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Back Pressure Control Valve
Type 25P-BP, 25T-BP, 26P-BP and 26T-BP
Installation and Maintenance Instructions
Safe operation of these products can only be guaranteed if they are properly installed,
commissioned, used and maintained by qualified personnel (see Section 1.11) in compliance
with the operating instructions. General installation and safety instructions for pipeline and
plant construction, as well as the proper use of tools and safety equipment must also be
complied with.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended use / application.
i)
The products have been specifically designed for use on steam, air or water/condensate.
The products' use on other fluids may be possible but, if this is contemplated, Spirax
Sarco should be contacted to confirm the suitability of the product for the application
being considered.
ii) Check material suitability, pressure and temperature and their maximum and minimum
values. If the maximum operating limits of the product are lower than those of the
system in which it is being fitted, or if malfunction of the product could result in a
dangerous overpressure or overtemperature occurrence, ensure a safety device is
included in the system to prevent such over-limit situations.
iii) Determine the correct installation situation and direction of fluid flow.
iv) 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.
v)
Remove protection covers from all connections and protective film from all name-plates,
where appropriate, before installation on steam or other high temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded) before
attempting to work on the product. Arrange suitable lifting gear if required.
Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators
IM-P717-03-US Issue 1
Type 25BP and 26BP
Combination Regulators
1. Safety information
IM-P717-03-US
Issue 1
© Copyright 2023
1
Printed in US
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Summary of Contents for Spirax Sarco 25BP
- Page 1 Ensure safe access and if necessary a safe working platform (suitably guarded) before attempting to work on the product. Arrange suitable lifting gear if required. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators © Copyright 2023...
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Page 2: Protective Clothing
Post ‘warning notices’ if necessary. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1... -
Page 3: Returning Products
Cast Iron is a brittle material. If the product is dropped during installation and there is any risk of damage the product should not be used unless it Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1... - Page 4 Trap set Steam Trap set Trap set Condensate Condensate Condensate Steam Mains - Do's and Don'ts: Flow Flow Steam Steam Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 5 Flange bolts should be gradually tightened across diameters to ensure even load and alignment. Prevention of tensile stressing continued on next page Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 6 Limit movement rods Medium Fixing point distance Limit rods Small lateral movement Guides Guides Large lateral movement Large lateral movement Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
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Page 7: General Product Information
2. General product information The Type 25BP is a back pressure regulator for steam service. The control consists of a pilot with reverse-acting valve trim that positions a main valve in response to pressure fluctuations at the inlet. Normal operation of the main valve will depend on the application type: Type A. -
Page 8: Installation
Note: Installation of sensing line for Presssure Reducing Pilot is identical, except that it is connected to the down- stream steam line. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1... - Page 9 Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 10 After setting has been established, Valve A to low pressure main can be opened. Replace cover over pilot spring and tighten lock nut on adjustment stem to secure the setting. Valve is now in operation. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 11 Spira-tec loss detector Fig. 2 25 BP back pressure control as a surplussing valve venting excess flash steam to atmosphere. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 12 Turn adjustment screw on 25BP pilot counterclockwise to release all tension on the spring. This is to make sure that the 25BP pilot is fully open. Make certain spring remains in vertical position. a. Make certain valve #1 ahead of steam trap on steam supply line is open. This will ensure water- free steam at the regulator inlet when put into operation.
- Page 13 Fig. 3 25 BP Back Pressure control used to cut off steam to non-essential loads at times of boiler overload. Type 25BP and 26BP Back Pressure Control Valve / Type 25P-BP, 25T-BP, 26P-BP and 26T-BP Combination Regulators IM-P717-03-US Issue 1...
- Page 14 Remove back pressure pilot spring cover. Turn adjustment screw on back presssure pilot counterclockwise to release tension on spring. This is to make sure that the 25BP pilot is fully open. Make certain spring remains in vertical position. Remove ‘P’ pilot spring cover.
- Page 15 Turn adjustment screw on 25BP pilot counter- clockwise to release ten- sion on spring. This is to make sure that the 25BP pilot is fully open. Make certain spring remains in vertical position. Carefully uncoil the flexible tubing, avoiding sharp bends and kinks.
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Page 16: Maintenance
(by turning adjustment screw clockwise) until the 25BP valve begins to close. The inlet pressure will have to be throttled more as the 25BP valve closes and it is usually best to have an assistant control the valve inlet pressure.
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