LO TORC Plug Valve The high value, dependable performance, and low maintenance requirements of Halliburton Lo Torc valves can help reduce overall operating costs and help cut downtime. These features have made Lo Torc valves the choice of high pressure plug value users, worldwide: Provides Outstanding Value Even though it leads the industry in quality and performance, the Lo Torc valve, size for size and service for service, is priced with or below every other high pressure plug valve on the market even valves without stainless steel plugs. Helps Reduce Valve Replacement Costs The rugged construction of the Lo Torc valve provides long, dependable service under severe conditions. The stainless steel cylindrical plug is heat treated to help eliminate galling during operation and provides maximum resistance to corrosion. Meets A Broad Range of Operating Requirements Lo Torc valves perform dependably at high working pressures. The sealing principle of the valve compensates for body deflections. Each valve is hydrostatically tested to the pressure specified by API 6A. Offers Installation Versatility Lo Torc valves are lightweight. This feature makes the valve suitable for many applications, including mobile installations. Helps Reduce Maintenance Costs The Lo Torc design provides for in-line maintenance. Repair or maintenance can be
accomplished in minutes with the valve body left in the line. Total disassembly of the entire valve involves removing only two capscrews, adjusting nut, and handle adapter or wrench. Every part in the Lo Torc valve may be replaced with standard parts. None of the parts requires factory return of the valve for servicing. Even in high pressure services, the Lo Torc plug valve is easy to operate. Unique design characteristics make this possible: 1. The cylindrical plug eliminates jamming or wedging induced by pressure acting against differential areas (a problem inherent with a tapered plug). 2. The plug is further pressured balanced by identical stem seals at each end. This feature eliminates costly and inefficient thrust bearings. 3. A initial seal between the plug and valve inserts is obtained without lapping, selective assembly, or excessive force. The valve inserts are tapered on the OD to match the valve body cavity. The inner surfaces of the inserts are precision ground to exactly the same diameter as the plug. The inserts are parted into identical halves that, when aligned in the valve body by using the adjusting nut, transmit a firm, uniform clamping action to the sealing area. 4. The plug and inserts are free to "float" downstream to compensate for temporary body deflection. As pressure is increased, the seal between plug and downstream insert half is made more effective. Since only a small area is under direct mechanical bearing, the operating torque does not become excessive. (In most other valve designs, the entire plug surface contacts the body and is subjected to frictional forces.) 5. Frictional forces are also reduced by the design of the stationary o-ring seal between inserts and body cavity. Differential pressure acts on the section of the insert sealed by the o-ring, transmitting a force against the plug. Since the seal area is smaller than the bearing area, this compressive force is considerably less than similar forces encountered in valves that do not have this design. Reduction of this force is directly responsible for reducing operating torque without sacrificing seal efficiency.
1. Valve body. The Lo Torc valve body is alloy steel, heat treated for extra strength and durability for high pressure service. 2. Plug design and material. The balanced cylindrical design of the plug (or core) eliminates longitudinal loading. To resist corrosion, the plug is made of stainless steel (standard on every Lo Torc valve). 3. Valve inserts. The valve inserts are tapered on the OD to provide easy adjustment for maximum sealing and plug alignment. The inserts are machined with a raised surface surrounding the o-ring groove. This raised surface (boss) is the only portion of the insert which contacts the valve body and serves as the bearing area on the plug. This design reduces the torque required to operate the valve. Various types of inserts are available. Ductile iron or cast iron inserts (depending on size) are recommended for general fluid service applications. Sealing is due to metal-tometal contact between the insert and the plug. For sour or corrosive service, aluminum bronze inserts are available. 4. End connections. The end connections are hammer union, threaded, or flanged. Flanged connections conform to the dimensional and material requirements of API 6A. Grayloc hubs, butt welds, and other custom end connections also are available. 5. Adjusting nut. The adjusting nut is alloy steel. An o-ring seal is provided around the adjusting nut. 6. O-ring seals. For standard service, 90-durometer nitrile o-rings seals are recessed into grooves in each insert and below the adjusting nut threads. For corrosive applications and temperature extremes, Teflon or fluoroelastomer o-rings are available.
7. Plug seals. The stem diameters at the top and bottom of the plug are sealed by specially designed packing rings made of 75 durometer nitrile permanently bonded to brass reinforcing washers. For moderate temperatures with corrosive fluids or solvents, seals of fluoroelastomer with a stainless steel backing ring are available. For applications involving extreme temperatures or the handling of highly corrosive media, a Teflon seal ring, self-energized by an inconel spring, can be provided. Maximum service temperatures are 250 F for nitrile and fluoroelastomer and 300 F for Teflon. 8. Lubrication system. Lubricant is supplied through the conveniently-placed grease fitting, giant buttonhead type. The lubrication chambers above the below the plug are connected by recesses between the two valve inserts. 9. Valve operation. Full operation of the valve requires only a quarter turn (90 ) of the plug. A steel wrench or a cast steel handle adapter, equipped with equidistant operating bar sockets is available for all valves with bore sizes from 1 in. through 3-1/8 in. This socket design is intended to simplify operation of the valve, regardless of its installed position or location. An operating bar is also available for use with the handle adapter. Valves with 3-1/16-in. and larger bores are operated with a gear operator. Pneumatic or hydraulic actuators are available on special order for all valve sizes. 10. Sour service. Valve assemblies for sour service conform to NACE MR 01-75. Plugs of monel or 316L stainless, aluminum bronze inserts, and seals of Teflon or fluoroelastomer are used. 11. Certification. All Lo Torc plug valve assemblies are traceable. Material chemical certificates and pressure test certificates are available for any valve assembly. Valves identified as "certified" also have
mechanical properties included with the material certificates. Certificates should be requested at the time of ordering. Lo Torc Plug Valve - Threaded Ends Female API Line Pipe Threads * Available on special order. ** Part number includes gear operator. 1 Lo Torc valves for handling sour gas/fluids conform to NACE specifications for H2S service. These valves incorporate aluminum bronze inserts, Monel or 316L plugs, Teflon or fluoroelastomer seals and specially heattreated components. 2 Handle adapter is standard and is furnished with 1-1/2-in. regular opening valves.
Female External Upset Tubing Threads Ring joint type flanged ends are standard on Lo Torc valves. Other flanged end connections are available on special order.
Gear operator for 4-1/16 in., 2,000, 3,000, and 5,000 full opening Lo Torc plug valves with flanged ends.
Flanged Ends - Part Numbers and Dimensions * Available on special order. 1 Lo Torc valves for handling sour gas/fluids conform to NACE specifications for H2S service. These valves incorporate aluminum bronze inserts, Monel or 316 plugs, Teflon or fluoroelastomer seals, and specially heattreated components. 2 Part No. includes gear operator. 3 Straight bore diameter. 4 Does not include gear operator. Operating wrench must be ordered separately. Not available. 3-1/16 in., 10,000 full opening and 4-1/16 in. 10,000 regular opening flanged valve. 10,000 WP comes with gear operator as standard.
These valves are available with special end connections for a wide variety of applications and with working pressures ranging as high as 15,000 psi (20,000 psi test). All design and operating features of the regular Lo Torc plug valve are included in special service valves. Lo Torc Plug Valve Specifications - Special Service Valves - Line Pipe Threads * Part number includes handle adapter ** Part number includes gear operator
Other Special Valves In addition to the valves shown, valves with special threads, special flanges, unequal flanges, flanged by threaded connections, or any other type of end connections can be furnished upon special order. Order by size, pressure, and catalog number. 1 in. through 2 in. sizes Lo Torc Plug Valves with Union End Connections 1 Overall length (Dimension A) is face to face of the thread half to nut body only. The extension of the wing nut is not indluded. 2 Lo Torc plug valves with 2-in. 1502 and 3-in. 1502 connections are available with certification: part numbers 9.1277 (1 in.), 9.1267 (2 in.) and 11.5091 (3 in.). Product certificates are available request when ordering.
Weights and dimensions are the same as given for the standard, 1-in., 2-in., and 3-in. valves listed above. Other sizes available on request. 3 Operating torque is given for direct stem operated valves only, and at maximum rated working pressure. The torque given is an average reading of new valves tested with water. 3-in. and 4-in. size valves are equipped with manual gear operators so direct stem operation is not required. 3 in. and 4 in. sizes CAUTION: The fact that a valve has never leaked in service does not necessarily mean that the inserts do not need to be replaced. The inserts may wash out and cause the valve body to erode before leakage is noted. A planned program of maintenance at specific intervals is the key to keeping downtime and repair cost at a minimum. For Lo Torc plug valve applications involving throttling or choking, the all metal inserts should be used. Lo Torc Valve Operation and Care Proper operation and maintenance can help extend the service life of Lo Torc valves. Due to widely varied applications, no specific frequency of maintenance or in-service inspection for the Lo Torc plug valves can be recommended. Periodic and frequent inspection of each valve will provide a basis for predicting the life or usefulness of the plug and inserts. Replacing these parts when they are eroded or worn will help prevent any erosion of the body. Disassembly and Reassembly Instructions Disassembly Remove the wrench (15) or handle adapter (2), with stop collars (14). Loosen adjusting nut (7) with operating bar or hex wrench. Remove adjusting nut, plug
(12) and inserts (10). If necessary, place a wooden block on top of the plug stem and tap downward. At this point, the valve body (1) should be inspected for any interior erosion or pitting. O- ring (11) on the inserts should be replaced if needed. The o-ring (8) sealing the adjusting nut should also be replaced if worn. Replacing the plug stem packing (9) at the top and bottom of the plug is usually necessary. If the valve shows signs of leakage, or if inserts show any excessive wear or pitting, the inserts should be replaced with standard parts (see part listing on back page). Wipe all old lubricant from inside the valve body. Reassembly Install o-rings in recesses of inserts and in adjusting nut groove. Install plug stem seals (9) in recesses in the top of the valve body and in adjusting nut. The seal backing ring is to be positioned away from pressure. Coat cleaned plug, inserts, and adjusting nut (threads) with recommended plug valve lubricant.
Exploded View 2-in. Lo Torc Plug Valve Fill void spaces inside the body with the same lubricant. This lubricant may be ordered in 3/4-lb packages under part number 70.31058. Install lower end of plug through adjusting nut and push down to shoulder. Use capscrews, flat washer, and lock washer to secure plug to adjusting nut. Tighten capscrew. Check for proper positioning of insert retaining pins(13) inside valve body. Place inserts on adjusting nut around plug, aligning flow holes in inserts with hole through
plug. Place plug, inserts, and adjusting nut into valve body with insert retaining pins keying into slots in inserts. Tighten adjusting nut into body with prescribed torque for adequate sealing (see adjustment below). Install stop collars and handle adapter (or wrench) on top of valve. Be sure flow indicators are in line with the slot in the top stem of the plug. Rotate plug several times to distribute excess lubricant through flow passage of body. Lubricate the valve through the grease fitting(3) on top of the valve body to insure total filling of the void spaces inside the valve. Valve Adjustment at Zero Pressure The proper adjustment of a Lo Torc plug valve is imperative to maintain tight sealing under pressure. The inserts should be adjusted to give the following torque to rotate the plug. (This adjustment is made by tightening or loosening the adjusting nut(7). 1-in. valves 30-40 ft-lbf 1-1/2-in valves 30-40 ft-lbf 2-in. valves 40-60 ft-lbf 2-1/2-in. valves 50-60 ft-lbf 3-in. valves 60-70 ft-lbf 4-in. valves 70-80 ft-lbf Extremely high working pressure may require torque settings at the upper end of the prescribed range to properly seal the valve. If so, this higher torque adjustment should be maintained by checking the adjusting nut at regular intervals. Repair Kits - Lo Torc Plug Valves Each kit includes all components necessary to renew one Lo Torc Plug Valve Plug 1 Inserts 1 set O-ring-Insert 2 O-ring-Adj. Nut 1 Seals-Stem 2 Lubricant 1
Repair Instructions 1 Lo Torc Plug Valves - Replacement Parts List
1 Aluminum bronze is suitable for standard H2S service. 2 Listed seal fits seal glands of.5 in. depth. For glands.25 inch depth use teflon seal part no. 9.81916. 3 Teflon plug stems and Teflon O-rings used in H2S service valves. 4 Valves with a pin part number for loc 16 are to have loc 16 inside of pin loc13. 5 Monel and 316 stainless for H2S service. 6 Plug Stem seals of Viton material w/stainless steel back-up ring: 8.75094 for 1 in. and 1.3 in. sizes; 9.81717 for other sizes. Viton O-rings; 7.XXXXX where XXXXX is the same 5 digits after the decimal point of the nitrile O-ring. www.halliburton.com Send questions or comments about this site to Halliburton Service Center or call U.S. (877) 263-6071 or outside U.S. (281) 983-4900. Copyright 2008 Halliburton. All Rights Reserved. Terms and Conditions