97 Valve Group Series 700 Farris Engineering Pressure Relief Valves
Numbering System Selecting and specifying Farris pressure relief valves is simple using the numbering system that follows. Each digit of the type number has a distinct significance. The digits describe the basic valve series, orifice, seat design, inlet temperature range, body, bonnet and spring material, inlet type and pressure rating. 7 D H M 0 /S4 4 Series Number Orifice rea 7 US ustomary Units Sq. In. 0.06 D 0.5 E 0. F 0.50 G 0.57 Metric mm 4.7 D 0.65 Seat onstruction 5 Inlet Size Outlet Size Variations T Metal Seat Soft Seat Teflon Seat /" /4" " 4 -/" " 4 -/" 5 " 6 " H High pressure variations of standard types alanced design D Heat transfer fluid standard pressure E Heat transfer fluid high pressure Inlet onnections M MNPT F FNPT Flanged-50RF Flanged-00RF Flanged-600RF 4 Flanged-900RF 5 Flanged-500RF 6 Flanged-500RF O ap onstruction Test Gag Materials Plain 4 Packed Lever 7 Open Lever 0 No Gag Test Gag S4 omplete 6 St. St. N NE Trim: Standard N4 NE Trim: ll St. St. M Monel ody & Disc M Monel Internals M4 omplete Monel H Hastelloy ody & Disc E.7 F 5. G 69.6 S Socket Weld T Sanitary W Welding Nipple H Hastelloy Internals H4 omplete Hastelloy Ordering Information Please specify the following so that we may process your order as quickly as possible.. Quantity.*. Inlet and outlet sizes.. Farris type number.* 4. Inlet and outlet connections: MNPT, FNPT, flanged, socket weld, sanitary inlet or welding nipple. 5. Materials of construction if other than standard. 6. O-ring seat pressure seal material, if required. 7. Set pressure.*. Operating and relieving temperatures.* 9. llowable overpressure.* 0. Fluid and fluid state.*. ackpressure, superimposed constant and/or variable, and built-up.*. Required capacity.*. ccessories: open or packed lever if required; test gag.. ode requirements, if any. *s a customer service, we verify your selection and sizing. In order to do this, we must have this information.. Not all combinations of inlet and outlet sizes shown are available. onsult the selection tables of pages 4 and 5.. Test gag option is not available with open lever cap.. vailable in O-ring seat design only. onsult the Farris Factory. 4. Duplex stainless steel available upon request, consult the factory. 5. Selection of proper soft good material is customer s responsibility.
700 Series onventional omplies with SME oiler & Pressure Vessel ode, Section VIII 9 7 5 0 ill of Materials onventional Item Part Name Standard Material ody S-5 Gr. FM St. St. or S-479 Type 6 St. St. onnet S-6 Gr. W, arb. St. Disc 6 St. St. 4 Guide 6 St. St. 5 Disc Holder 6 St. St. 6 Stem 6 St. St. 7 Spring dj. Screw 6 St. St. Jam Nut 6 St. St. 9 ap, Plain Screwed arbon Steel 0 ap Gasket 6 St. St. ody Gasket 6 St. St. Guide Gasket 6 St. St. Spring (-50 F to +750 F) Stainless Steel Spring uttons 6 St. St. 5 Wire Seal St. St. Wire / Lead Seal 6 Nameplate (Not Shown) Stainless Steel 7 Welding Nipple (Inlet) 6 St. St. Welding Nipple (Outlet) arbon Steel 9 Lap Joint Stub End (Inlet) 6 St. St. 0 Lap Joint Stub End (Outlet) arbon Steel Lap Joint Flange (Inlet) arbon Steel Lap Joint Flange (Outlet) arbon Steel O-Ring Retainer O-Ring Seat Seal 6 4 5 O-Ring Design Retainer Lockscrew 0 7 Welded End Design 9 Flanged Design
700 Series alanced Design omplies with SME oiler & Pressure Vessel ode, Section VIII 0 9 7 onnet Vent 7 6 9 5 4 6 5 K b (Gas) K w (Liquid) ack Pressure orrection Factor Do you have variable back pressure? an t use a balanced bellows design? Farris has the solution with the Series 700 alanced Design pressure relief valve. The balanced effect is achieved by isolating the upper valve chamber and eliminating any back pressure build-up in the bonnet affecting valve set pressure. These valves are available in /", /4" and " inlet sizes with a " outlet and two orifice areas. Pressure ranges from 5 to 0 psig, standard soft seat design. Flanged and welded inlet and outlet connections are available with the same material options as the standard design. ill of Materials alanced Design Item Part Name Standard Material ody S-5 Gr. FM St. St. or S-479 Type 6 St. St. onnet S-6 Gr. W, arb. St. O-ring Retainer 6 St. St. 4 O-ring Seat Seal Viton 5 Retainer Lock Screw 04 St. St. 6 Guide 6 St. St. 7 Guide Seal Viton Disc Holder 6 St. St. 9 Disc Holder Seal Viton 0 Stem 6 St. St. Spring dj. Screw 6 St. St. Jam Nut 6 St. St. ap, Plain Screwed arbon Steel ap Gasket 6 St. St. 5 ody Gasket 6 St. St. 6 Guide Gasket 6 St. St. 7 Spring Stainless Steel Spring uttons 6 St. St. 9 Wire Seal St. St. Wire/Lead Seal 0 Nameplate (Not Shown) Stainless Steel Series 700 ack Pressure orrection Factor, alanced Design. 0. 0.6 0.4 0. 0. Other O-ring materials available. onsult the factory. 0%. Flanged, socket weld, welding nipple and female inlet threaded designs available.. Temperature for balanced or O-ring seat design is limited by the elastomer selected. See page 4. Viton is a registered trademark of DuPont Elastomers. 5% 0% 5% 0% 5% 0% 5% 40% % 50% 55% 60% 65% 70% 75% 0% Percent ack Pressure
Dimensions & Weights (MNPT, FNPT, & SW) G (MNPT) (FLNGED) (WELDING NIPPLE) Threaded onnections (MNPT x FNPT) Valve Size US ustomary Units (Inches) Metric Units (millimeters) pprox. Weight Inlet x Outlet and D Orifice / x /4 x /4 x H.P. x x H.P. E Orifice (Max.) ll ap onst. -/4 -/4-5/ -/ -5/ -9/6-9/6 (Max.) ll ap onst. 6 9 lb kg x -/ -5/ -/ 9 6 7. F Orifice -/ x -9/6-7/ 70 76 9 7 7.7 G Orifice -/ x -9/6 4-/ 70 76 05. 9 9 Socket Weld & FNPT x FNPT onnections Valve Size US ustomary Units (Inches) Metric Units (millimeters) pprox. Weight Inlet x Outlet (Max.) ll ap onst. (Max.) ll ap onst. lb kg and D Orifice / x / x H.P /4 x /4 x H.P. x x H.P. -7/6-5/ -7/6-5/ -7/6-5/ -/6 -/6 -/6 9 9 9 E Orifice x -/ -/ -/ 40 9 6 7. F Orifice -/ x -9/6-7/ 70 76 9 7 7.7 G Orifice -/ x -9/6 4-/ 70 76 05. 5. H.P. designates the high pressure version of a given inlet size.. Same pipe thread connections also used on socket weld models with corresponding inlet sizes.. Tolerance for and dimensions is ±/".