RETSCO, Ltd. When Quality Counts, Count on RETSCO, Ltd Shear Relief Valve Catalog 3" 2" Check out our website: www.retscoinc.com
Quick Reference for Top Level Assembly Part Number ASSEMBLY PART NUMBER PRESSURE SERIES 0-000 27-2750 40-4000 50-5000 BODY MATERIAL STEM MATERIAL SUB MATERIAL 2-Steel 3-SS 2-Steel 3-SS BASE PART NO. 2" - 000: 2656 - XX X 3 X 2" - 2750: 735-2" - 5000: 735-3" - 4000: 2404-3" - 5000: 2404 - Product Specification & Data OPEN COVER CLEARANCE For turbulent, nonvaporizing flow conditions, the C v values below can be used in the formulas: q = Cv P P = ( Gf q = Gallons per minute of flow through the valve. q Cv ) 2 x Gf DISCHARGE P = Pounds per square inch pressure drop across the valve. Gf = Specific gravity of fluid. A B VALVE SIZE C V 2" - 000 56 2" - 2750 52 2" - 5000 25 3" - 4000 79 3" - 5000 66 SHEAR PIN PIN DIAMETER NUMBER (IN)±.002 #6.20 #0.20 #30.92 #40.206 #50.245 #60.260 INLET SIZE 2"-000 3"-4000-2750 -5000 DIMENSION -5000 A 2.94 5.8 B 5.25 6.88 C 3.38 4.63 THREADS 2"- /2 API LP 3"-8 API LP ASS Y. WEIGHTS 23 lbs. 35 lbs. C SHEAR PIN VALVE SIZE NUMBER SETTINGS (PSI) (ONE ONLY) 2" - 000 #6 400, 600, 800, 000 2" - 2750 #0 250, 750, 2250, 2750 2" - 5000 #0 2300, 3200, 400, 5000 #30 2400 3" - 4000 #40 300 #50 3600 #60 4000 #30 2800 3" - 5000 #40 3200 #50 400 #60 5000 2
2" RETSCO Shear Relief Valve Parts List Ref. Qty. Description & Pressure (psig) No. Material,000 2,750 5,000 2 3 4 5 6 7 4 5 6 7 8 0 9 20 WT. 23.0# INLET 2"--/2 API LINE PIPE 3.375 OPEN COVER 8 9 0 2 3 OUTLET 3 (7.69) 5.250 2 2 3 2 4 5 6 7 8 9 0 2 Cover Latch Spring Kit (Items 2, 3, & 4) Screw 8-8 SST Hex Nut 8-8 SST Leaf Spring SAE 060 Shear Bar Stem Bushing A438-70-Gr Cushion Ring Buna-N 2368 720 7065 7027 2372 Shear Pin Kit 7458 7459 SAE 020 0-(#6) 0-(#0) (color) (olive) (copper) Pin, Shear Bar AISI 440 Washer SAE 020 548-3757 5884-0336 2 Cotter Pin 8-8 SST 542-0932 2 Pin, Cover 548-37537 3 4 5 6 7 8 9 20 2 22 23 5 Spring, Cover SAE 085 Body A26 WCB Stem, Universal Piston Piston Seal Kit (Items 7 & 8) Upper Element Delrin (white) Lower Element HNBR (black) Gasket, Copper AISI 430 Caution Tag Service Tag Drive Screw 8-8 SST 2375 7062-002 2373-004 2373-007 2373-006 2373-005 2929 240 568 293 2379-002 2930-002 2374-002 2379-003 2930-003 2374-003 9723 2656-0232T 735-27232T 735-50232T 656 Delrin is a registered trademark of E.I. Du Pont De Nemours & Co. (Inc.)
3" RETSCO Shear Relief Valve Ref. Qty. Description & Pressure (psig) Parts List No. Material 4,000 5,000 Cover 2937 Latch Spring Kit (Items 2, 3, & 4) 720 2 2 Screw 8-8 SST 3 2 Hex Nut 8-8 SST 4 5 6 7 8 9 0 Leaf Spring SAE 060 Shear Bar Stem Bushing A438-70-Gr 7067 7028 Cushion Ring Buna-N 2939 Shear Pin Kit SAE 020 7460 (0 of each size) Size #30 #40 #50 #60 P/N 7460-30 40 50 60 (color) (black) (yellow) (silver) (copper) Pin, Shear Bar AISI 440 Washer SAE 020 548-37527 (included with item 9) 2 3 4 20 5 6 7 4 OPEN COVER 2937-0 8 9 0 2 3 (8.938) 2 Cotter Pin 8-8 SST 542-0932 5 2 Pin, Cover 2093 3 4 Hair Pin SAE 060 Body A26 WCB (included with item 2) 7066 6 7 OUTLET 5 Piston 2942 622 8 6.875 6 Seal, Piston Buna-N 2945 242 9 7 8 Washer SAE 020 Gasket, Copper 5884-0993 2954 WT. 35.0# 3"-8 API LINE PIPE 9 AISI 430 2952-002 2953-002 2952-003 2953-003 INLET 4.625 20 Spring Pin SAE 060 2072-04 2 Caution Tag 9723 22 Service Tag 2404-40232T 2404-50232T 23 Pin Gauge Tag 6543PG 24 6 Drive Screw 8-8 SST 656 4
RETSCO, Ltd. When Quality Counts, Count on RETSCO, Ltd Specializing In: Reset Relief Valves Shear Relief Valves Rig Expendables Solids Control Equipment Drill Pipe Float Valves Lancaster Production Chokes and Actuators Lancaster Retrofit Choke Upgrade Kits For More Information Call... 723 Breen Road Houston, Texas 77086 (28) 93-77 (888) 242-0492 (28) 93-70 Fax Visit our website www.retscoinc.com
Products Safety and Installation Guidelines INSTALLATION AND MAINTENANCE Once a week during operation and at every start-up after the valve has been out of service, inspect the valve for proper operation. With no pressure on the valve inlet, remove the shear pin and rotate the shear bar of the stem top. The RETSCO Relief Valve is installed as close as possible to the source of pressure. On a drilling rig, it is normally coupled to one of the risers on the pump discharge header. There must be no valve or restriction between the relief valve and the pressure source. Discharge outlet of the valve is fitted with a short nipple and union, to permit access to the valve interior for inspection. From the union, piping is laid by the most direct route to the mud tank or pump suction piping. It is vital that there be no valves or restrictions in the discharge line which may create a back pressure on the relief valve discharge. Discharge piping must be directed in a downward slope to prevent any fluid being left in the discharge line at any time. This also will help a frozen slug from forming and lodging in the discharge piping during cold weather operations. SETTING No other pin or shear device of any kind is to be used, since the setting of the valve may be seriously altered thereby. The required shear pin is shown on the setting plate which is attached to the top of the valve. Different pressure settings, in pounds per square inch, are also indicated opposite each hole through body and shear bar. One shear pin only, of the proper size is inserted in a hole corresponding to the desired valve pressure setting. Corrosion and vibration and other factors may result in a variation of relief pressure from setting pressure. Relief pressure may be as much as 0-5% above or below setting pressure in normal operation. RESETTING When a valve relieves, shut off the source of pressure at once, to prevent erosion of the seat and discharge piping. Correct the source of over-pressure. With no pressure on the valve inlet, push the stem into the body until the end is between the shoulders, then rotate the shear bar against the stem and push down to align the shear pin holes. Insert a new shear pin in the hole corresponding to the proper setting pressure. It is recommended that a piece of wood or other soft material be used to push on the end of the stem and on the top of the shear bar. The stem or shear bar should never be hammered during resetting. Slowly apply pressure to the valve inlet until the stem moves out of the body and projects above the shear bar reccess. Do not attempt to observe stem travel by looking through the discharge side of the valve. The valve discharge (outlet) is to be piped to the pit, mud tank or pump suction line while pressure is on the valve inlet. Remove pressure and reset the valve by hand, assuring that the stem moves freely through the body and sub. If there is any indication of binding or inability to move the stem freely, disconnect the discharge piping at the union and inspect the interior of the valve for solidified mud or other impediment to free valve operation. Application of general purpose grease to the valve top between the shoulders will assist in keeping the shear bar from binding. If the valve is freely operable, reset it, replace the shear pin and close the cover. CAUTION Improper use or maintenance or RETSCO s relief valves can cause excessive pressures which may result in property damage and/or serious personal injury or death. Use only one RETSCO oem shear pin of the size shown on the setting plate. Do not hammer on the shear bar, stem, or shear bar slot.the pressure setting must not exceed adjoining system equipment pressure ratings. Install, set, maintain and inspect valves as instructed by this publication. Warranty RETSCO, Inc. warrants its products to be free from defects in material and workmanship under normal use and service for a period of () year from date of shipment. Any part which is determined by RETSCO to be defective in material or workmanship and returned to RETSCO shipping cost prepaid, will be, as the exclusive remedy, repaired or replaced, or if agreed upon, refund of the purchase price in exchange for the product. Any liability for consequential and incidental damages is expressly disclaimed. RETSCO s liability in all events is limited to, and shall not exceed, the purchase price paid. 5