it is working.
BURN RISK
Atmospheric
pressure
required!
4. PRESSURISED VALVE/PIPING:
Always release uid pressure from valve and
piping before disassembling the valve.
5. HOT VALVE/PIPING:
- Never touch hot valve or piping, if possible.
- Alternatively use protective gloves.
Air
Air
Air
Electrical Connections
Giotto - Top®
Air
Air
Air
1. SUPPLYING AIR AND ELECRICITY TO VALVE:
- Use authorised personnel to service the valve.
- Ensure correct air electrical supply for Giotto-Top®(see Giotto-Top®instruction manual).
- Ensure correct air pressure and quality (see page 23).
Electrical Connections
Giotto - Top®
Air
Air
Air

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 11/24
Wash and clean
thoroughly!
6. CLEANING OF DEPOSITS:
- Wash and clean all valve parts thoroughly before disassembly and assembly!
- Pay attention to possible deposits of cleaning agents and other aggressive uids!
- Always use protective goggles and gloves, if necessary.
9. Planned Maintenance
7. REPLACING WORN VALVE PARTS:
- Always use original spare parts.
- See page 12 for spare parts ordering.
- Dispose of worn parts according to current directives.
Planned maintenance Valve gaskets Actuator gaskets
Preventive Replace after 12 months Replace after 24 months
In case of leakage Replace at the end of the
day Replace in case of leakage
Periodical
Check for correct ope-
ration and absence of
leakage
Check for correct operation and
absence of leakage
Record all actions taken Record all actions taken
8. General Maintenance

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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
10. Spare Parts Ordering
NOTE!
Please copy this page, ll it out and fax it to below address.
À:
BARDIANI VALVOLES S.P.A. – Ufcio Ricambi
Fax: [phone]
From:
Valve type:
Valve type:
Shipping instructions:
Month/Year of purchase:
Quantity:
Description:
Position no.:
Quantity:
Description:
Position no.:
Quantity:
Description:
Position no.:
Quantity:
Description:
Position no.:

33
35
1
24
1
51
60
50
106
2
14
62
245
70
94
11
58
75
193
24
240
271
270
51
52
24
126 199
1
33
108
42
The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 13/24
11. Disassembly of B935
2. Remove air pressure from the central air connec-
tion (24) and remove lower body (1).
3. Supply air to the upper air connection (75).
Unscrew the lower shutter (51) sujetar the shaft
(11) with an allen wrench.
Air
Air
COUNTERHOLD
Air
1. Supply air to the central air connection (24).
Remove the clamp (33) from lower body (1)
and the assembly (35).
2. B935 double body. Remove air from the central air connec-
tion (24) and dismount the bodies (42 and 1). Remove from
this the clamp (199 and 33), dismount the plug (52) and the
bodies (1 and 42). Remove the seal rings (108 and 126).
4. Remove the seal ring
(94), from the lower
shutter (51).
5. Unloose the adjusting sleeve (58) using an hand spanner, and unscrew pin guide (245)
the drain outlet (270) and seal ring (271), then unscrew the upper shutter (2). Remove
the sealing ring disc (50), seal rings (60 and 70) and the bushing (106). Remove the
bushing (193) and the seal rings (14, 62 and 240) from the upper shutter (2).

A
101
85
18
A
13
66
77
12
11
9
18
31
13
66
18
85
11
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
11. Disassembly of B935
COUNTERHOLD
7. Gradually reduce the press force, matching the stop-
per (18) until the complete unloaded of the secondary
spring (85).
This operation must be carried out with great
care by a specialised person.
10. Using a press with a plug specially made for the operation (A) preload the upper piston (66). Unscrew the nut
(77) using a wrench specially made and mach the piston (66) until the complete unloaded of the spring (31).
This operation must be carried out with great care by a specialised person.
9. Sujetar with an allen wrench the shaft (11) and
unscrew the spring block.Also remove the seal
ring (12).
6. Using a press with a plug specially made for the
operation (A) preload the stopper (18). Unscrew
the socket screw (101) from the cylinder (9).
This operation must be carried out with
great care by a specialised person.
8. Remove the stopper (18), unthread the shaft (11)
together with piston block (66 and 13) and spring
(31). Also remove the secondary spring (85).

18
17
19
16
66
91
90
4
13
9
34
81
58
83
35
121
82
53
61
120
35
58
53
31
13
66
77
154
The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 15/24
13. Remove the seal rings (91 and 90) from the
upper piston (66).
12. Remove the seal rings (16 and 19) and the guide
bushing (17) from the stopper (18).
14. Remove the seal rings (4) from the central piston
(13).
15. Unscrew the socket screw (34), disassemble the
part assembly (35), the lower piston (53), the
adjusting sleeve (58) from the cylinder (9).
16. Remove the seal ring (83) from the adjusting sleeve
(58), seal rings (82 and 61) from the lower piston (53)
and seal rings (81 and 121), the guide bushing (120)
from the part assembly (35).
11. Unthread the upper piston (66), the spring (31),
the nut (77) and gauge (154) [only DN25--40, 65]
from the central piston (13).
11. Disassembly of B93511. Disassembly of B935

B935
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
11. Disassembly of B935

The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 17/24
11. Disassembly of B935
B935 double body

50
106
70
60
81
121
35
120
62
14
2
193
53
82
61
4
13 66
90
91
240
94
51
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
12. Assembly of B935
1. Heat up seal rings (14 and 62)* in water to approx
85°C to soften them, insert this seal rings in the
seat in the upper shutter (2), using a cylindrical
object to push this rings in the cross way. Also
insert the seal ring (240)* and the guide bushing
(193).
3. Insert the seal rings (60 and 70)* and the guide
bushing (106) in the sealing ring disc (50).
5. Insert the seal rings (61 and 82)
in the lower piston (53).
2. Insert the seal ring (94)* into the lower shutter
(51).
*Lubricate elastomers with a product suitable for food contact
4. Insert the seal rings (81 and 121) and the guide
bushing (120) in the assembly (35).
6. Insert the seal ring (4) in the
central piston (13).
7. Insert the seal ring (90 and 91) in
the upper piston (66).

18
17
19
16
58
83
35
53
58 9
34
35
58
53
A
31
66
77
31
13
66
154
77
The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice. (GB-IST-B935-0413) 19/24
12. Assembly of B935
10. Insert the lower piston (53), the adjusting
sleeve (58) into the part assembling (35).
11. Fit the part assembling (35), the lower piston (53)
and the adjusting sleeve (58) in the cylinder (9)
using the socket screw (34). Orient the part as-
sembling so that the tab with BARDIANI symbol
was aligned with the air connections.
8. Insert the seal rings (16 and 19) and the guide
bushing (17) in the stopper (18).
9. Insert the seal rings (83) in the adjusting
sleeve (58).
12. Prepare the spring block putting gauge (154)
[only DN25--40, 65], the spring (31) and the
upper piston (66) and the nut (77) on the
central piston (13).
13. Using a press with a plug specially made for the operation
(A) preload the upper piston (66). Screw the nut (77)
using a wrench specially made and mach the piston (66)
until the complete unloaded of the spring (31).
This operation must be carried out with great
care by a specialised person.

12
11
A
101
50
2
58
9
35
31
13
66
18
85
11
18
245
35
2
58
271
270
9
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The Company BARDIANI VALVOLE reserves the right to modify its products at any time without prior notice.
12. Assembly of B935
COUNTERHOLD
15. Insert the secondary spring (85) in to the
cylinder (9), introduce the shaft (11) comple-
te of the piston (66 and 13) and the spring
(31) in to the cylinder (9). Closed it with the
stopper (18).
14. Insert the seal ring (12) on the shaft (11). sujetar
with an allen wrench the shaft (11) and screw
the spring block on it.
16. Using a press with a plug specially made for the ope-
ration (A) preload the stopper (18). Screw the socket
screw (101) in the cylinder (9).
This operation must be carried out with great
care by a specialised person.
17. Introduce the sealing ring disc (50) in to the part
assembling (35) and screw the upper shutter (2)
in the adjustin sleeve (58).
18. Screw pin guide (245)* through the slotted hole on the assembling part (35) on the upper shutter (2), Insert seal
ring (271)* and screw the drain outlet (270). Screw the adjusting sleeve (58) using an hand spanner.
*Lubricate elastomers with a product suitable for food contact