Pre-Vent BR12b Instruction Manual

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BR12b Instruction Manual

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Summary of Contents for Pre-Vent BR12b

Page 1 BR12b Instruction Manual...
Page 2: Table Of Contents
10. Contacting us To ensure trouble-free and safe operation of the valve, it is essential to be familiar with the contents of this BR12b Instruction Manual, and also with the general instructions for installation and operation, before installing and operating the valve.
Page 3: Functional Principle
FUNCTIONAL PRINCIPLE The valve regulates mass-flow by a linear movement of the valve stem, which may be operated pneu- matically, electrically or manually. As the stroke of the valve alters, the openings in the cage can be re- leased or covered.
Page 4: Operability, Maintenance And Repair - Standard Construction
OPERABILITY, MAINTENANCE AND REPAIR - STANDARD CONSTRUCTION The operability of the regulator valve during use is based on maintaining an appropriate flow characteristic and not exceeding the permitted leakage level for the valve. To ensure long-term correct and safe operation of the valve, it is essential to carry out regular recorded inspec- tions.
Page 5: Valve Seat And Plug
4.2. Replacement of the valve seat and the valve plug If it is necessary to change the valve seat and valve stem due to a change in the operating conditions or due to wear and tear, proceed as follows: Before making the change, ensure that the valve is not under pressure and is not contaminated. Replacing the valve plug Loosen the upper part (bonnel) of the valve by opening the body nuts (21) between the body and the top of the valve.
Page 6: Operability, Maintenance And Repair
OPERABILITY, MAINTENANCE AND REPAIR – MODELS WITH EXTENDED OR BELLOWS CON- STRUCTION The regulator valve’s operability during use is based on maintaining an appropriate flow characteristic and not exceeding the permitted leakage level for the valve. To ensure long-term correct and safe operation of the valve, it is essential to carry out regular recorded inspec- tions.
Page 7: Valve Seat And Plug
5.2. Replacement of the valve seat and the valve plug If it is necessary to change the valve seat and valve plug due to a change in the operating conditions or due to wear and tear, proceed as follows: Before making the change, ensure that the valve is not under pressure and is not contaminated. In order to achieve a better seal when changing the valve seat and valve block, we recommend lapping the seat and the block with a fine abrasive paste.
Page 8: Model With Pneumatic P/R Actuator
PNEUMATIC P/R DRIVE (For drawing numbers, see BR11 manual) When the pressure rises in the actuator pressure chamber, a force is applied to the diaphragm in the actuator unit. If this force exceeds the spring force of the springs in the second chamber, the springs are compressed and the actuator stem starts to travel out or in, according to the function.
Page 9: Changing The Operating Mode Of The Actuator
6.1. Changing the operating mode of the drive No additional components are required in order to alter the direction of operation of type P/R pneumatic actua- tor. Changing P to R and vice versa Disconnect the valve from the actuator. Ensure that no air pressure is applied to the actuator.
Page 10: Replacing A Diaphragm
To change the drive function from R to P, proceed as follows: Remove the springs (31) from the diaphragm plate (28). Undo the special nuts (34) from the bolts on the actuator. Remove the diaphragm with its diaphragm plate, spacer ring, washer and spacer cover (or spacer co- vers for drive sizes 630 and 1000).
Page 11: Model With Pneumatic P1/R1 Actuator
PNEUMATIC TYPE P1/R1 DRIVE When the pressure rises in the actuator pressure chamber, a force is applied to the diaphragm in the actuator unit. If this force exceeds the spring force of the springs in the second chamber, the springs are compressed and the drive stem starts to travel out or in, according to the function.
Page 12: Changing The Operating Mode Of The Actuator
7.1. Changing the operating mode of the actuator No additional components are required in order to alter the direction of operation of type P1/R1 pneu- matic actuator. Disconnect the valve stem from the actuator stem. Remove the top cover of the actuator (44), taking care that the tension lock is loosened right to the end in accordance with the note on the warning label.
Page 13 To change the drive function from R1 to P1, proceed as follows: Remove the springs from the diaphragm plate. Loosen the thin nut (53) on the drive stem. Remove the diaphragm (55) with its diaphragm plate (45), spacer ring (47), washer (50) and cover (or spacer covers for drive sizes 630 and 1000) (48/49);...
Page 14: Other Actuators
It is possible to equip model BR12b valves with electrical actuator. Sizing the actuator to the regulator valve is normally a part of the bidding process. It is also possible to supply model BR12b valves with a purely manual operation (type NN), or to fit the pneumat- ic actuator with an additional hand-wheel (type P/R-N).
Page 15: Diagrams / Spare Part Lists
DRAWINGS / SPARE PARTS LIST Number and description of parts. Description Description Description Individual valve components Individual components of positioning drive O-ring 1a/1b Body Pressure sleeve (TA air) Z wiper ring Standard bonnet Leaf spring (TA air) O-ring Extension bonnet Pressure plate (TA air) Shaft connecting piece, Upper bellows bonnet...
Page 16 Lower bellow bonnet Stroke indicator Actuator yoke Spacer ring Guiding bush Drive wheel Bellow Braesing plug Drive sleeve Bellow sealing Guiding ring Drive cover Rivet pin 3x6 Drive shaft Securing washer Bolt Slot Bellow sealing Bolt Stroke plate Double-nut bolt Bolt Ball bearing Bolt...
Page 17 Figure 1: Regulator valve type Br12b with pneumatic drive type P1/R1 and side-mounted hand-wheel (cross- section)
Page 18 Figure 2: Different models of control valve type BR12b...
Page 19 Figure 3: Pneumatic positioning actuator with manual handwheel, type P/R-N...
Page 20: Contacting Us
PRE-VENT GmbH Sales - Production - Service Piracher Straße 74 84489 Burghausen, Germany Tel: +49 8677 98788-0 Fax: +49 8677 98788-80 Email: Web: www.pre-vent.com Manual Version 1.2 19.11.2019...