MANUFACTURING
Fundamental guidelines are thus applied to the latest generation of shut-off valves . The TA-Luft ( VDI 2440 ), which ensures the use of suitable gaskets for flange connections and valves , is one of the most important standards for volatile emissions . DIN EN ISO 15848-1 , which describes the tightness class and strength class , also makes a significant contribution to the measurement , testing and qualification procedures for fugitive emissions and goes hand in hand with the qualification procedure for the type testing of valves ( ISO 15848-1:2015 + Amd . 1:2017 ). Controlling fugitive emissions from fittings is no easy task . To fulfill the criteria , great care must be taken when designing and manufacturing the high-performance butterfly valve , especially the packing . The technical basis for the almost frictionless movement , resulting in low wear and thus a long service life , is provided by seat-contact-free travel , in which the disc moves without contacting the seat except for a few degrees of the setting angle . In detail , however , the packing must fulfill the requirement for sufficient sealing reliability , as well as acceptable torques . Bidirectional flow and sealing , which
Table 1 : Design Standards and Certifications
Design Standards
STD # Description
EN
Namur
12569 Valves for chemical and petrochemical industry 593 Industrial valves - metallic 558 Industrial valves - face to face 1092-1 Flange drillings 12516-1 Industrial valves - shell design strength 12266-1 / 2 Industrial valves - testing 16668 Testing of metallic valves NE 167 NE 14
Emerson Keystone™ K-LOK ® Series 38 stem sealing increase safety for field personnel
Chemical and petrochemical requirements
Connection of part-turn valve actuators to valves ISO 5211 Industrial valves - actuation attachments AD 2000 Pressure equipment and vessels BASF E-S-PI 400 Technical delivery conditions for valves
Certifications
STD # Description EN 15848-1 Fugitive emissions PED-CE UKCA SIL
Packing gland bridge
Packing gland
Stem packing
functions independently of the installation position and pipework pressure , and maintenance-friendly replacement of the packing and seat are standard , as are the latest European and global directives ( see Table 1 Design Standards and Certifications ).
Pressure Equipment directive UK Conformity Assessed Safety Integrity Level
BOR
Packing adjustment
Live loading
Advantages of high-performance butterfly valves
High-performance butterfly valves are versatile solutions for both on / off and control applications . Their compact design offers space and weight advantages compared to other valve types , such as ball and gate valves . Recent advancements in valve design , materials , and accessories have further enhanced their performance and reliability . When selecting valves for specific applications , it is crucial to evaluate all available options , considering factors such as valve design , materials of construction , and actuator compatibility .
Advancements in valve automation
High-performance butterfly valves offer versatile operation methods , including manual operation via hand lever or gearbox , as well as various actuator types such as pneumatic , electric , electrohydraulic , or those using pipeline gas as the motive power source . The industry is witnessing a steady decline in manually operated valves , with a shift towards automated solutions . Hydraulic actuators remain popular for applications requiring high torque , while medium-operated actuator variants are common in high-pressure pipelines . Consequently , many end-users are increasingly evaluating the choice between pneumatic and electric automation for their valve systems . In the chemical industry , pneumatic rack and pinion actuators are widely used due to the availability of instrument air . While most
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