RETSCO, Ltd. Shear Relief Valve Catalog. When Quality Counts, Count on RETSCO, Ltd. Check out our website:

Transcription

1 RETSCO, Ltd. When Quality Counts, Count on RETSCO, Ltd Shear Relief Valve Catalog 3" 2" Check out our website:

2 Quick Reference for Top Level Assembly Part Number ASSEMBLY PART NUMBER PRESSURE SERIES BODY MATERIAL STEM MATERIAL SUB MATERIAL 2-Steel 3-SS 2-Steel 3-SS BASE PART NO. 2" - 000: XX X 3 X 2" : 735-2" : 735-3" : " : 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" " " " " SHEAR PIN PIN DIAMETER NUMBER (IN)±.002 #6.20 #0.20 #30.92 # # # INLET SIZE 2"-000 3" DIMENSION A B C 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" #6 400, 600, 800, 000 2" #0 250, 750, 2250, " #0 2300, 3200, 400, 5000 # " # # # # " # # #

3 2" RETSCO Shear Relief Valve Parts List Ref. Qty. Description & Pressure (psig) No. Material,000 2,750 5, WT. 23.0# INLET 2"--/2 API LINE PIPE OPEN COVER OUTLET 3 (7.69) 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 A Gr Cushion Ring Buna-N Shear Pin Kit SAE (#6) 0-(#0) (color) (olive) (copper) Pin, Shear Bar AISI 440 Washer SAE Cotter Pin 8-8 SST Pin, Cover 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 T T T 656 Delrin is a registered trademark of E.I. Du Pont De Nemours & Co. (Inc.)

4 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) Screw 8-8 SST 3 2 Hex Nut 8-8 SST Leaf Spring SAE 060 Shear Bar Stem Bushing A Gr Cushion Ring Buna-N 2939 Shear Pin Kit SAE (0 of each size) Size #30 #40 #50 #60 P/N (color) (black) (yellow) (silver) (copper) Pin, Shear Bar AISI 440 Washer SAE (included with item 9) OPEN COVER (8.938) 2 Cotter Pin 8-8 SST Pin, Cover Hair Pin SAE 060 Body A26 WCB (included with item 2) OUTLET 5 Piston Seal, Piston Buna-N Washer SAE 020 Gasket, Copper WT. 35.0# 3"-8 API LINE PIPE 9 AISI INLET Spring Pin SAE Caution Tag Service Tag T T 23 Pin Gauge Tag 6543PG 24 6 Drive Screw 8-8 SST 656 4

5 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 Breen Road Houston, Texas (28) (888) (28) Fax Visit our website

6 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