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1849050/3
IM-P184-09
CMGT Issue 4
Spirax SafeBloc
DBB3 Double Block and Bleed
TM
Bellows Sealed Stop Valve
Installation and Maintenance Instructions
1. Safety information
2. General product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
© Copyright 2018
1
IM-P184-09 CMGT Issue 4
Printed in GB
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Table of Contents
Related Manuals for Spirax Sarco SafeBloc DBB3
Summary of Contents for Spirax Sarco SafeBloc DBB3
- Page 1 1849050/3 IM-P184-09 CMGT Issue 4 Spirax SafeBloc DBB3 Double Block and Bleed Bellows Sealed Stop Valve Installation and Maintenance Instructions 1. Safety information 2. General product information 3. Installation 4. Commissioning 5. Operation 6. Maintenance 7. Spare parts © Copyright 2018 IM-P184-09 CMGT Issue 4 Printed in GB...
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Page 2: Safety Information
Determine the correct installation situation and direction of fluid flow. Spirax Sarco products are not intended to withstand external stresses that may be induced by any system to which they are fitted. It is the responsibility of the installer to consider these stresses and take adequate precautions to minimise them. -
Page 3: Protective Clothing
1.9 Tools and consumables Before starting work ensure that you have suitable tools and/or consumables available. Use only genuine Spirax Sarco replacement parts. 1.10 Protective clothing Consider whether you and/or others in the vicinity require any protective clothing to protect against the hazards of, for example, chemicals, high/low temperature, radiation, noise, falling objects, and dangers to eyes and face. -
Page 4: Residual Hazards
Customers and stockists are reminded that under EC Health, Safety and Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk. -
Page 5: General Product Information
2. General product information Fig. 1 2.1 Description The Spirax SafeBloc is a double block and bleed bellows sealed stop valve, which has been designed for use as an in-line double isolation valve on steam, gas, liquid, condensate and water systems. Available types DBB3 steel body and bonnet with PN40 and ANSI 300 connections. -
Page 6: Pressure/Temperature Limits
400 °C @ 24 bar g (752 °F @ 348 psi g) Minimum operating temperature -10 °C (14 °F) (Note: For lower operating temperatures consult Spirax Sarco) Designed for a maximum cold hydraulic test pressure of: 60 bar g (870 psi g) ANSI 300... -
Page 7: Installation
3. Installation Note: Before actioning any installation observe the ‘Safety information’ in Section 1. Referring to the Installation and Maintenance Instructions, name-plate and Technical Information Sheet, check that the product is suitable for the intended installation: Check materials, pressure and temperature and their maximum values. -
Page 8: Operation
This action prevents any force being applied to open a valve, which is already fully open, resulting in damage to the stem, bellows unit or other components. Spirax Sarco bellows sealed isolation valves are fitted with a position indicator, which can be found on the stem, and should align with the (+) or (-) on the bonnet support pillars. - Page 9 When handwheels A and B are closed and drain port C is opened there will be an initial discharge as the valve depressurises. If there should be any visible discharge after a short period, consult Spirax Sarco Service Department. Note: Handwheels should always be opened slowly to avoid system shocks.
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Page 10: Maintenance
6. Maintenance Note: Before actioning any maintenance programme observe the ‘Safety information’ in Section 1. Warning The body/bonnet gaskets (11a and 11b) contain a thin stainless steel support ring which may cause physical injury if not handled and disposed of carefully. 6.1 General information Before undertaking any maintenance on the valve, ensure any pressure is isolated and safely vented to atmospheric pressure. - Page 11 Step 3 Depressurise the valve body and establish isolation integrity Step 4 Depressurise the downstream system Step 5 It is now safe to maintain the downstream system Return to Step 1 Please note: The Spirax SafeBloc is shown with the bellows sealed bleed valve option. Other bleed arrangements are available on request.
- Page 12 The handwheel (7) is not supplied as a spare part. However, to remove the handwheel unscrew the main handwheel nut in a clockwise direction. Place a suitable spanner (a detailed drawing is available from Spirax Sarco) across the flats of the bonnet bush (2) and unscrew the handwheel in the normal way.
- Page 13 Main handwheel nut Bonnet bush Locking screw Gland nut Gland washer Position indicator (clip-on) Bellows support collar Fig. 4 IM-P184-09 CMGT Issue 4...
- Page 14 6.6 How to fit the stem and bellows assembly By following through Section 6.5 it is now possible to fit a new stem/bellows assembly (6, 5): Fitting this is opposite to removal - remembering to fit a bellows collar gasket (11a) between the bellows support collar and valve bonnet (2).
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Page 15: Final Assembly
6.8 Final assembly: Main handwheel nut Ensure the bellows support collar and gaskets (11a and 11b) are accurately aligned with the bonnet (2) before final assembly into the body (1). Tighten the bonnet bolts/nuts (9 and 10) evenly to the recommended tightening torque (See Table 1). -
Page 16: Spare Parts
7. Spare parts The spare parts available are shown in solid outline. Parts drawn in a grey line are not supplied as spares. Available spares Body/bonnet gasket and stem packing 8 (2 off), 11a, 11b Stem and bellows assembly 6, 5 Disc Note: The gasket contains sharp metal reinforcement, please handle with care.