Valtek Valdisk 50 Control Valves
Contol Valves Compact, field reversible actuator Self-centering seat Blowout protection increases safety Available in wafer or lug-style body Blind end also eliminates one gasket surface Class 50 rating available in thru -inch sizes Figure : Valdisk 50 TM Design The Valdisk 50 TM is a high performance rotary valve designed for controlling flow in most ANSI Class 50 applications. Available in a wafer or lug-style body, the Valdisk 50 is a low cost valve that provides tight shutoff and is available for quick delivery. It has an eccentric-cammed disc that rotates out of the seat upon opening. This double-offset disc design reduces seat wear and leakage and allows a low breakout torque requirement. The valve design provides additional safety with its fail-close action on loss of supply air or positioner signal. The typical liquid pressure recovery factor (F L ) of the Valdisk 50 rotary valve is better than most butterfly valves, reducing the tendency to cavitate or choke. The body has a blind end feature that reduces potential leakage by eliminating one gasket surface. Larger valve sizes (8, 0, -inch) are designed with blowout protection. Several packing options are available, from the standard Teflon V-ring configuration to Valtek s SafeGuard and SureGuard fugitive emissions packing. A floating self-centering seat is held in place by an internal seat retainer that increases sealing capacity as it aligns with the disc. Shutoff is typically better than ANSI Class VI. While carbon and stainless steels are the standard materials for the Valdisk 50 body and disc, other alloys are available for special applications requiring them. This makes the Valdisk 50 useable in more than 75 percent of all class 50 services in the flow control industry. Maintenance is easy with the Valdisk 50 valve. The non-selective disc and shaft are easily interchanged with new parts, eliminating the need to replace whole assemblies for one component. And the Valdisk 50 rotary valve uses Valtek s standard rotary actuator to provide high torque and high stiffness for accurately controlling the valve disc even while operating close to the seat. The Valdisk 50 rotary valve is available in sizes through -inches and has an operating temperature range of -00 to 00 Fahrenheit. Its modern engineering design, and use with the Valtek spring cylinder rotary actuator, makes the Valdisk 50 rotary valve an economical and dependable control valve for today s class 50 applications.
Features and Advantages Features Double offset disc Self-centering seat Integral disc stop ne-piece shaft Bi-directional shutoff Non-selective disc & shaft Wafer or lug-type body Blind end High flow capacity Concave disc Positive blow out protection* Non clogging seat design Advantages Tighter shutoff Reduced seat wear Low breakout torque assures accurate throttling, even close to the seat Disc pulls out of seat immediately, preventing seat wear Accurate throttling due to disc profile when rotating into the seat Increased safety as pressure drop assists disc into seat upon air failure Allows seat to align with disc, increasing sealability Prevents damage to seat due to overstroking Tighter shutoff through reduced deflection Allows valve to be mounted with shaft upstream or downstream Easier maintenance Reduced cost replace part needed, not entire assembly Rugged and lightweight for easy handling and maintenance Reduced leakage possibility due to one less gasket surface Capacity greater than globe, plug and cammed control valves Increased flow capacity High safety factor for personnel and nearby equipment Increases sealability and reduces maintenance requirements No sediment build up in pockets Valdisk 50 also capitalizes on established features of Valtek s other product lines: Cylinder actuator High thrust for high-performance throttling Compact and lightweight for easier servicing and maintenance Fully interchangeable with Valdisk and ShearStream actuators Actuator air pressures allowable up to 50 psi Fully enclosed, air purged Extra safety transfer case Prevents atmospheric corrosion of actuator internals Disc position indicator mounted on transfer case Wide interchangeability Spare parts stocking requirements minimized Inventory costs reduced Many Mark ne and ShearStream parts are interchangeable with Valdisk Available in variety of materials Carbon steel, 6 stainless steel body and other alloys Seat interchangeability New seat easily installed Spool-type four-way positioner Convertable between I/P and P/P Calibration and maintenance easy due to fewer parts The combined features designed into Valdisk 50 create a valve measurably superior to most other rotary valves. The information and specifications contained in the following pages are provided for comparison. *Not applicable to,, and 6-inch sizes.
Seat Poisson Effect Poisson s ratio is based on the premise that during elastic deformation no volume change occurs. This means, if an elastomeric -ring is deformed on one side due to pressure, the -ring will bulge out on the side not subjected to the pressure. Because of their resilient ability to remember and return to their original shape, -rings can be used to pre-load the seat. This type of design is effective in achieving tight shutoff. Valdisk 50 Seat The Valdisk 50 uses the Poisson effect in its seat design by encasing a Viton -ring with Teflon. The design provides a tight shutoff that usually exceeds an ANSI Class VI shutoff. Figure shows the deformation of the seat into the gap between the disc and valve body as pressure is applied to its upstream side. In Figure, the seat is forced into the gap between the disc and seat retainer as pressure is applied to the downstream side of the disc. Extensive testing has proven the Valdisk 50 seat design to be effective, not only in ensuring a tight shutoff, but in reducing wear on the sealing parts thus reducing maintenance requirements. The design also reduces breakout torque requirements. Seat is forced into gap between body and disc causing valve to seal. Figure : Poisson Effect with Pressure Upstream Pressure Pressure Seat is forced into gap between disc and retainer causing valve to seal. Figure : Poisson Effect with Pressure Downstream Packing Retainer Packing Shaft Packing Box Nut Gland Flange Taper Pin Disc Thrust Washer Shaft Bearing Packing Box Stud Packing Follower Shaft Bearing Thrust Washer Body Disc Stop Figure : Body Subassembly, Sectioned View
Specifications Table I: Body Specifications Sizes (inches),,, 6, 8, 0, Body forms Wafer, lug Body rating ANSI Class 50 Shutoff rating ANSI Class VI perating -00 to 00 Fahrenheit temperature (-0 F for carbon steel) Fire seat API 607 (pending) rating Exxon (pending) Actuator Pneumatic (sq.in.): 5, 50, 00, types 00; electro-pneumatic; manual Positioner Pneumatic: -5, 6-0 psi; signals electo-pneumatic: -0, 0-50mA Body Size (inches) Table II: Flow Coefficents Flow Coefficient (C V at 90 rotation) Shaft Dn Strm Shaft Up Strm 55 59 7 0 05 5 6 900 000 8 600 50 0 680 500 600 850 Table III: Valve/Actuator Compatibility Actuator Spring Valve Size (inches) Size Size (sq. in.) 6 8 0 5 STD. 5 H.D. 50 STD. 50 H.D. 00 STD. 00 H.D. 00 STD. 00 H.D. F L Table IV: Materials of Construction Body, disc, Carbon steel, stainless steel, Alloy 0, retainer Hastelly C, Inconel, Monel, nickel Shaft 7- PH (std.), stainless steel, Alloy 0, Hastelloy C, Inconel, Monel, Nitronic 50 Bearing Ryload (rolled stainless steel with Teflon insert) Packing Teflon V-ring (std.), Grafoil, SafeGuard, SureGuard Seat Teflon energized with Viton -ring.95.90.85.80.75.70.65.60 TYPICAL BUTTERFLY VALDISK 50.55 0 0 0 0 0 50 60 70 80 90 00 0 Percent pen Figure 5: Typical Valdisk 50 F L Curves* *Actual pressure recovery values may vary with valve size and shaft orientation. Table V: Estimated Shipping Weight (lbs / kg) (with standard actuator and positioner) Valve Size Wafer Body Lug Body 0 8 0 6 9 5 58 6 6 96 0 7 8 0 50 56 0 67 87 0 86 0 9 5 5
Dimensions DISASSEMBLY CLEARANCE F E C H J K A B DISASSEMBLY CLEARANCE D G Actuator Size Size Shaft (in.) (sq.in.) Size Table VI: Valdisk 50 Dimensions (inches/mm) A B C D E F G* H J K 5 0.6 5.5 6.5 9. 8. 67 6.0 5 6.5 65.8 6. 8 5.6 6.5 65 50 0.6 5.5 6.5 9 8.0 57 9. 9 8.0 0 9..8 6.0 5 6.7 70 7. 88 5 0.6 5. 79. 0. 9. 88 6.0 5 6.5 65.9 8. 8 5.6 6.5 65 50 0.6 5. 79. 0 8.0 57 0.0 508 8.0 0 9..9 8.0 5 6.7 70 7. 88 5 0.8 0.6 9.7. 9.7 500 6.0 5 6.5 65. 5. 8 5.6 6.5 65 50 0.8 0.6 9.7 8.0 57 0.5 5 8.0 0 9.. 5.0 5 6.7 70 7. 88 6 50 0.9.7 9.9 5 8.0 57 0.7 55 8.0 0 9.. 58.0 5 6.7 70 7. 88 6 00 0.9.7 9.9 5.6 57. 587.0 79.5 8. 58. 6 9. 8.5 6 8 50. 8 6.0 5 5.0 8 8.0 57.7 577 8.0 0 9.. 6.0 5 6.7 70 7. 88 8 00. 8 6.0 5 5.0 8.6 57 5. 60.0 79.5 8. 6. 6 9. 8.5 6 0 50. 8 7.7 96 6.7 8.0 57.5 6 8.0 0 9..9 7.0 5 6.7 70 7. 88 0 00. 8 7.7 96 6.7.6 576 7.0 686.0 79.5 8.9 7. 6 9. 8.5 6 00.5 8 8.0 0 8. 6.6 576 8.5 7.0 79.5 8. 8. 6 9. 8.5 6 All dimensions are to be used for estimation only. Certified drawings will be supplied upon request. * Face-to-face, MSP67 Body nly 6
Dimensions, rdering Information DISASSEMBLY CLEARANCE E C SHUT PEN M N J L Table VII: Valdisk 50 Handwheel and Heavy-duty Spring Dimensions (inches/mm) Actuator Size C E J L M N 5 6.5 9 0.0 5 6.0 5 6.9 75.6 58 9.8 9 50.5 597 0. 6 8.0 0 9.. 86.0 05 00 N/A.8 5 9.0 9 0. 6 5. 8 8.0 57 00 N/A.8 5 9.0 9 0. 6 5. 8 8.0 57 rdering Information The following information must be provided when ordering a Valdisk 50 control valve:. Preferred body size and critical dimensions. Start-up and operating conditions: inlet and outlet pressures; temperature, flow rate, fluid s specific gravity or molecular weight, vapor pressure or gas compressibility. Maximum operating temperatures and pressures. Body and disc pressure rating 5. Materials required: body, disc, shaft, packing and bearings 6. Line size and schedule 7. Actuator requirements: type (pneumatic or manual), failure position, size and minimum air supply 8. Actuator position: style and orientation (Figure 6) 9. Accessories required Valdisk 50 Sizing Procedures and data to size Valdisk 50 valves including determining actuator size are contained in Valtek s Quik-Size computer program and Sizing & Selection Manual, sections and 6. 7
Valtek Valdisk 50 Mounting rientations Style A Fail-closed Air-to-open Shaft Upstream Right-hand Mounting Facing Downstream Style B Fail-open Air-to-close Shaft Upstream FLW NTE: Styles B and D may require a heavy-duty spring to achieve failure. Style C Fail-open Air-to-close Shaft Downstream Left-hand Mounting Facing Downstream Style D Fail-closed Air-to-open Shaft Downstream Style C Style D Style B Style A Left-hand Mounting Right-hand Mounting NTE: rientation is standard. rientation positions and are not available in some actuator sizes. Contact factory. Figure 6: Transfer Case Mounting Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible applications. The purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation and maintenance of Flowserve products. The purchaser/user should read and understand the Installation peration Maintenance (IM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve products in connection with the specific application. While the information and specifications contained presented in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or as a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice. Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any of its worldwide operations or offices. For more information, contact: 8rig. /9 For more information about Flowserve Corporation, contact www.flowserve.com or call USA 97 6500 Manufacturing Facilities Valtek Control Valves 50 N. Mt. Springs Prkwy. Springville, UT 866 Phone 80 89 86 Facsimile 80 89 79 Valtek-Kammer Valve 00 Parkway View Drive Pittsburgh, PA 505 USA Telephone 787 880 Facsimile 787 9 Valtek-Kammer Ventile Manderscheidstr. 9 5 Essen, Germany Telephone (9) 0 89 9 5 Facsimile (9) 0 89 9600 Valtek-Kammer Vannes Alläe du Quartz CH-00 La Chaux-de-Fonds Switzerland Telephone 9 6 Facsimile 9 6 5 99 Flowserve Corporation. Flowserve and Valtek-Kammer are registered trademarks of Flowserve Corporation. Quick Response Centers Valtek Houston 5 Railroad Street Deer Park, TX 7756 USA Telephone 8 79 9500 Facsimile 8 79 85 Valtek Philadelphia 0 Chelsea Parkway Boothwyn, PA 906 USA Telephone 60 97 8600 Facsimile 60 97 6680 IS 9000 CERTIFIED SELECT LCATINS