Designed for blow-off service in boiler systems with pressures of 3,206 psig.
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1 Designed for blow-off service in boiler systems with pressures of 3,6 psig. General Description asic requirements for the design and use of blow-off valves are established by the SM Power oiler Code, Section l. The general form of a valve, the materials of its construction, allowable boiler pressures, and the installation of the valve are all determined by the code. Yarway blow-off valves are designed in conformance with all code requirements (SM Section l, NSI 3., NSI 6.34). ecause the primary purpose of a blowoff valve is removal of dirt, sediment and scale, the boiler code requires that valves which have dams or pockets in which sediment can accumulate cannot be used in blow-off service. This means that ordinary globe valves cannot be used as blow-off valves. Yarway valves are especially designed for the punishment of blow-off service in boiler systems with pressures of 3,93 psi. The rugged construction of these valves can successfully withstand the combination of problems inherent in the service a service in which high pressures result in high velocities which can cause wire drawing and cavitation of metal surfaces. The valves must also withstand the corrosive environment created by acid cleaning of boilers, and the potential wear problems caused by precipitated solids. The valves are also helpful in maintaining boiler level surge within desirable limits during quick startup of high pressure systems. Two broad categories of Yarway blow-off valves are available; those that operate on a sliding principle and those that operate on a seat-and-disc principle. Features and enefits Seatless Valves No seat will not score with dirt will not plug with dirt will not leak Live-loaded packing will not leak after packing water Slow opening will not rapidly drain boiler drum Features and enefits Unit Tandem Valves combination of hardseat-hardseat or hardseat-seatless valves in a single body eliminates pipe joints reduces potential leaks fits into a confined space Hardseat Valves Stellite valve and seat resists wear provides long service life Flow Control Yarway is either a trademark or registered trademark of Tyco International Services G or its affiliates in the United States and/or other countries. ll other brand names, product names, or trademarks belong to their respective holders. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC-0404-US-0908
2 Type Seatless Open Yoke shows position of plunger in body. all earing Yoke for easy operation of handwheel. Dual Guide Lugs provide proper alignment. Long Stroke Length with threaded stem helps prevent water hammer, which occurs when valve is opened or closed too quickly. Compression Springs maintain continuous pressure on packing rings to keep valve tight regardless of plunger position. Shoulder on Plunger transmits force, in the closed position, through glands to packing rings. Nitralloy Plunger tube resists erosion, high temperatures and sudden shocks. Seatless, sliding design provides polishing action that lengthens life of packing rings. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
3 Flange and drilling data common to all Yarway valve designs are shown below. ll dimensions are consistent with NSI standards and supplied as listed unless otherwise specified. Flange Data Flange Dimensions Diameter Thickness Diameter of Raised Face Size Class Class Class Class Class Class Class Class Class (in.) /8 5 7 /8 6 /4 /6 5/6 2 3 /8 5 /8 2 /6 2 /2 6 / /6 /8 / /6 2 7 /8 2 6 /2 8 /2 9 /4 7/8 /4 3 /4 2 /4 4 3 /6 3 5 /8 2 /2 7 /2 9 5 /8 0 /2 3 /8 7 /8 2 /2 4 5 /6 4 /8 Drilling Data Size No. of Diameter olt Circle Diameter (in.) Holes 3 Class Class 500 Class 2500 Class Class 500 Class /4 3 /2 4 4 /4 /2 4 7/8 /8 /4 4 /2 4 3 /8 5 3 / /4 /8 5 6 /2 6 3 /4 2 /2 8 7/8 /8 /4 5 7 /8 7 /2 7 3 /4 Notes:. Includes /6" raised face psi valves, /4" raised face psi psi only, no " 400 psi valve available. 3. olt holes straddle center lines. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
4 Seatless Valves for Pressures to 935 psi Class 250 to 600 The seatless blow-off valve is a sliding plunger type, opened and closed by means of a handwheel and non-rising stem, and sealed against leakage by packing rings above and below the ports. This valve is provided with heavy coil compression springs under the yoke nuts. Designed to help prevent leaking when the valve is open, yoke nuts are screwed down evenly and tightly placing compression on the springs and the packing rings. mple flow area is provided in the hollow plunger; absence of projections or pockets prevents accumulation of scale and sediment that can impede flow and shorten the life of the valve. nnular space in the body permits pressure to surround the plunger, making the valve a fully balanced unit easy to operate at high pressures. For complete protection of the packing, the valve has a long-stroke plunger so that the packing is never exposed to the mainstream flow. The gland and plunger have double inlet ports to balance flow pressures. This valve is available in angle or straightway styles, cast iron or steel construction, and flanged ends. Operation When the valve is open (plunger raised), discharge occurs through double ports in the lower gland and plunger. The slotted plunger head slides on guides in the valve yoke, preventing rotation of the plunger. stop screw keeps the lower gland in alignment. The yoke permits visual indication of the position of the plunger within the valve body. Upon closing, the shoulder on the plunger exerts a thrust force compressing the packing rings above and below the port in the body. final hard turn of the handwheel gives additional compression of the packing around the plunger, ensuring drop tight shutoff. nd Connections Flange dimensions per NSI 6.5 ctuation Manual handwheel only. Standard Options cid wash trim:. Standard upper gland is replaced with nickel plated steel upper gland. 2. Standard lower gland is replaced with Ni-resist lower gland. 3. Standard plunger is replaced with nickel plated nitralloy plunger. Stop screw with lubrication fitting. Caution plate for tandem sets. Special flanges only when dimensions are within standard flange maximum metal conditions. How to Specify To specify seatless valves for nominal pressures to 600 psi, use figure number shown. Describe as long stroke, balanced sliding plunger type seatless valve. How to Order Order by stating: a. Size b. Figure number c. asic pressure rating d. Connections flanged e. ngle or straightway style Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
5 Seatless Valves for Pressures to 935 psi Class 250 to Materials of Construction (pressure containing envelope) Valve 2 3 and 4 5 and 6 7 Type Class ody Yoke Packing Rings Glands Plunger 250 Graphite, Cast Iron Cast Iron Hard rass SS Filled PTF, STM 26 STM rass or SS Class lloy 3 Support Ring 300 Graphite, Cast Steel Cast Steel Hard rass SS Filled PTF, SM S26 SM S26 35 rass or SS Grade WC Grade WC lloy 3 Support Ring C 600 Cast Steel Cast Steel Graphite, Low SM S26 SM S26 SS Filled PTF, Carbon Steel Grade WC Grade WC SS Support Ring Note:. 36 SS for acid wash trim. Nitralloy Grade H Nitralloy Grade H Nitralloy Grade H Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
6 Seatless Valves for Pressures to 935 psi Class 250 to 600 Figure 3482-R and 3486-R Type Figure 3484-R and 3488-R Type S Dia. S Dia. /6 L pprox. R pprox. P 45 P F D F D C M pprox. /6 Figure 390-R Type C S Figure 392-R Type C S R pprox. L pprox. 45 P F D /4 /4 P F D C M pprox. Dimensions and Weights Press. low-off Figure Number Size Dimensions C v Wt. Rating (max. psi) ngle Straight- (in.) C D F L M P R S (lb.) Class way R 3484-R /4 4 7 /8 /6 2 /6 8 /4 7 /4 4 3 /6 8 3 / R 3484-R /2 4 /2 4 /2 6 /8 3 /6 3 9 /6 8 /4 8 /2 / / R 3484-R /2 7/8 4 3 /6 9 3 /8 9 7 / / R 3484-R 2 /2 5 3 /4 5 3 /4 3 /2 7 /2 4 5 /6 2 7 /8 22 /8 2 /2 9 / R 3488-R 3 5 /6 5 5 /8 9 7 /8 4 7 /8 / /4 6 7 /8 4 3 /6 8 3 / R 3488-R /2 4 7 /6 4 9 /6 6 /8 3 /6 2 7 /8 8 /6 8 /2 /2 5 7 /8 8 3 / R 3488-R /4 2 6 /2 7/8 3 5 /8 9 9 /6 9 5 / /8 9 3 / R 3488-R 2 /2 5 3 /4 6 3 /2 7 /2 4 /8 22 /8 22 /8 2 /2 9 / R 392-R /2 4 /2 8 /4 3 6 /8 /8 2 7 / /8 22 /2 /2 9 5 /8 8 3 / R 392-R 2 5 /4 9 /4 5 6 /2 /4 3 5 /8 25 / / /6 9 3 / R 392-R 2 /2 5 3 /4 9 /2 7 7 /2 3 /8 4 / /4 28 /2 2 / / Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
7 Hardseat Valves for Pressures to 2455 psi Class 600 and 500 The hardseat valve has a seat and disc design with flow entering under the seat. It is opened and closed by means of a handwheel and threaded rising stem. The stuffing box bushing and threaded yoke bushing provide a simple, sturdy guide for the stem. This valve has been designed with thick Stellite facings on the disc and seat to provide the hard wearing, anti-galling surfaces characteristic of Stellite. Operation Hardseat valves are available in angle or straightway styles, socketweld or flanged end connections with manual or electric motor actuation. Usual installation of this valve allows the flow to enter below the seat. s the valve is opened, the lip on the end of the disc restricts the flow until the beveled edge or seating surface of the disc is well away from the seat. This minimizes wiredrawing and protects the sealing faces. The valve should be opened rapidly and fully to help increase the life of the internal parts. Tandem Usage ny two Yarway hardseat valves may be used in tandem for pressures to 2455 psi. The valve nearest the boiler is used as the blowing valve (opened last and closed first) and the valve farthest from the boiler is the sealing valve (opened first and closed last). For pressures to 935 psi, hardseat valves may be used in tandem with Yarway Type C seatless valves. How to Specify For single valves, describe as seat and disc type hardseat valve. Use size and figure number shown. For tandem valves (pressures to 2455 psi), describe as: blow-off valves shall consist of one angle and one straightway (or two angle or two straightway) seat and disc type hardseat valves, installed in tandem arrangement, to conform with requirements of SM oiler Code and suitable for basic pressure rating of psi. How to Order Order by stating: a. Size b. Figure number c. asic pressure rating d. Connections flanged and socketweld for 600 class valves; socketweld for 500 class valves. s an option, buttweld ends are available for 2" and 2 /2" 500 class valves only. e. ngle or straightway style Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
8 Hardseat Valves for Pressures to 2455 psi Class 600 and Materials of Construction Figures 6909, 69, 692, 6929-C, 693-C Figures 6929, 693 Item Part Material Specifications Material Specifications ody Steel SM S-26 WC Steel SM S-05 2 Nozzle with Integral Steel with Integral Steel with Integral SM S-26 WC Seat Stellited Face Stellited Face SM S-05 3 Gland Steel SM S-26 WC 2 Steel SM S-05 4 Split Gland ushing Naval rass 2 Stainless Steel ISI 46 5 Disc Steel with Stellited Seating Face SM S-82 Grade F Steel with Stellited Seating Face SM S-82 Grade F 6 Disc Nut Stainless Steel ISI 40 2 Stainless Steel ISI Stuffing ox ushing Nickel lloy Ni-Resist No. Nickel lloy Ni-Resist No. 8 Yoke ushing Naval rass Silicon rass -37 lloy Stem Stainless Steel STM -582 Type 46 Stainless Steel STM -582 Type 46 0 Handwheel Cast Iron STM -47 Gr Cast Iron STM -47 Gr Hex Nut Steel SM S-94 Gr. 2H Steel SM S-94 Gr. 2H 3 Hex Nut Steel SM S-94 Gr. 2H Steel SM S-94 Gr. 2H 4 olt Steel SM S-93 Gr. 7 Steel SM S-93 Gr. 7 5 Disc Insert Stainless Steel Stainless Steel ISI 40 (heat treated) (heat treated) ISI 40 6 Packing Flexible Graphite Flexible Graphite 7 Sleeve Insert 3 Steel Steel Notes:. /2" 6929 and 293 only. 2" and 2 /2" 6929-C and 693-C body and nozzle are cast SM S26 WC ( C in Figure Number designates cast material); gland SM S27 WC. 2. /2" valve gland material is SM S8 Gr. II; split gland bushing and disc nut material is ISI " and 2 /2" valve only. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
9 Hardseat Valves for Pressures to 2455 psi Class 600 and 500 H Dia. H Dia. M - Open pprox. M - Open pprox. K - Open pprox. T - Open pprox. H Dia. /4 F P D P F D 45 P D F Direction of flow Figure 6909-C Figure 690-C C L - Open pprox. Figure 69-C K - Open pprox. T - Open pprox. H Dia. T - Open H Dia. K - Open T - Open H Dia. 45 P F D 45 P D 45 P D C /4 F C F L - Open pprox. M - Open L - Open Figure 692-C Figure 6929 and 6929-C Figure 693 and 693-C Dimensions and Weights Press. low-off Figure Number Size Dimensions C v Wt. Class (max. psi) ngle Straight- (in.) C D F H K L M P T (lb.) Rating way C 69-C /2 3 /4 3 3 /8 8 / /2 /2 2 7 /8 6 /8 /6 /2 2 3 / C 69-C /8 3 3 /4 9 3 / /8 /2 4 3 /4 8 3 /8 3 3 / C 69-C 2 / /8 0 / /8 /2 6 3 /8 /2 5 /2 2 /2 7 3 / C 692-C /2 4 3 /4 4 /2 2 6 /8 /8 2 7 /8 /2 2 7 /8 7 /4 /6 /2 2 3 / C 692-C / /2 /4 3 5 /8 /2 4 3 /4 9 5 /8 3 3 / C 692-C 2 /2 6 /2 5 7 /8 6 7 /2 3 /8 4 /8 /2 6 3 /8 2 3 /4 5 /2 2 /2 7 3 / /2 5 9 /6 3 7 / /8.92 /2 /2 6 9 /2 6 3 / C 693-C /8 3 7 /8 9 /4 4 / /8 3 /2 7 /6 2 7 /6 7 /6 5 /6 8 / C 693-C 2 /2 5 3 /8 3 7 /8 9 /4 4 / /8 3 /2 7 /6 2 7 /6 7 /6 2 /8 8 / Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
10 Unit Tandem Valves for Pressures to 36 psi Class 300 to 2500 The Yarway unit tandem valve features a one-piece steel block which serves as a common body for both blowing and sealing valves. This construction eliminates interconnecting welds, or bolts and gaskets where flanged valves are required, and makes the unit tandem a compact design. For valves with basic pressure rating to 600 psi (medium pressure unit tandem), the inlet valve is a hardseat type and the discharge valve is of the seatless type. For basic pressure ratings above 600 to 2500 psi, both inlet and discharge valves are hardseat type. ll features of the Yarway single valves are contained in the unit tandem design with the additional advantage of a onepiece, heavy duty construction. These valves are available in right-hand or left-hand body assemblies, carbon steel (SM S-05), socketweld or flanged end connections. ll hardseat unit tandem valves include acid wash trim. In hardseat seatless unit tandem valves, acid wash trim is optional. The hardseat valve of any unit tandem can be equipped with an electric motor actuator (230/460-volt, three-phase, 60-Hertz). Special voltage and standard actuator accessories are available. How to Specify To specify unit tandem valves use size and figure numbers shown. Describe as: valve assembly shall consist of one seat and disc type hardseat valve and one balanced, sliding plunger type seatless valve (or two seat and disc hardseat valves) assembled in tandem arrangement as part of one common body conforming with requirements of SM oiler Code and suitable for pressure rating of psi. When motor actuation is desired, describe as: with electric motor actuation (230/460-volt, three-phase, 60-Hertz). How to Order Order by stating: a. Size b. Figure number c. asic pressure rating d. Connectors - flanged or socketwelding ends (if buttwelding ends are required, include description of profile) e. Hand: right-hand or left-hand f. Trim: standard or acid wash How to Hand Unit Tandem Valves ecause the construction and installation of a unit tandem valve is inherently off-center with respect to the centerline of the boiler outlet, opening and closing of the valve can become difficult if operating space is inadequate on the side of the blowing valve. Therefore, the practice of handing a valve has become part of its specification. This is essentially a statement of planned position for the valve, to the left-hand or right-hand of the centerline of the boiler outlet, by specifying the location of the sealing valve when facing the handwheel of the blowing valve (next to boiler). The drawing shown below should help you to hand or orient your valves correctly. lowdown Valve Handwheel Right Hand a Sealing Valve lowdown Valve Handwheel Left Hand /2" left hand Sealing Valve Specify location (right or left) of sealing valve when facing handwheel of next-to boiler hardseat blowing valve. lowing Valve From oiler Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
11 Materials of Construction (see pages 3-6 for Drawing References) Item Part Material Specification ody Carbon Steel % Max. C (Stellited Seat) SM S-05 3 Spring Steel S Stud Steel SM S 93 Gr. 7 5 xtension Lever Malleable Iron 6 Nozzle Forged Steel % Max. C SM S-05 7 Yoke Steel SM S-05 9 Gland Steel STM -8 Grade II Disc Steel (Stellited) SM S-82 Grade F 2 Split Gland ushing Stainless Steel Type Disc Nut Stainless Steel Type Stuffing ox ushing Nickel lloy Ni-Resist No. 24 Yoke ushing ronze STM -37 lloy Stem Stainless Steel STM -582 Type olt Stainless Steel STM Handwheel Cast Iron STM Packing Flexible Graphite (Carbon raid nd Rings) 3 Disc Insert Stainless Steel (Heat Treated) ISI 40 Notes:. 600 psi and lower rated valve; SM S-26 Gr. WC psi and lower rated valve; Naval rass psi and lower rated valve; SM S Copyright 09 Tyco Flow Control. ll rights reserved. YWMC-0404
12 Dimensions and Weights (see pages 3-6 for Drawing References) Press. low-off Figure Size Dimensions Stem C v Wt. Rating (max. psi) No. (in.) D G H K L M P (lb.) Class (closed) (closed) /6 5 /2 2 3 / /8 /2 0 5 /8 6 7 /6 8 3 /8 3 /32 5 / /2 5 3 /6 5 /2 3 / /8 /2 0 5 /8 6 7 /6 8 3 /8 /2 5 / /6 5 5 /6 3 3 / /8 5 /8 2 5 /6 8 /2 9 3 /8 5 /6 3 / /2 7 /6 7 / /8 4 /6 2 3 /4 2 /2 / /4 7 /8 4 7 /8 /6 8 3 /8 0 5 /8 5 3 /8 8 3 /8 5/ /2 5 /2 5 3 /6 6 /8 3/6 8 3 /8 0 5 /8 6 /8 8 3 /8 /2 5/ /6 5 9 /6 6 /2 7 /8 9 3 /8 2 5 /6 8 /8 9 3 /8 2 3 / /2 6 /6 6 /6 7 /2 4 /6 2 3 /8 2 /2 / /8 5 / /4 /2 9 3 /8 4 /4 6 5/ /2 5 3 /6 7 / /4 /2 0 5 /8 6 7 /6 /2 /2 5 / /6 8 7 /8 3 3 / /2 5 /8 2 5 /6 8 /2 /2 2 3 / /2 7 /6 0 7 / /6 5 /8 4 /6 2 3 /4 /2 2 /2 / /8 5 /2 4 7 /8 /6 8 3 /4 9 3 /8 4 /4 6 5 / /2 5 3 /6 7 /8 6 /8 3 /6 7 /4 0 5 /8 6 7 /6 /2 /2 5 / /6 8 7 /8 6 /2 7 /8 8 /2 2 5 /6 8 /2 /2 2 3 / /2 7 /6 0 7 /8 7 /2 9 5 /6 4 /6 2 3 /4 /2 2 /2 / /8 5 / /2 9 3 /8 4 /4 6 5 / /2 5 3 /6 7 / /2 0 5 /8 6 7 /6 /2 /2 5 / /6 8 7 /8 3 3 / /8 2 5 /6 8 /2 /2 2 3 / /2 7 /6 0 7 / /8 4 /6 2 3 /4 /2 2 /2 / /8 4 7 /8 /6 9 3 /8 4 /4 6 5 / /2 5 3 /6 6 /8 3 /6 0 5 /8 6 7 /6 /2 /2 5 / /6 6 /2 7 /8 2 5 /6 8 /2 /2 2 3 / /2 7 /6 7 /2 4 /6 2 3 /4 /2 2 /2 / /6 5 7 /8 3 /8 3 5 /8 8 5 /6 6 7/ /2 5 7 /8 7 /2 6 / /8 3 /8 / /8 8 /2 3 /4 9 / /6 4 /2 7 /8 / / /8 7 /8 9 / /6 4 /2 7 /8 / /2 3 5 /8 7 5 /8 6 7 / / /8.92 /2 6 /2 2 /2 3 /8 / / /8 9 / /6 4 /2 7 /8 / / / /8 9 / /6 4 /2 7 /8 / /4.33 /2 3 5 /8 7 5 /8 6 7 / / /6.92 /2 6 /2 2 /2 3 /8 / / /8 9 / /6 4 /2 7 /8 / /2 6 4 / /8 9 / /6 4 /2 7 /8 / Notes:. Hardseat-Seatless 2. Hardseat-Hardseat Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
13 Hardseat-Seatless Unit Tandem Valves G Dia. Lubrication Fitting Seatless Valve M Dia. P D H Hardseat Valve 3 K (Closed) L (Closed) Figure G Dia. Lubrication Fitting Seatless Valve M Dia. P R D /6 Hardseat Valve 3 K (Closed) L (Closed) Figure Note:. See page 3 Diameter of Raised Face (in Flange Dimensions table) for R dimensions. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
14 Hardseat-seatless Unit Tandem Valves G 3 /2 3 /2 Lubrication Fitting Seatless Valve M Dia. P R D /4 Hardseat Valve K (Closed) L (Closed) Figure Note:. See page 3 Diameter of Raised Face (in Flange Dimensions table) for R dimensions. G 3 /2 Lubrication Fitting 3 / Seatless Valve M Dia. P D H Hardseat Valve K (Closed) L (Closed) Figure Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
15 Hardseat-Hardseat Unit Tandem Valves / M Dia. P D H 6 3 K (Closed) L (Closed) Figure / M Dia. P D H K (Closed) L (Closed) Figure and Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
16 Hardseat-Hardseat Unit Tandem Valves / M Dia. P R D K (Closed) L (Closed) Figure L (Closed) / The C dimension for flanged and socketweld valves is pipe-inlet-to-pipe-outlet offset. C M Dia. PR D K (Closed) L (Closed) Figure Note:. See page 3 Diameter of Raised Face (in Flange Dimensions table) for R dimensions. Tyco Flow Control (TFC) provides the information herein in good faith but makes no representation as to its comprehensiveness or accuracy. This data sheet is intended only as a guide to TFC products and services. Individuals using this data sheet must exercise their independent judgment in evaluating product selection and determining product appropriateness for their particular purpose and system requirements. TFC MKS NO RPRSNTTIONS OR WRRNTIS, ITHR XPRSS OR IMPLID, INCLUDING WITHOUT LIMITTION NY WRRNTIS OF MRCHNTILITY OR FITNSS FOR PRTICULR PURPOS WITH RSPCT TO TH INFORMTION ST FORTH HRIN OR TH PRODUCT(S) TO WHICH TH INFORMTION RFRS. CCORDINGLY, TFC WILL NOT RSPONSIL FOR DMGS (OF NY KIND OR NTUR, INCLUDING INCIDNTL, DIRCT, INDIRCT, OR CONSQUNTIL DMGS) RSULTING FROM TH US OF OR RLINC UPON THIS INFORMTION. Patents and Patents Pending in the U.S.and foreign countries. Tyco reserves the right to change product designs and specifications without notice. ll registered trademarks are the property of their respective owners. Printed in the US. Copyright 09 Tyco Flow Control. ll rights reserved. YWMC
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