Pneumatic Shut-off Butterfly Valve Type 3335/BR 31a

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1 Pneumatic Shut-off Butterfly Valve Type 3335/BR 31a Application Tight-closing butterfly valve for process engineering and plants with industrial requirements DN 50 to DN to 12 Nominal pressure PN 10 and PN 16 Max. operating pressure 10 or 16 bar Temperatures 10 to +150 o C 14 to +302 o F Type 3335/BR 31a On-off Butterfly Valve with Type 3335 Butterfly Valve and single-acting Type SRP Pneumatic Rotary Actuator Valve body material Cast iron or Spheroidal graphite iron Seat ring EPDM or PTFE Butterfly disc material Spheroidal graphite iron or Cast stainless steel PFA lined Attachment of control valve accessories, such as pneumatic or electropneumatic positioners, electrical or pneumatic limit switches or solenoid valves according to VDI/VDE Throttling service The Type 3335 Butterfly Control Valve can also be used for continuous control applications in the rotation range from 25 to 60. Fig. 1 Type 3335/BR 31a Pneumatic Butterfly Valve Versions Standard version DN 50 to DN 300 Type 3335/BR 31a (Fig. 1) Tight-closing Type 3335 Butterfly Valve with single-acting Type SRP Pneumatic Rotary Actuator Further versions with Double-acting Type DAP Rotary Actuator Larger nominal sizes available on request Emergency manual override for Pfeiffer Type BR 31a-SRP and Type BR 31a-DAP Rotary Actuators Single-acting Type 3278 Rotary Actuator (Fig. 2) Special materials Fig. 2 Type 3335/3278 Pneumatic Butterfly Valve Information Sheet for actuators Information Sheet for rotary valves T 8300 EN T 8200 EN Edition February 2004 Data Sheet

2 Principle of operation The process medium flows through the butterfly valve. The flow coefficient is determined by the opening angle of the disc (4), i.e. the cross-sectional area between the disc and the body (2). The disc is connected to the actuator by means of the shaft and coupling elements. The disc and the seat ring (3) come into contact with the process medium. The seat ring also functions as a flange seal. Fail-safe position Depending on how the rotary actuator is attached, the butterfly valve has two different fail-safe positions which become effective when the pressure acting on the diaphragm is reduced or when supply air fails: Valve CLOSED without supply air, the butterfly valve is closed when the supply air fails. Valve OPEN without supply air, the butterfly valve is opened when the supply air fails Fig. 3 Type 3335 Pneumatic Butterfly Valve Version with EPDM seat ring Fig. 4 Type 3335 Pneumatic Butterfly Valve Version with PTFE seat ring Legend 1 Bearing bushing with O-ring 6 Belleville spring washer 2 Body 8 Elastomer 3 Seat ring 9 Adapter 4 Disc with shaft 10 Mounting block 5 Packing follower 2

3 Table 1 Technical data DN 25 to to 12 1) Nominal pressure PN Valve body style Wafer type Lug type on request Overall length EN Series 20 (DIN 3202 K1) Mountable between flanges PN 10, PN 16 or Class 150 Temperature range Seat ring EPDM 10 to 120 C (14 to 248 F) PTFE 10 to 150 C (14 to 302 F) Permissible operating pressures Seat ring 2) EPDM 16 bar (10 bar with cast iron body) PTFE 10 bar Leakage class acc. to EN Test P12 - Leakage rate "A" 1) Larger nominal sizes available on request 2) Special version for vacuum service Table 2 Materials Valve body Cast iron EN-JL1040 Spheroidal graphite iron EN-JS1049 Seat ring EPDM PTFE Elastomer Silicone Disc Up to DN 150: DN 200 and higher: EN-JS1049 CrNiMo steel CrNiMo steel PFA lined Shaft Up to DN 150: DN 200 and larger: CrNiMo steel CrNiMo steel Packing follower Bearing bushing with O-ring POM/FPM (FKM) Belleville spring washer Spring steel Shaft seal (O-ring) FPM (FKM) Table 3 K v values Opening angle mm in

4 Differential pressure tables for Type 3335 Butterfly Valve for on-off applications Pressures in bar Table 4a Permissible differential pressures for fail-safe position "Valve CLOSED" Springs Required signal Differential Max. perm. supply pressure with shaft Shaft Type SRP Actuator mm in n= pressure 1) pressure 2) St / / / / / / / / / / / ) Required signal pressure to open the disc 2) Disc in closed position; the differential pressure is restricted due to the valve version (see Table 1). Table 4b Permissible differential pressures for fail-safe position "Valve OPEN" Springs Required signal Differential Max. perm. supply pressure with shaft Shaft Type SRP Actuator mm in n= pressure 1) pressure 2) St / / / / / / / / ) 2) Required signal pressure to close the disc Disc in closed position; the differential pressure is restricted due to the valve version (see Table 1). A differential pressure of at least 10 bar is necessary when a PTFE seat ring is used. 4

5 Table 5 Shaft, seating and unseating torques in Nm Perm. shaft torque (up to 20 C; 68 F) with material Seating and unseating torque at a differential pressure of mm in St bar 1) 10 bar 16 bar ) When a PTFE seat ring is used, the higher torque in column "10 bar" applies for a differential pressure of 5 bar. Table 6 Dimensions and weights for Type 3335/BR 31a Butterfly Valve Valve DN 50/2 65/ /3 100/4 125/5 150/6 200/8 250/10 300/12 Length L mm Shaft d mm B mm A mm Flange DIN 3337 F07 F07/F10 F07/F10 F07/F10 F10/F12 F10/F12 F12/F14 F14/F16 F14/F16 SW mm 17 17/22 17/22 17/22 22/27 22/27 27/36 36/46 36/46 C mm /80 60/80 80/90 90/120 90/120 Weight app. kg Type SRP Rotary Actuator H3 mm E mm Connecting flange DIN 3337 F07 F07 F10 F10 F12 F12 F14 F14 F16 F16 SW mm Weight Type SRP kg

6 E Ordering text DN... PN... Materials according to Table 2 for Body Butterfly disc Seat ring H3 A C Actuator Supply pressure Fail-safe position Pfeiffer Type BR 31a or Type bar Valve CLOSED or Valve OPEN Fig. 4 Dimension diagram for Type 3335/BR 31a Pneumatic Butterfly Valve L B Max. differential pressure Temperature of process medium Vacuum service Control valve accessories p 0 in bar (closed position) C or K no/ yes (... mbar abs) Specifications subject to change without notice. SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße Frankfurt am Main Germany Phone: Fax: Internet:

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