Cast iron liquid relief valves with bronze trim including models UL and FM approved for fire pump installations Model 8 Features Bolted bonnet allows easy inspection and servicing without removal from system. Quality cast iron body and bonnet. Insert and disc available in bronze or stainless steel and lapped for optimum performance. Springs are steel with plating for corrosion protection. High lift, wing-guided disc offers high relieving capacity. Pivot between disc and spring corrects misalignment and compensates for spring side thrust. ANSI B1.1 rated 0# inlet and 1# outlet flanged connections as standard. Optional epoxy-coated internal body and bonnet for corrosive environments (to 1 F ( C)). General application Liquid relief valves suitable for overpressure relief, pressure regulation and protection of pumps, tanks, lines and hydraulic systems. Models 18, 8 are UL 178 listed and FM approved for fire pump service. Technical data Connections: 1½ to FNPT 1½ to flanged Temperature range [1] : -0 to 0 F (-9 to 08 C) Pressure ranges [1] : Model 91: to 00 psig (0. to 7. barg) Models 18, 8: 0 to 00 psig (.1 to 1.8 barg) 1. For other pressure and temperature limits consult ANSI B1 cast iron flange standards. www.valves.emerson.com 017 Emerson. All rights reserved. VCTDS-0080-EN 1/0
Model overview Model 91: bronze trim with pressure-tight cap. Suitable for maximum back pressure of 0 psig (.1 barg) [1]. Model 18: bronze trim, UL and FM approved for fire pump installations. Special design offers minimum set pressure of 0 psig. Easily adjustable with handwheel to 00 psig (1.8 barg) (17 psig (1.1 barg) with optional 1# inlet flange). Model 8: bronze trim with pressure-tight cap. UL and FM approved for fire pump installations. Suitable for maximum back pressure of 0 psig (.1 barg) [1]. Supplied with handwheel. 1. Back pressure increases set pressure on a one to one basis and reduces capacity. Back pressure in excess of 10% of set pressure is not recommended. Parts and materials - Model 91 [, ] - Non-code, liquid relief valve No. Part name Materials 1 Body Iron, A1 class A or B O-ring NBR [9] Insert [1] Disc [1] Spring step [] Spring Steel, aluminum coated 7 Bonnet gasket Fiber and nitrile, klinger C-00 or C-01 8 Hex head cap screw [] Steel, SAE Gr. 9 Bonnet Iron, A1 class A or B 10 Cap gasket [] Fiber and nitrile, klinger C-00 or C-01 11 [7] Compression screw bushing Iron, A 80--0 1 Jam nut [] 1 Compression screw [] 1 Cap [] Iron, A1 class A or B 1 Socket set screw Steel, commercial 1 Stem [] 17 Stem end [8] Items not shown Handwheel [] Iron, A1 class A or B Handwheel jam nut [] Steel plated, commercial Model 91 1 1 1 11 10 9 8 7 1 1 17 s 1. Disc (item ) and insert (item ) material bronze, B-8 alloy 800 or B, also available in SS, A7 Gr. CF-8, as a package option.. Material CS with anti-corrosion coating, commercial Gr. or brass, B1.. bolts required for and sizes, and 8 bolts required for size.. Material brass, B1 or bronze, B8 casting.. Handwheel option available, delete cap (item 1) and gasket (item 10).. Flanges per ANSI B1.1. 0# inlet flange standard and 1# inlet flange optional. Outlet flange 1#. 7. Only used in orifices K through P. 8. Material SST or brass, B1. 9. For variation O-ring material is Viton. 1
Parts and materials - Models 18 and 8 - Non-code No. Part name Materials 1 Body [1] Iron, A1 class A or B O-ring NBR Model 18 1 1 Insert [] Disc [] Spring step [] Spring Steel, aluminum coated 7 Bonnet gasket Fiber and nitrile, klinger C-00 or C-01 1 11 10 1 8 Hex head cap screw [] Steel, SAE Gr. [] 9 Bonnet Iron, A1 class A or B 10 Compression screw bushing Brass, B1 11 Jam nut Brass, B1 1 Compression screw [] 1 Handwheel Iron, A1 class A or B 1 Handwheel locknut Steel plated, commercial Gr. 1 Spring pin Steel, commercial Gr. 1 Socket set screw Steel, commercial Gr. 9 8 7 17 1 18 17 Stem [] Compression screw locknut wrench [] Steel, A Installation instruction [] Paper, commercial Gr. 18 Stem end [] Model 8 only 18 Cap [7] Iron, A1 class A or B 19 Cap gasket [7] Gasket, klinger silicone C-00 s 1. Flanges per ANSI B1.1. 0# inlet flange standard and 1# inlet flange optional. Outlet flange 1#.. Disc (item ) and insert (item ) material bronze, B-8 alloy 800 or B, also available in SS, A7 Gr. CF-8, as a package option.. Material CS with anti-corrosion coating, commercial Gr., brass, B1 or SS, A8 TY 1.. bolts required for and sizes, and 8 bolts required for size.. Material brass, B1 or bronze, B8 casting (Model 18 only), B8 alloy 800 (Model 8 only).. Not shown on assembly. 7. Cap (item 18), gasket (item 19) and locknut (item 11) factory installed. Handwheel (item 1) shipped unassembled (Models 18 and 8). 1 Model 8 18 1 1 1 11 10 1 19 9 1 17 8 18 7 1
Specifications - Model 91 [1] Valve dimensions Min/max Approx. Model Valve size Connections ANSI standard (in) set pressure weight number (in) Inlet Outlet A B C (psig) (lb) 091A-G 1½ x 1½ FNPT FNPT ¾ ¼ 11⅞ /00 7 091H-G 1½ x 1½ 1# FL 1# FL ¾ ¼ 11¼ /17 091K-G 1½ x 1½ 0# FL 1# FL ¾ 11¼ /00 091A-H x FNPT FNPT ⅛ ⅛ 1¾ /00 091H-H x 1# FL 1# FL ¾ ⅝ 1¾ /17 7 091K-H x 0# FL 1# FL ⅝ 1¾ /00 7 091A-J ½ x ½ FNPT FNPT ½ ½ 1¼ /00 8 091H-J ½ x ½ 1# FL 1# FL ¼ ¾ 1¼ /17 091K-J ½ x ½ 0# FL 1# FL ¼ ¾ 1¼ /00 091A-K x FNPT FNPT ⅞ ⅞ 1 /00 81 091H-K x 1# FL 1# FL ⅞ ⅞ 1¾ /17 98 091K-K x 0# FL 1# FL ¼ ⅞ 1¾ /00 98 091A-M x FNPT FNPT ⅝ ½ /00 1 091H-M x 1# FL 1# FL ⅝ ½ /17 170 091K-M x 0# FL 1# FL ⅝ ½ /00 170 091H-P x 1# FL 1# FL 9⅜ 8½ 1 /17 0 091K-P x 0# FL 1# FL 9⅜ 8½ 1 /00 0 Specifications - Models 18 and 8 [1] Valve dimensions Min/max Approx. Model Valve size Connections ANSI standard (in) set pressure weight number (in) Inlet Outlet A B C (18) C (8) (psig) (lb) *8A-K [] x FNPT FNPT ⅛ ⅞ 0⅝ 1⅝ 0/00 8 *8H-K [] x 1# FL 1# FL ⅛ ⅞ 0⅝ 1⅝ 0/17 110 *8K-K [] x 0# FL 1# FL ⅛ ⅞ 0⅝ 1⅝ 0/00 110 *8A-M [] x FNPT FNPT ⅝ ½ 0/00 1 *8H-M [] x 1# FL 1# FL ⅝ ½ 0/17 18 *8K-M [] x 0# FL 1# FL ⅝ ½ 0/00 18 *8H-P [] x 1# FL 1# FL 9⅜ 8½ 0 1 0/17 0 *8K-P [] x 0# FL 1# FL 9⅜ 8½ 0 1 0/00 0 Dimensions are for reference only. FL Flange FNPT Female NPT s 1. Temperature limits -0 F to 0 F.. Replace asterisk with desired model number. Data applicable to Models 18, 8. Model 91 Models 18, 8 C C A A B B
Capacities - Non-code liquid - % accumulation (GPM) - Model 91 only Set pressure Inlet size (psig) 1½ ½ 1 87 1 7 10 79 1 177 1 0 111 17 0 7 89 0 77 1 1 07 8 109 0 88 17 1 0 99 17 7 9 707 11 0 108 19 01 77 19 70 117 08 8 87 17 80 1 8 01 89 1789 90 1 9 1 99 1897 100 10 9 89 0 1000 000 110 17 1 08 87 109 097 10 1 7 1 109 191 10 19 8 8 110 80 10 1 9 0 118 10 171 0 7 8 1 9 10 177 1 9 708 1 0 170 18 07 70 10 07 180 188 71 1 8 190 19 77 179 77 00 198 0 79 11 88 10 0 1 811 19 898 0 07 9 77 81 18 9 0 1 78 90 89 117 0 0 17 8 0 87 19 098 0 1 9 1 88 181 1 0 01 7 90 11 70 0 09 9 90 1 8 80 17 0 97 17 90 8 9 170 0 00 1 7 970 17 10 8 8 98 171 0 0 9 100 1789 0 70 1017 1817 0 8 9 717 10 18 0 1 77 108 1871 0 7 78 10 1898 70 9 79 78 1077 19 80 7 8 78 109 190 90 7 9 78 110 197 00 80 98 777 110 000 Liquid Overpressure Factors To determine capacities at other than % overpressure/accumulation, multiply capacity shown by: 10% acc. = 0. 1% acc. = 0.8 0% acc. = 0.9 Models 18, 8 capacities UL/FM Certified capacities [1] Size (in) GPM x 00 x 1000 x 000 1. Rated at 100 psig set pressure and % accumulation 1 psig.
Selection guide Example: 091 K - M 01 A M S 000 Model 091 18 8 Connection type A Female x female NPT H 1# flange x 1# flange K 0# flange x 1# flange Connection size G 1½" inlet x 1½" outlet H " inlet x " outlet J ½" inlet x ½" outlet K " inlet x " outlet M " inlet x " outlet P " inlet x " outlet Variation 01 Catalog standard 0 SS seat and disc (all models except Model 18K-P) 0 Model 91 w/handwheel (K, M and P inlet only) 0 SS seat and disc (Model 18K-P only) 0 Models 18 and 8 epoxy coated body and bonnet internal surfaces (except Model 18K-P) 0 Model 18K-P epoxy coated body and bonnet internal surfaces 0 Model 91 epoxy coated body and bonnet internal surfaces 0 SS seat and disc with epoxy coated body and bonnet internal surfaces Model 91 SS seat and disc with Viton O-ring seal Design revision Indicates non-interchangeable revision Current design at revision 'A' Valve service M Liquid Spring material C Aluminum coated, ASTM A1 steel (G, H, J inlet sizes only) S Aluminum coated, ASTM A9 steel (K, M, P inlet sizes only) Set pressure 000 psig 000 00 psig Viton is a registered trademark of The Chemours Company. 017 Emerson. All rights reserved.