Terranova MEC-RELA L20-A1 Series, Operative Manual

Page 1: ...instruments com a TERRANOVA Srl brand www terranova instruments com VAT IT07848810151 Factory Sales Via Gramsci 1 26827 Terranova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano I...

Page 2: ...6 Temperature 5 3 7 System 6 3 8 Pressurized Systems 6 3 9 Tools And Consumable Parts 6 3 10 Protection Clothes 6 3 11 Qualification Of The Operators In Charge Of The Works 6 3 12 Handling 7 3 13 Free...

Page 3: ...ova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano Italy Ph 39 0377 919119 Fax 39 0377 855720 Pag 3 24 6 6 Replacement Of The Seat Plug Of The Balanced Valve 17 6 7 Replacement O...

Page 4: ...to satisfy the needs of the industrial demand L20 valves are designed to control a broad variety of fluids like steam water most of the medium and gases One of the main features of this series is the...

Page 5: ...ended to withstand any external stresses which can be induced by the systems in which they are inserted The installer must take account of these stresses and take the appropriate measures to prevent t...

Page 6: ...block and vent and the blocking or the labelling of the closed valves Do not consider the system depressurized even if the pressure gauge indicates zero pressure The depressurization process should in...

Page 7: ...rotect the product in freezing environments where temperatures are lower than the freezing point of the process fluid 3 14 OTHER RISKS During the operation the external surface of the product can be a...

Page 8: ...pstream the valve will prevent dirt entering the valve To allow periodical maintenance of valves that are installed on continuously operating systems it is recommended to install two Isolating valves...

Page 9: ...lly tightened in criss cross sequence as indicated in Fig 2 MANDATORY Prevent any excessive tightening Use the recommended tightening torques Prevent any pipe misalignment Choose the flange gaskets ac...

Page 10: ...es 5 ACTUATOR CONNECTION 5 1 PNEUMATIC ACTUATOR CONNECTION The pneumatic actuator is provided with two 1 4 NPT connections one of which is closed by a filter Connect the control air pipe to the connec...

Page 11: ...eed always refer to the above mentioned number INFORMATION During operation the valve is pressurized Before performing any maintenance operation or action on any pressure retaining part make sure that...

Page 12: ...TERRANOVA Srl brand www terranova instruments com VAT IT07848810151 Factory Sales Via Gramsci 1 26827 Terranova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano Italy Ph 39 0377 9...

Page 13: ...EMENT OF ON OFF PISTON DISC ON OFF VALVE Separate the actuator from the valve see section 6 3 In reference to the Fig 9 for reverse action actuators and the Fig 10 for direct action actuators proceed...

Page 14: ...Pag 14 24 6 3 VALVE ACTUATOR SEPARATION By referring to Fig 11 for valves 1 2 4 or to Fig 12 for valves 6 8 perform the following steps Set the valve to the 50 stroke Fully unscrew the screws 1 and re...

Page 15: ...te the bonnet group 9 from the valve body 1 Remove the complete plug 3 from the bonnet 9 If required unscrew and replace the seat 2 by using the specific wrenches Insert in the bonnet 9 the new plug b...

Page 16: ...he bonnet group 9 from the valve body 1 Remove the complete plug 3 from the bonnet 9 Remove the seat blocking cage 13 If required remove and replace the seat 2 Insert in the bonnet 9 the new plug by p...

Page 17: ...3 and the balancing piston 8 of the valve body 1 Remove any cage 5 Replace the sealing gasket of the balancing piston 8 by unscrewing the nut 16 If required unscrew and replace the seat 2 by using th...

Page 18: ...lete plug 3 from the bonnet 9 Remove the pin 17 and remove the plug 3 If required unscrew the bellows block 19 and replace it by replacing also the gasket 18 If required unscrew and replace the seat 2...

Page 19: ...vious paragraphs Fully unscrew the screw 1 Remove the upper packing gland 2 Remove the spring 3 Remove the lower packing gland 4 Replace the O ring 5 if present Carefully clean the housing chamber and...

Page 20: ...ad Office Via Rosso Medardo 16 20159 Milano Italy Ph 39 0377 919119 Fax 39 0377 855720 Pag 20 24 7 TIGHTENING TORQUES VALVE DIAMETERS SEAT 1 Nm 10 BONNET NUTS 2 Nm 10 SCREWS 3 Nm 10 NUT 4 Nm 10 VD10 K...

Page 21: ...erranova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano Italy Ph 39 0377 919119 Fax 39 0377 855720 Pag 21 24 VALVE DIAMETERS NUTS 9 Nm 10 NUT 6 Nm 10 RING NUT 7 Nm 10 SCREWS 5 Nm...

Page 22: ...8810151 Factory Sales Via Gramsci 1 26827 Terranova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano Italy Ph 39 0377 919119 Fax 39 0377 855720 Pag 22 24 8 SIZES OF THE ACTUATOR CO...

Page 23: ...d or erosion as they may significantly damage the pressurized parts by locally reducing the thickness and as a consequence the safety degree 10 AVAILABLE SPARE PARTS DESCRIPTION FIGURE POSITION Screwe...

Page 24: ...instruments com a TERRANOVA Srl brand www terranova instruments com VAT IT07848810151 Factory Sales Via Gramsci 1 26827 Terranova dei Passerini LO Italy Head Office Via Rosso Medardo 16 20159 Milano I...