RELIEF VALVES. Type VS- FL. Process Management TM

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1 RELIEF VLVES Type VS- FL Process Management TM

2 Relief Valves This series of axial flow relief valves was designed to meet a wide range of applications. Large appreciation from worldwide customers is a guarantee of the reliability and versatility of this product. The main features are as follows: Counterbalanced shutter Full strength diaphragm Low number of parts Modularity design Reduced dimensions Easy Installation vailable Versions VS-FL-BP : For low and mid pressure applications. Pilot PRX/18. VS-FL : For mid and high pressure applications. Pilot PRX/18 or PRX-P/18. lso available version with type SR, SRII silencers.

3 Operation Pilot PRX/18 Pilot PRX/18 Shutter Chamber Shutter Chamber B L B L Jet Jet Diaphragm unit Diaphragm unit Chamber 1 Chamber 1 Relief valve spring Relief valve spring Closed VS-FL Relief Valve Opened VS-FL Relief Valve The diaphragm unit (permanently connected to the shutter) divides the relief valve actuator into two chambers. The chamber 1 is connected to the atmospheric pressure, chamber is connected to the pilot. In normal working conditions the two chambers are not containing pressure and the relief valve spring acts on the diaphragm unit and closes the shutter. If the line pressure exceeds the pilot set point, the pilot allows the gas to flow from the line to chamber. The shutter moves to its open position when the force produced by gas pressure acting on the diaphragm unit becomes greater than the load of the relief valve spring. Once the excess gas is released and line pressure returns to normal working conditions, the pilot stops the pressure flow, Chamber is no longer being fed, it is emptied through the jet. The diaphragm unit is pushed upward by the relief valve spring and the shutter moves to its closed position. 3

4 Features pplications VS-FL relief valves are used in reduction, distribution and conveying stations of suitably filtered natural gas. This product has been designed to be used with fuel gases of 1st and nd family according to EN 437, and with other non aggressive and non fuel gases. For any other gases, other than natural gas, please contact your local sales agent. Technical Features Flange rating PN 16 - NSI 150 llowable pressure PN 16 PS : 16 bar NSI 150 PS : 0 bar Set range VS-FL-BP PN 16 NSI 150 DN W d : 0.5 to 8 bar VS-FL-BP PN 16 DN W d : 0.5 to 16 bar VS-FL-BP NSI 150 DN W d : 0.5 to 19.3 bar Flange rating NSI 300/600 llowable pressure NSI 300 PS : 50 bar NSI 600 PS : 100 bar Set range VS-FL NSI 300 all sizes W d : 1 to 50 bar VS-FL NSI 600 all sizes W d : 1 to 80 bar Functional Features Flanged connections Identical Inlet and outlet : DN * - 50* (*) DN 00 and DN 50 BP versions are not available Temperature Standard version Working -10 C +60 C Low temperature version Working -0 C +60 C Materials Flanges and covers Carbon steel Diaphragms Fabric NBR+PVC/Nitrile rubber Pads NBR Nitrile rubber (FKM available on request) 4

5 Calculation Procedures Symbols Q = Natural gas flow rate in Stm 3 /h = bsolute inlet pressure in bar P = bsolute outlet pressure in bar C g = Flow rate coefficient C1 = Body shape factor d = Relative density of the gas Flow Coefficients DN VS-FL-BP VS-FL-BP-SR VS-FL VS-FL-SR VS-FL-SRII C g C1 3,1 33,4 3,1 33,4 33,5 C g C C g C1 3,6 33,7 3,6 33,7 33,4 C g C C g C1 3,1 33 3, ,0 C g C1 3,1 3,7 3,1 3,7 3,9 C g C1 7,6 9,8 7,6 9,8 31,7 C g C ,6-3,3 C g C ,3-35,5 Flow Rate Q Sub-critical state with: P > Q = 0.55 C g sine 3417 C1 -P N.B. the sine argument is expressed in sexagesimal degree Critical state with: Q = 0.55 C g P For other gases with different densities, the flow rate calculated with the above formulas must be multiplied by the correction factor: F= 0.6 d Gas Relative Density d Factor F ir Butane Propane Nitrogen

6 DN Sizes Calculate the required C g with the following formula: Sub-critical with: P > C g = 0.55 sine Q 3417 C1 - P N.B. The sine argument is expressed in sexagesimal degree Critical state with: C g = Q 0.55 P N.B. The above formulas apply to natural gas flow rate only. If the flow rate value (Q) refers to other gasses, divide it by the correction factor F. Select the diameter of the relief valve with C g higher than calculated value. fter finding the DN of the relief valve, check that gas speed on the seat does not exceed 10 m/sec, using the following formula: V = Q DN Pu 1 + Pu V = Velocity (m/s) = Numerical constant Q = Flow rate under standard conditions (Stm 3 /h) DN = Regulator nominal diameter (mm) Pu = Inlet pressure in relative value (bar) Pilots VS-FL relief valves are equipped with the PRX/ series pilots. Model llowable Pressure PS (bar) Set Range W d (bar) Body and Covers Material PRX/ PRX-P/ Steel N.B.: 1/4 NPT female threaded connections 6

7 I VS-FL Relief Valves Examples of Connections To the atmosphere or in a safe area PRX/18 Jet (0,75 mm) B L Plug VS/FL To the atmosphere or in a safe area Overall Dimensions (mm) and Weights (kg) Dimensions Weights DN Face to Face - I PN 16 - NSI 150 NSI NSI 600 PN 16 - NSI 150 NSI NSI 600 PN 16 - NSI 150 NSI NSI 600 VS-FL-BP VS-FL VS-FL-BP VS-FL VS-FL-BP VS-FL Note: For DN 00 NSI 300 face to face is 568 mm, for DN 50 NSI 300 face to face is 708 mm. 7

8 Industrial Regulators Natural Gas Technologies LP-Gas Equipment TESCOM Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Regulator Technologies, Inc. Emerson Process Management Tescom Corporation US - Headquarters McKinney, Texas US Tel: Outside US: US - Headquarters McKinney, Texas US Tel: Outside US: US - Headquarters McKinney, Texas US Tel: Outside US: US - Headquarters Elk River, Minnesota US Tel: Europe Bologna 40013, Italy Tel: sia-pacific Shanghai 0106, China Tel: Middle East and frica Dubai, United rab Emirates Tel: Europe Bologna 40013, Italy Tel: Chartres 8008, France Tel: sia-pacific Singapore 18461, Singapore Tel: Middle East and frica Dubai, United rab Emirates Tel: Europe Selmsdorf 393, Germany Tel: sia-pacific Shanghai 0106, China Tel: For further information visit Our Global Product Brands: TM TM The Emerson logo is a trademark and service mark of Emerson Electric Co. ll other marks are the property of their prospective owners. Fisher, Tartarini, Francel, Emerson Process Management and the Emerson Process Management design are marks of the Emerson Process Management group of companies. The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice. Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Emerson Process Management product remains solely with the purchaser. O.M.T. Officina Meccanica Tartarini S.R.L., Via P. Fabbri 1, I Castel Maggiore (Bologna), Italy R.E BO Cod. Fisc Part. IV N IV CEE IT , Cap. Soc Euro i.v. R.I M BO Francel SS, 3 venue Victor Hugo, CS 8015, Chartres 8008, France SIRET PE 651B, N TV : FR , RCS Chartres B , SS capital Euro D104061XIT- 0/015 - Rev.00 Emerson Process Management Regulator Technologies, Inc., 015; ll Rights Reserved Process Management TM

RELIEF VALVES. V Series. Process Management TM. Type V/20-2. Type V/50. Type V/60

RELIEF VALVES. V Series. Process Management TM. Type V/20-2. Type V/50. Type V/60 RELIEF VALVES V Series Type V/2-2 Type V/5 Type V/6 Process Management TM V/5 and V/6 Series Spring-Loaded Relief Valves The spring-loaded relief valves are designed to keep line pressure below preset