VB-7253 Series. Application. Features. Applicable Literature

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1 VB-7253 Series 1/2 to 2 Screwed NPT Stinless Steel Trim with Teflon Disc Stem Up Open, Two-Wy Vlves Generl Instructions Appliction VB-7253 series single set, stem down to close, two wy vlves control wter from 20 to 340 F (-7 to 171 C) or stem to 340 F (171 C) mx. in heting or ir conditioning systems. These vlves hve stinless steel trim with Teflon disc. They re used for two-position or proportionl control pplictions. Vlve ssemblies require n ctutor nd vlve linkge tht must be purchsed seprtely. Dnger: Do not use for combustible gs pplictions. The VB 7253 series vlve pckings re not rted for combustible gs pplictions, nd if used in these pplictions, gs leks nd explosions could result. Fetures Vlve sizes 1/2 to psig pressure rting per ANSI Stndrds (B ) Spring-loded TFE pcking Americn Stndrd Tper Pipe Thred (NPT) connections Stinless steel set nd Teflon disc Applicble Literture Vlve Products Ctlog, F Cross-Reference Guide, F Reference Mnul, F Appliction Mnul, F Control Vlve Sizing, F Vlve Selection Chrt for Stem, F Vlve Selection Chrt for Wter, F EN-205 Wter System Guidelines, F-26080

2 SPECIFICATIONS 2 Tble-1 Specifictions/Models. Service Specifictions Flow Chrcteristics (Figure 1) Action Hot Wter nd Stem Throttling Stem Up Open Sizes 1/2 to 2 Type of End Fitting Vlve Mterils ANSI Pressure Clss (Figure 2) Mximum Inlet Pressure, Stem Body Set Stem Plug Pcking Disc Allowble Control Medi Temperture NPT Bronze Stinless Steel Stinless Steel Stinless Steel Spring-loded TFE Teflon Vlve Body Series VB P 250 (up to 400 psig below 150 F) 100 psig (690 kp) 20 to 340 F (-7 to 171 C) 35 psi (241 kp) Mx. for Norml Life Allowble Differentil Pressure for Wter (refer to Cvittion Limittions on Vlve Pressure Drop on pge 1) Allowble Differentil Pressure for Stem 35 psi (241 kp) Vlve Size Rting k vs Rting b Complete Vlve Body VB / VB VB VB / VB VB VB VB / VB / VB VB Mximum recommended differentil pressure in open position. Do not exceed recommended differentil pressure (pressure drop) or integrity of prts my be ffected. Exceeding mximum recommended differentil pressure voids product wrrnty. b k vs = m 3 /h ( P = 100 kp) = k vs x Close-off Pressure Rting The close-off pressure rting is dependent on the size of the vlve, vlve linkge, nd ctutor. Consult the Vlve Products Ctlog, F-27384, for close-off rtings.

3 Norml Position of Vlve Assembly For vlve ssembly (vlve, linkge, nd ctutor) to hve norml (spring return) position, the ctutor must be of the spring return type. See Tble 2 for norml position of vlve ssemblies. Tble-2 Required Comptible Actutors/Linkges. Actutor Series Required Vlve Linkge Norml Position MA-318, MA-418, MA-419 AV-391 N.O. or N.C. MA-5210, MA-5211, MA-5213 AV-7600 Normlly Open MC-351, MC-431, MC-4311, MC AV-393 None MF-5413, MF-5513 AV-7600 & AV-601 Normlly Open MF-22203, MF-22303, MF Included w/actutor None MK-2690 AV-7400 MK-4601, MK-4611, MK-4621 AV-401 Normlly Open MK-6601, MK-6611, MK-6621 AV-430 MM-400, MMR-400 None AV-630 MM-500, MMR-500 N.O. or N.C. MP-361, MP-461, MP-465, MP Normlly Closed AV-391 MP-371, MP-471, MP-475, MP Normlly Open MP-381, MP-382, MP-481, MP-485, MP-486, MP-4851, MP AV-393 None MP-5210, MP-5211, MP-5213 AV-7600* MP-5410, MP-5411, MP-5413 MP-5513 Normlly Open AV-7600 & AV-601 MPR-5610, MPR-5611, MPR-5613 MPR-5713 MS Included w/actutor None High mbient tempertures with high medi tempertures in the vlve my require the use of AV-601 in ddition to AV See Generl Instructions for AV-7600 (F-26235) nd AV-601 (F-19069) for detils. 3 Flow Chrcteristics These vlves hve throttle with modified equl percentge flow chrcteristics. The chnge of flow rte with respect to vlve stroke is reltively smll when the vlve plug is ner the vlve set. See Figure 1 for typicl modified equl percentge flow chrcteristics of VB 7253 series vlve bodies. 100% 90% 80% 70% Flow 60% 50% 40% 30% 20% 10% 0% 0% Closed 10% 20% 30% 40% 50% Stroke 60% 70% 80% 90% 100% Open Figure-1 Typicl Modified Equl Percentge Flow Chrcteristics.

4 Rngebility 4 Rngebility is the rtio of rted flow to the minimum controllble flow through vlve. Tble 3 lists the rngebility for VB-7253 series vlves. Tble-3 Rngebility. Vlve Body Nominl Rngebility Vlve Body Nominl Rngebility VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 VB :1 Temperture/Pressure Rtings See Figure 2 for temperture nd pressure rtings. Consult the pproprite vlve linkge generl instruction sheet for the effect of vlve body mbient tempertures on specific ctutors. Rtings conform with published vlues nd disclimer. VB P (Screwed Cst Bronze Body) Stndrds: Pressure to ANSI B16.15 Clss 250 with 400 psig up to 150 F Mterils: Bronze, ASTM B (176) 310 psig (2137 kp) Temperture F ( C) 300 (149) 250 (121) 200 (93) 150 (65) 100 (38) 50 (10) Mximum Medi Temperture 340 F (171 C) Minimum Fluid Temperture 20 F (-7 C) VB P 50 (345) 100 (689) 150 (1034) 200 (1379) 250 (1724) 300 (2068) Pressure psig (kp) 350 (2458) 400 (2758) VALVE SIZING AND SELECTION Wter Figure-2 Temperture nd Pressure Rtings for VB-7253 Series Vlve Bodies. Two-position Two-position control vlves re normlly selected line size to keep pressure drop t minimum. If it is desirble to reduce the vlve below line size, then 10% of vilble pressure (tht is, the pump pressure differentil vilble between supply nd return mins with design flow t the vlve loction) is normlly used to select the vlve. Proportionl Proportionl control vlves re usully selected to tke pressure drop equl to t lest 50% of the vilble pressure. As vilble pressure is often difficult to clculte, the norml procedure is to select the vlve using pressure drop t lest equl to the drop in the coil or other lod being controlled (except where smll booster pumps re used) with minimum recommended pressure drop of 5 psi (34 kp). When the design temperture drop is less thn 60 F (33 C) for conventionl heting systems, higher pressure drops cross the vlve re needed for good results (Tble 4).

5 Tble-4 Conventionl Heting System. 5 Design Temperture Lod Drop F ( C) Recommended Pressure Drop (% of Avilble Pressure) Multiplier on Lod Drop 60 (33) or More 50% 1 x Lod Drop 40 (22) 66% 2 x Lod Drop 20 (11) 75% 3 x Lod Drop Recommended minimum pressure drop = 5 psi (34 kp). Secondry Circuits with Smll Booster Pumps:13 50% of vilble pressure difference (equl to the drop through lod, or 50% of booster pump hed). Wter Cpcity See Tble 5 for wter cpcity of VB-7253 series vlves. Tble-5 Wter Cpcity in Gllons Per Minute for VB-7253 Series. Vlve Body Differentil Pressure (DP in psi) Rting VB VB VB VB VB VB VB VB VB VB VB Eqution = GPM P = P GPM 2 ( ) GPM = P Where: = Coefficient of flow GPM = U.S. gllons per minute (60 F, 15.6 C) P = Differentil pressure in psi (pressure drop) Stem Two-position Two-position zone vlves nd direct rdition vlves re normlly sized using minimum of 10% of inlet pressure (psig). Proportionl Proportionl control vlves re normlly sized using: For low pressure (15 psig or less), use DP of 80% of guge inlet pressure. For stem pressures greter thn 15 psig, use DP of 42% of bsolute (guge plus 14.7) inlet pressure. When the required is between two vlve sizes, select the lrger size. Do not size stem vlves using pressure drop greter thn 42% of the bsolute inlet pressure. Stem Cpcity See Tble-6 for stem cpcity of VB-7253 series vlves.

6 Tble-6 Stem Cpcity in Pounds Per Hour for VB-7253 Series. 6 Vlve Body Rting Differentil Pressure (DP in psi) 2 psig Inlet 5 psig Inlet 10 psig Inlet 15 psig Inlet 20 psig Inlet 25 psig Inlet VB VB VB VB VB VB VB VB VB VB VB Vlve Body Rting Differentil Pressure (DP in psi) 30 psig Inlet 35 psig Inlet 40 psig Inlet 50 psig Inlet 75 psig Inlet 100 psig Inlet VB VB VB VB VB VB VB VB VB VB VB Vlues re for sturted stem (K = 1). Left column under ech inlet pressure is for two-position control, nd right column is for proportionl control. Eqution QK = 3 P P2 Q = 3 P P2 K Where: = Coefficient of flow Q = Lbs. per hour of stem P = Differentil pressure in psi (pressure drop) P2 = Outlet pressure in psi (bsolute) (P2 = Inlet pressure P) K = 1 + ( x F superhet) (K = 1 for sturted stem) Cvittion Limittions on Vlve Pressure Drop A vlve selected with too high pressure drop cn cuse erosion of discs nd/or wire drwing of the set. In ddition, cvittion cn cuse noise, dmge to the vlve trim (nd possibly the body), nd choke the flow through the vlve. Do not exceed the mximum differentil pressure (pressure drop) for the vlve selected. The following formul cn be used on higher temperture wter systems, where cvittion could be problem, to estimte the mximum llowble pressure drop cross the vlve: Pm = 0.5 (P 1 Pv) Where: Pm = Mximum llowble pressure drop (psi) P 1 = Absolute inlet pressure (psi) Pv = Absolute vpor pressure (psi) (refer to Tble 6 or Tble 7) Note: Add 14.7 psi to guge supply pressure to obtin bsolute pressure vlue.

7 7 For exmple, if vlve is controlling 200 F wter t n inlet pressure of 18 psig, the mximum pressure drop llowble would be: Pm = 0.5 [( ) 11.53] = 10.6 psi (Vpor pressure of 200 F wter is psi.) If the pressure drop for this vlve is less thn 10.6 psi, cvittion should not be problem. Systems where cvittion is shown to be problem cn sometimes be redesigned to provide lower inlet velocities. Tble-7 Vpor Pressure of Wter Tble. Wter Temp. ( F) Vpor Pressure (psi) Wter Temp. ( F) Vpor Pressure (psi) Wter Temp. ( F) Vpor Pressure (psi) Wter Temp. ( F) Vpor Pressure (psi) Additionl Vlve Sizing Informtion For dditionl vlve sizing informtion, see: CA-28 Control Vlve Sizing, F Vlve Selection Chrt Wter, F Vlve Selection Chrt Stem, F Vlve Sizing Slide Rule, TOOL-150

8 INSTALLATION 8 Inspection Requirements Inspect the pckge for dmge. If dmged, notify the pproprite crrier immeditely. If undmged, open the pckge nd inspect the device for obvious dmge. Return dmged products. Tools (not provided): Pipe wrenches Trining: Instller must be qulified, experienced technicin Approprite ccessories Cution: Instll the vlve with the flow in the direction of the flow rrow ( A port is the inlet nd AB port is the outlet). Do not exceed the rtings of the device. Avoid loctions where excessive moisture, corrosive fumes, or vibrtion re present. Mounting 1. The vlve should be mounted in wether-protected re in loction tht is within the mbient limits of the ctutor. When selecting loction, llow sufficient room for vlve linkge, ctutor, nd other ccessories nd for service of the product. 2. The preferred mounting position for the vlve is with the vlve stem verticl bove the vlve body. Avoid mounting the vlve so tht the vlve stem is below horizontl. 3. On stem pplictions where the mbient temperture pproches the limit of the ctutor, the vlve stem should be mounted 45 from verticl. 4. The VB series screwed vlve bodies conform to Americn Stndrd Tper Pipe Threds (NPT). The vlves must be piped with the A port s the inlet nd the AB port s the outlet. 5. Apply pipe dope springly to ll but the lst two threds of properly threded, remed, nd clened pipe. Mke sure tht pipe chips, scle, etc. do not get into the pipe since this mteril my lodge in the vlve set nd prevent proper closing nd opening of the vlve. 6. Strt the joint by hnd screwing the pipe into the vlve. If the thred enggement feels right, turn the pipe by hnd s fr s it will go. 7. Use pipe wrench to fully tighten the vlve to the pipe. Do not over tighten or strip threds. See Tble-8 nd Figure 3 for the norml enggement length of the threds. Figure 4 shows mens of tightening the pipe so tht the vlve is not twisted or crushed. Tble-8 Norml Thred Enggement Between Mle Pipe Thred nd Vlve Body. Vlve Size Inches (NPT) Norml Enggement Vlve Size Inches (NPT) Norml Enggement 1/2 1/2 1-1/4 11/16 3/4 9/16 1-1/2 11/ /16 2 3/4 Pipe threds too long. Pipe interferes with set. Wrong Right Figure-3 Norml Thred Enggement.

9 9 Vlve Assembly Tighten pipe using this pipe wrench. Use pipe wrench to prevent vlve from turning. Figure-4 Instlltion of Screwed End Vlves. CHECKOUT 1. Mke sure the vlve stem opertes smoothly before instlling the vlve linkge nd the ctutor. 2. If the stem does not operte smoothly, it my indicte tht the vlve ws twisted or crushed during instlltion or tht the stem ws bent by rough hndling. These conditions my require tht the vlve be replced. 3. After the piping is under pressure, check the vlve body nd the connections for leks. 4. After the vlve linkge nd the ctutor re instlled, check their opertion. MAINTENANCE & FIELD REPAIR Tble-9 Mintennce Kits for VB-7253 Vlves. Vlve Body Replcement Pcking Assembly Regulr mintennce of the totl system is recommended to ssure sustined performnce. See Tble 9 for mintennce kit prt numbers. Pcking Wrench Set Replcement Tool Size in inches (mm) Stinless Steel Set Vlve Repir Kit b VB RYB VB RYB TOOL /2 (15) NYBA VB RYB VB RYB VB RYB TOOL /4 (20) NYBA VB YBA TOOL-20-1 RYB VB RYB TOOL (25) NYBA VB RYB VB TOOL /4 (32) NYBA RYB VB TOOL /2 (38) NYBA RYB VB TOOL (50) NYBA RYB All six tool sizes re included in pckge. Refer to TOOL-7253 Series Stinless Steel Trim Vlve Set Replcement Tool Generl Instructions, F-26387, for detils. Stinless steel vlve replcement sets re sold seprtely. b Kit includes replcement pcking nd stem & plug ssembly.

10 Wter System Mintennce All heting nd cooling systems re susceptible to vlve nd system problems cused by improper wter tretment nd system storge procedures. These guidelines re provided to help void vlve nd wter system problems resulting from improperly treted wter or storge procedures in cooling nd hot wter systems, nd to obtin mximum life from Schneider Electric vlves. Durbility of vlve stems nd pckings is dependent on mintining non-dmging wter conditions. Indequte wter tretment or filtrtion, not in ccordnce with chemicl supplier/ashrae hndbook recommendtions, cn result in corrosion, scle, nd brsive prticle formtion. Scle nd prticultes cn result in stem nd pcking scrtches nd cn dversely ffect pcking life nd other prts of the hydronic system. To mintin non-dmging conditions, follow these guidelines: Clen the system prior to strt up. Use nitrite or molybdte-bsed tretment progrm. Use filtrtion equipment where needed. Properly store off-line systems nd monitor wter tretment results using corrosion test coupons. Follow the dvice of wter tretment professionl. Consult EN-205, Wter System Guidelines Engineering Informtion, F-26080, for further detils. DIMENSIONAL DATA Tble-10 Dimensions for VB-7253 Series Vlves (Figure 5). Prt Number Vlve Size Dimensions in Inches (mm) D A B C (Stem Down) VB VB /2 3-1/16 (78) VB VB /4 (32) 1-11/16 (43) VB VB /4 3-5/8 (92) VB /8 (29) VB /8 (118) 2-3/8 (60) VB /4 1-3/8 (35) VB /2 5-3/8 (137) 1-1/2 (38) 2-7/16 (57) VB /8 (156) 1-9/16 (40) 2-3/4 (70) Add up to 1/16 in. (1.6 mm) for disc seting nd compression. E (Stroke) 3/4 (19) 7/16 (11) E D C A Figure-5 Typicl of VB P Vlve Bodies. B 2014 Schneider Electric. All rights reserved.

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