Check Valves Brochure

Schutte & Koerting • 2510 Metropolitan Drive • Trevose, PA 19053 • USA • tel: (215) 639-0900 • fax: (215) 639-1597 • www.s-k.com • sales@s-k.com 1check ValvesBulletin 8K• Protect equiPment from backflowdamage in steam and water lines• raPid automatic closure in resPonse toback flow or actuator controlledclosure to allow two- way flow• Variety of configurations aVailable tomeet critical aPPlication requirementsdescriptionSchutte & Koerting Check Valves prevent backflowin steam and water lines to protect valuableequipment from damage.Used in extraction lines from steam turbines tofeedwater heaters, heating systems or processequipment, these valves are engineered forexceptional reliability.Under normal flow conditions, a counterbalanceweight holds the disc in position for free flow ofsteam or water. However, the slightest back flow willcause the disc to close tightly against the seat,preventing reverse flow through the valve.Where reverse flow is desired, the valves can beconfigured to remain open until closed by a cylinderactuator on signal.S&K check valves are available in a variety ofconfigurations for suitability to your applicationrequirements. In addition, they can bemanufactured with soft packing, hardened leak-offbushings, and various materials for criticalapplications.Complete physical testing offered by S&K includeshydrostatic and pneumatic testing as well asmagnetic particle (magnaflux) and radiographic (x-ray) inspection. All models are ANSI rated.The basic Type 828 Check Valve protects againstback flow of steam or water. The weight linked tothe disc provides a delicate counterbalance to theweight of the disc itself. With normal flow in theproper direction the disc swings open to permit fullflow. The slightest back flow will close the disctightly against the seat, preventing reverse flowthrough the valve.In applications where a controlled reverse flow isdesired, these valves can be arranged to remainopen until closed by a cylinder actuator on signal.Typical “hold open” arrangements are described onpage 3.In other applications these valves have beenequipped with a spindle to act as both a stop andcheck valve.Schutte & Koerting • 2510 Metropolitan Drive • Trevose, PA 19053 • USA • tel: (215) 639-0900 • fax: (215) 639-1597 • www.s-k.com • sales@s-k.com2check Valves Bulletin 8Kdesign featuressimple on-line maintenance.S&K check valves are designed to permit full access tointernal components without removal from the pipeline.This can reduce maintenance and inspection costsconsiderably.reduced distortion.Because S&K valves have a vertical seat, welding endscan be as long as needed without interfering with the useof a boring bar during finishing operations. This helpsprevent distortion of the seat areas during welding andheat treating. The ends are located at least one pipediameter away from the body proper in valves up to 4inches, and up to 8 inches away in larger sizes.basic configuration andcomPonents of standard ValVebodyconfiguration optionsSchutte & Koerting offers check valves in avariety of standard configurations tomaximize application versatility and meetspecial service conditions. Theconfigurations described are just thebeginning of the tremendous versatilityoffered by S&K. Many of our customerscount on us to apply our customapplication engineering to meet thespecific requirements of the installation.Boring BarUnlimitedBoring BarLimitedS&K ValveOther ValvesGasket CoverBodyTail LinkAnti-RotationPinDisc SeatStuffingBoxSealRingGlandDisc WeightRockshaft ShaftBearingGasketdesign featuresrapid closure in response to backflow.The S&K check valve is designed to permit full flow whenopen only 55° from vertical (below). This disc positionmakes the valve far more sensitive to backflow andresults in faster closing than possible with other designs.low pressure drop.The unique full-flow disc position described above,together with the straight-line flow characteristics of itsglobe-shaped body, produce minimal pressure dropthrough the valve.minimal valve binding.Rockshafts are made of stainless steel with bushings ofMonel. Freezing or binding is far less likely to occur thanin valves using less corrosion-resistant materials. Whenintended for service in vacuum lines, rockshafts areprovided with water seal lanterns.S&K Valve Other DesignSchutte & Koerting • 2510 Metropolitan Drive • Trevose, PA 19053 • USA • tel: (215) 639-0900 • fax: (215) 639-1597 • www.s-k.com • sales@s-k.com 3Bulletin 8Kcheck Valvesbasic check Valve• For low-pressure (up to 300 lbs. ANSI) applications.• Designed to reduce packing friction on the shaft.• Raised face flange with a confined spiral-wound gasket at the cover and rockshaft retainers.through-spindle design• For high-pressure (over 300 lb. ANSI) applications.• “Through sprindle” arrangement balances the higher stem thrusts of theseapplications.controlled reverse flow• Valve remains open for bi-directional flowuntil closed by an actuator.• In low-pressure (under 300 lbs. ANSI)applications (below left), the disc is held inplace until closed by the actuator, which canbe direct-connected.• In high-pressure applications (above right),the keyway is enlarged to allow the disc toswing freely until closed by the actuator.cylinder closure assist• Oil- or air-operated cylinder providesadditional safety measure to ensure positiveclosure in critical applications.• Disc swings freely until pressure fails.• Cylinder supplies initial impact to therockshaft and disc to overcome freezing inthe open position.• Can be mounted on either side of the valve.Pilot and relay Valves• For use with the oil- or air-operatedcylinders.• Can be used for hand-operated pilot andrelay services.• Available in both straight-through and three-way bodies in sizes from 1/4” to 3” withthreaded or flanged connections.standard body designsCylinderPistonSpringSpring CaseO-RingCylinderStemSlotted LinkLeverHand WheelAluminumSpindleType 410Stainless SteelLantern RingCast AluminumBronzePackingTo Suit ServicePacking RingMonel orNitrided SteelValve Stem GlandCast BrassYokeASTM A216 WCBMotor OperatedSchutte & Koerting • 2510 Metropolitan Drive • Trevose, PA 19053 • USA • tel: (215) 639-0900 • fax: (215) 639-1597 • www.s-k.com • sales@s-k.com4check Valves Bulletin 8K120712sizeno.d i m e n s i o n s1 weld.ends2f l a n g e s a n s i s t d .approx.wgt. lls.kfactor3a b c d e f g H150#H300#H400#H600#3 10 1/8 4 1/8 15 1/8 3 3/4 7 3/4 - 14 11 12 13 13 1/2 190 0.7924 10 5/8 4 5/8 14 1/2 4 1/4 8 1/2 - 16 13 14 16 17 230 0.7595 15 3/8 6 19 1/8 5 10 1/4 11 1/2 17 1/2 15 16 18 20 340 0.7316 15 3/8 6 18 1/2 5 3/4 11 1/8 16 5/8 19 16 17 19 1/2 22 500 0.7108 16 5/8 7 1/4 17 3/8 7 3/8 13 3/4 17 3/4 21 1/2 18 20 23 1/2 26 650 0.67510 18 3/8 9 16 1/2 9 1/4 14 20 1/8 24 1/2 22 23 26 1/2 31 780 0.64812 19 7/8 10 1/4 15 1/4 10 1/4 17 21 1/2 28 24 26 30 33 950 0.62714 20 13/16 11 23 9/16 11 5/8 18 13/16 25 3/8 32 1/2 28 30 31 32 1800 0.60816 24 1/4 14 1/4 22 12 3/4 20 1/4 32 36 30 33 38 39 1900 0.59218 24 1/4 14 1/4 21 1/4 13 11/16 22 1/8 32 3/4 40 34 1/2 36 37 39 2000 0.57920 27 17 19 1/2 16 1/8 24 1/2 34 1/2 44 36 39 43 1/2 47 3600 0.56524 31 11/16 21 3/4 17 1/4 18 27 7/8 36 3/4 50 44 45 46 48 4500 0.54330 36 1/4 26 1/4 17 1/4 22 34 5/8 41 61 52 55 57 59 7600 0.5181. All dimensions are in inches.2. For pipe schedules 20, 40, and 60. For pipe schedules 80, 100, and 120, contact the company.3. For determining pressure drop. Refer to engineering data for instructions on how to calculate pressure drop.S&K check valves conform to ANSI ratings, B16.5.sPecificationsA BEDCGHFC14 3/16”31”29”50 3/4”4”24”9 1/4”ISO9001Certified