Specifications Advanced triple eccentric

Designed for control and shut-off applications

Tightness class in accordance with IEC 534-4

                                                            Butterfly Valve Type VSS   BELL butterfl valve, type VSS is used as a control, on/off and shut-off valve. The VSS valve is designed to handle a wide range of liquids, gases and stem within a broad temperature range. The valve have an advanced triple eccentric design including a unique shape of the disc allows the use of a solid stainless steel seat. The solid seat remains un-affected by high flow velocities and temperatures. A good valve function is achieved even on difficult applications. The seat is replaceable in alternative materials. The VSS valve can be mounted between flanges and is also supplied in lugged design. The BELL valves are delivered ready for installation and operation. The valve assemblies are delivered factory tested as complete units with actuators, positioners and accessories.     BELL Butterfly Valve type VSS Advanced triple eccentric design Designed for control and shut-off applications Designed for applications up to 350°c (662°F) Has a tightness class in accordance with IEC 534-4 Class V as standard Has a solid seat made of stainless steel Designed to be mounted between flanges alt. with lugs   Option   PTFE-seat High temperature applications up to 550°c (1022°F)   Tightness clss     The tightness calss is related to the chosen materials in the seat ring. Metal seat    (Code C alt. D)     IEC 534-4 Class V PTFE-seat   (Code A)               IEC 534-4 Class VI (Option)    
                          Actuators and accessories   The valve can be fitted with BELL manual, on/off ir control actuators in accordance with the selection table. The valves will be delivered as tested units ready for installation. Other types of actuators and accessories can be fitted in accordance with your specifications.     Flange standard   BELL butterfly valve type VSS in this data sheet is of wafer type for mounting between flanges PN 10-25. The valve can also be delivered with "lugs". The valve can also be drilled for mounting between flanges according to ANSI, BS, etc. When ordering, please state the pressure rating of the counter flanges.     Seat design   The valve with a nominal size between DN 80 ~ DN 800 have a ,metal seat according to code C, while larger valves have a metal seat (type Y) according to code D. PTFE and HiNi seat is available as an option. Also check the valve specification system (code 6) to find further seat alternatives.     Supplemental information Gaskets   Note : Use gaskets with the correct inside diameter to ensure that pressure is applied on the cover plate. For mounting between flanges according to PN 10-25, the inside gasket diameter should not exceed the dimensions specified in the standard DIN-EN 1514-1.     Further technical information   Technical data for the materials used in the BELL valves, flange standard, steam data, etc.    For mounting between flanges according to ANSI 150 dimensions according to the standard ANSI B 16.21 RF are valid where the following dimensions refer to the gasket :         About Me