Samson 3351 Mounting And Operating Instructions
Pneumatic on/off valve/version with handwheel
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- Mounting and operating instructions (16 pages) ,
- Mounting and operating instructions (88 pages)
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Summary of Contents for Samson 3351
- Page 1 Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve Type 3351 Pneumatic On/off Valve Version with handwheel Mounting and Operating Instructions EB 8039 EN Edition May 2016...
- Page 2 Definition of signal words DANGER! NOTICE Hazardous situations which, if not Property damage message or mal- avoided, will result in death or seri- function ous injury Note: WARNING! Additional information Hazardous situations which, if not avoided, could result in death or seri- Tip: ous injury Recommended action...
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Page 3: Table Of Contents
Contents General safety instructions ................4 Process medium and scope of application ............5 Transportation and storage ................5 Design and principle of operation ..............6 Installation ....................8 Mounting position ..................8 Control pressure line ..................8 Accessories ....................8 Start-up ......................9 Maintenance ....................10 7.1 Disassembly (DN 15 to 80) ................10 Assembly (DN 15 to 80) ................ -
Page 4: General Safety Instructions
General safety instructions 1 General safety instructions − The device must be mounted, started up, or serviced by fully trained and qualified personnel only; the accepted industry codes and practices are to be observed. Make sure employees or third persons are not exposed to any danger. − All safety instructions and warnings given in these mounting and operating instructions, particularly those concerning installation, start-up and mainte- nance, must be strictly observed. -
Page 5: Process Medium And Scope Of Application
Directive 2014/34/EU. For connection to the equipo- tential bonding system, observe the requirements specified in section 6.4 of EN 60079-14 (VDE 0165 Part 1). 2 Process medium and scope of application Type 3351 On/off Valve with tight shutoff for liquids, gases and vapors according to DIN or ANSI standards. Valve size DN 15 to 100 NPS ½... -
Page 6: Design And Principle Of Operation
Depending on the design of the valve seat to 40 or Class 150 and 300, fail-close or (2) and where the plug (3) is located inside fail-open the valve, the valve has two different fail-safe Type 3351 · On/off valve with self-adjusting actions which become effective when the PTFE V-ring packing in nominal size DN 15 pressure is relieved from the diaphragm to 100 (NPS ½ to 4) for medium tempera- (5.4) or the supply of control pressure fails. - Page 7 Design and principle of operation DN 100 version Fail-close Fail-open Fail-open R = 47 mm Fail-close R = 64 mm DN 15 to 80 version with handwheel DN 15 to 50 Version with bellows seal Detailed view: connection for control pressure with G ¼ female thread Fail-open Fail-close Fail-close Fig. 1: Functional diagram of Type 3351 Pneumatic On/off Valve EB 8039 EN...
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Page 8: Installation
For control applications with liquids, the me- (5.7). Connection with G ¼ female thread. dium must flow into the plug in the opening 5.3 Accessories direction (B A). In fail-open valves, all media must flow in SAMSON provides mounting kits with addi- the opening direction (A B). tional parts to attach valve accessories (e.g. Control pressure and max. differential pres- Type 3768 Limit Switch, Type 3730 Position- sure Δp er). Specify the item number listed in Table 1... -
Page 9: Start-Up
Start-up 6 Start-up First start up the valve after mounting all parts. As a general rule: open and close shut-off valves slowly. Open the shut-off valves first on the upstream pressure side (upstream of the valve). Afterwards, open all the valves on the consumer side (downstream of the valve). Table 1: Mounting accessories Mounting Item no. Item no. Valve size Description accessories for (individual parts) (assembly) Mounting accessories for 1400-6787 Type 3768... -
Page 10: Maintenance
Maintenance 7 Maintenance The procedures to disassemble the fail-close and fail-open valve are not the same as the See Fig. 1. plug is located differently in the valves. The on/off valve is subject to normal wear, A mounting device (see Fig. 2 and Table 2) especially at the seat and plug. Depending is needed as the spring (5.5) in the actuator on the operating conditions, check the valve is preloaded. - Page 11 Maintenance 4. Unthread the clamping bolts of the Insert the guide part of the seat wrench mounting device and the plug stem grad- into the body and unscrew seat with a ually until the plug stem is unscrewed out suitable tool extension. of the spring plate (5.6). Remove spring 7. Carefully clean all parts. Remove gasket plate and spring. Unscrew lock nut (3.2).
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Page 12: Assembly (Dn 15 To 80)
Maintenance 7.2 Assembly (DN 15 to 80) counterclockwise until it reaches the plug. Continue to gradually tension the mount- 1. In the fail-close version, place the plug in ing device until it rests on the diaphragm the body. In the fail-open version, push case with its three stop bushings in the plug into the valve bonnet. Carefully fail-close version or approx. 2 mm away degrease the thread of the plug stem. -
Page 13: Function Testing
Maintenance stem in the fail-close version. Observe (3.2) onto the plug stem until it reaches tightening torque according to Table 3. the thread end. Place on washer (3.3). Insert the guide part of the seat wrench 5. Screw nut and lock nut onto the plug into the body and unscrew seat with a stem according to the dimension R (see suitable tool extension. Fig. 1) and tighten. On doing so, make sure the plug rests on the seat. 6. - Page 14 Control pressure and max. differential pres- sure Δp Table 4 shows the correlation between con- trol pressure and max. differential pressure Δp based on the process medium used. The max. differential pressure depends on the control pressure and can be adapted to the operating conditions by SAMSON be- fore delivery. EB 8039 EN...
- Page 15 Maintenance Table 2: Special tools DN 15 to 25 DN 32 to 50 DN 65 and 80 DN 100 Valve size NPS ½ to 1 NPS 1½ to 2 NPS 2½ and 3 NPS 4 Tool Order no. Mounting device 1281-0036 1281-0037 1281-0038 – Seat wrench 1280-0006 1280-0013 1280-0008 1280-0009 Plug wrench...
- Page 16 Maintenance Table 4: Control pressure and max. differential pressure Δp Valve size ½ ¾ – 1½ 2½ Flow coefficient – Max. control pressure 6 bar/88 psi Standard version Fail-close Min. control pressure to open the 4 bar/58 psi valve at Δp Max. perm. Vapors, gases A B 20 bar/290 psi 16 bar/235 psi 10 bar/145 psi...
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Page 17: Nameplate
SAMSON After-sales Service department for support. 3351- The addresses of SAMSON AG, its subsid- iaries, representatives and service facilities worldwide can be found on the SAMSON website, in all SAMSON product catalogs or on the back of these Mounting and Operat- Type 3351 - Modification index ing Instructions. - Page 18 EB 8039 EN...
- Page 19 EB 8039 EN...
- Page 20 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 8039 EN samson@samson.de · www.samson.de...