VB-7313 Series 1/2" to 2" Screwed NPT Three
Contents
1. Return Return Bypass Supply Supply Stem down flow through coil Stem up flow through coil Stem up flow through coil bypass Stem down flow through coil bypass Figure 5 Typical Piping for Control of Heating or Cooling Coil Valve System Pump A A ae as Bypass Return Figure 6 Typical Boiler Hot Water Reset lt Coil Balancing Cock ay Valve i Ye JA B BH From Other To Other Zones Zones Ya Balancing Return Cock Supply Figure 7 Typical Primary Secondary Piping CHECKOUT MAINTENANCE Water System Maintenance 10 1 Make sure the valve stem operates smoothly before installing the valve linkage and the actuator 2 If the stem does not operate smoothly it may indicate that the valve was twisted or crushed during installation or that the stem was bent by rough handling These conditions may require that the valve be replaced 3 After the piping is under pressure check the valve body and the connections for leaks 4 After the valve linkage and the actuator are installed check their operation a Drive the actuator and run the valve to the stem down position Make sure the linkage and valve stem move freely At the stem down position the valve should shut off the B port b Drive the actuator and valve to the stem up position Again the valve stem and linkage should op2. 26074 SPECIFICATIONS Table 1 Specifications Models Valve Body Series VB 7313 0 4 P Service Chilled or Hot Water Specifications Flow Characteristics Figure 1 Mixing Sizes 1 2 to 2 Type of End Fitting NPT Body Bronze Seat Bronze Valve Stem Stainless Steel Materials Plug Brass Packing Spring loaded TFE Disc None ANSI Pressure Class Figure 2 250 up to 400 psig below 150 F Allowable Control Media Temperature 20 to 281 F 7 to 138 C 35 psi 241 kPa Max for Normal Life Allowable Differential Pressure for Water refer to Cavitation Limitations on Valve Pressure Drop on page 6 VB 7313 0 4 2 VB 7313 0 4 4 VB 7313 0 4 6 VB 7313 0 4 8 VB 7313 0 4 9 VB 7313 0 4 10 VB 7313 0 4 11 a Do not apply above pressure rating to piping system 5 Maximum recommended differential pressure Do not exceed recommended differential pressure pressure drop or integrity of parts may be affected Exceeding maximum recommended differential pressure voids product warranty kys m h AP 100 kPa Cy k x 1 156 Close off Pressure Rating The close off pressure rating is dependent on the size of the valve valve linkage and actuator Consult the Siebe Environmental Controls Catalog F 25683 for close off ratings Spring Return Position of Valve Assembly For a valve assembly valve linkage and actuator to have a spring return position the actu
3. F 19069 for details Flow Characteristics Three way mixing valves are designed so that the flow from either of the inlet ports to the outlet is approximately linear which means the total flow from the outlet is almost constant over the stroke of the valve stem See Figure 1 for typical flow characteristics of VB 7313 series valve bodies 100 90 80 70 9 2 60 l 50 ke 2 40 E 30 20 A Port B Port lo 10 0 x z x x x x o O O Q QO O N T o co 2 Stem In Stroke Stem Out Figure 1 Typical Flow Characteristics Rangeability Rangeability is the ratio of rated flow to the minimum controllable flow through a valve For mixing valves control begins as soon as plug displacement allows flow Thus three way valve rangeability normally exceeds 500 1 which is the reciprocal of 0 2 nominal leakage Temperature Pressure Ratings See Figure 2 for temperature and pressure ratings Consult the appropriate valve linkage general instruction sheet for the effect of valve body ambient temperatures on specific actuators Ratings conform with published values and disclaimer VB 7313 0 4 P Screwed Cast Bronze Body Standards Pressure to ANSI B16 15 Class 250 with 400 psig up to 150 F decreasing to 321 psig at 281 F Materials Bronze ASTM B584 321 psig 2218 kPa 300 149 250 121 Maximum Flui
4. Invensys Building Systems 1354 Clifford Avenue Zip 61111 P O Box 2940 Loves Park IL 61132 2940 United States of America Application VB 7313 series three way mixing valves control hot or chilled water in heating or air conditioning systems These valves must be piped with two inlets A and B ports and one outlet AB port They are used for two position or proportional control applications Valve assemblies require an actuator and a valve linkage that must be purchased separately A Danger Do not use for combustible gas applications The VB 7313 series valve packings are not rated for combustible gas applications and if used in these applications gas leaks and explosions could result Features e Valve sizes 1 2 to 2 e 250 psig pressure rating per ANSI Standards B16 15 1985 for screwed cast bronze bodies Spring loaded TFE packing e American Standard Taper Pipe Thread NPT connections Applicable Literature Siebe Environmental Controls Catalog F 25683 e Siebe Environmental Controls Cross Reference Guide F 23638 e Siebe Environmental Controls Reference Manual F 21683 Siebe Environmental Controls Application Manual F 21335 Control Valve Sizing F 13755 e Valve Selection Chart for Water F 11080 EN 205 Water System Guidelines F 26080 Printed in U S A 9 97 VB 7313 Series 1 2 to 2 Screwed NPT Three Way Mixing Valves General Instructions F
5. ator must be of the spring return type See Table 2 for spring return position of valve assemblies Table 2 Required Compatible Actuators Linkages Actuator Series MA 318 MA 418 MA 419 Required Valve Linkage AV 391 Spring Return Position Stem Up or Down MA 5210 MA 5211 MA 5213 AV 7600 Stem Up MC 351 MC 431 MC 4311 MC5 4311 AV 393 None MF 5413 MF 5513 AV 7600 amp AV 601 Stem Up MF 22203 MF 22303 MF 22323 MF 63103 MF 63123 Included w Actuator None MK 2690 AV 7400 MK 4601 MK 4611 MK 4621 MK 6601 MK 6611 MK 6621 AV 401 AV 430 Stem Up MM 400 MMR 400 MM 500 MMR 500 AV 630 or AV 630 10 None Stem Up or Down MP 361 MP 461 600 MP 465 MP5 4651 MP 371 MP 471 600 MP 475 MP5 4751 AV 391 Stem Down Stem Up MP 381 MP 382 MP 481 600 MP 485 MP 486 MP 4851 MP5 4851 AV 393 None MP 5210 MP 5211 MP 5213 AV 7600 MP 5410 MP 5411 MP 5413 MP 5513 AV 7600 amp AV 601 Stem Up MPR 5610 MPR 5611 MPR 5613 MPR 5713 AV 7600 amp AV 601 Stem Up MS 22353 Included w Actuator None 3 Stem Up Flow port B to port AB Stem Down Flow port A to port AB b High ambient temperatures with high media temperatures in the valve may require the use of AV 601 in addition to AV 7600 See General Instructions for AV 7600 F 26235 and AV 601
6. d 200 93 Temperature 281 F 138 C 150 65 100 38 Minimum Fluid Temperature VB 7313 0 4 P 50 10 F 7 C 50 150 250 350 345 1034 1724 2458 345 100 500 300 400 689 1379 2068 2758 Temperature F C Pressure psig kPa Figure 2 Temperature and Pressure Ratings for VB 7313 Series Valve Bodies VALVE SIZING AND SELECTION Water Two position Two position control valves are normally selected line size to keep pressure drop at a minimum If it is desirable to reduce the valve below line size then 10 of available pressure that is the pump pressure differential available between supply and return mains with design flow at the valve location is normally used to select the valve Proportional to Bypass Flow Proportional valves used to bypass flow Figure 5 are piped on the outlet side of the load to throttle the water flow through the load and therefore control heat output of the load These valves are usually selected to take a pressure drop equal to at least 50 of the available pressure As available pressure is often difficult to calculate the normal procedure is to select the valve using a pressure drop at least equal to the drop in the coil or other load being controlled except where small booster pumps are used with a minimum recommended pressure drop of 5 psi 34 kPa When the design temperature drop
7. erate smoothly At the stem up position the valve should shut off the A port Regular maintenance of the total system is recommended to assure sustained performance See Table 7 for maintenance kit part numbers Table 7 Maintenance Kits for VB 7313 Valves Valve Body Replacement Part Number Packing Assembly VB 7313 0 4 2 RYB 731 2 VB 7313 0 4 4 RYB 731 4 VB 7313 0 4 6 RYB 731 6 VB 7313 0 4 8 YBA 622 1 TOOL 20 1 RYB 731 8 VB 7313 0 4 9 RYB 731 9 VB 7313 0 4 10 RYB 731 10 VB 7313 0 4 11 RYB 731 11 Packing Wrench Valve Repair Kit a Kit includes replacement packing and stem amp plug assembly All heating and cooling systems are susceptible to valve and system problems caused by improper water treatment and system storage procedures These guidelines are provided to help avoid valve and water system problems resulting from improperly treated water or storage procedures in cooling and hot water systems and to obtain maximum life from Siebe Environmental Controls valves Durability of valve stems and packings is dependent on maintaining non damaging water conditions Inadequate water treatment or filtration not in accordance with chemical supplier ASHRAE handbook recommendations can result in corrosion scale and abrasive particle formation Scale and particulates can result in stem and packing scratches and can adversely affect packing life and other parts of the hydronic system To
8. here C Coefficient of flow GPM U S gallons per minute 60 F 15 6 C AP Differential pressure in psi pressure drop Cavitation Limitations on Valve Pressure Drop Additional Valve Sizing Information A valve selected with too high a pressure drop can cause erosion of discs and or wire drawing of the seat In addition cavitation can cause noise damage to the valve trim and possibly the body and choke the flow through the valve Do not exceed the maximum differential pressure pressure drop for the valve selected The following formula can be used on higher temperature water systems where cavitation could be a problem to estimate the maximum allowable pressure drop across the valve Pm 0 5 P4 Pv Where Pm Maximum allowable pressure drop psi P Absolute inlet pressure psia Pv Absolute vapor pressure psia refer to Table 5 Note Add 14 7 psi to gauge supply pressure to obtain absolute pressure value For example if a valve is controlling 200 F water at an inlet pressure of 18 psig the maximum pressure drop allowable would be Pm 0 5 18 14 7 11 53 10 6 psi Vapor pressure of 200 F water is 11 53 psia If the pressure drop for this valve is less than 10 6 psi cavitation should not be a problem Systems where cavitation is shown to be a problem can sometimes be redesigned to provide lower inlet velocities Valves having harder seat materials should be furnished if in
9. is less than 60 F 33 C for conventional heating systems higher pressure drops across the valve are needed for good results Table 3 Table 3 Conventional Heating System Design Temperature Recommended Pressure Drop Multiplier on Load Drop F C of Available Pressure Load Drop 60 33 or More 1 x Load Drop 40 22 2 x Load Drop 20 11 3 x Load Drop a Recommended minimum pressure drop 5 psi 34 kPa Secondary Circuits with Small Booster Pumps 50 of available pressure difference equal to the drop through load or 50 of booster pump head Proportional to Blend Water Flows Proportional valves used to blend two water flows Figure 6 and Figure 7 control the heat output by varying the water temperature to the load at constant flow These valves do not require high pressure drops for good control results They can be sized for a pressure drop of 20 of the available pressure or equal to 25 of the pressure drop through the load at full flow Water Capacity See Table 4 for water capacity of VB 7313 series valves Table 4 Water Capacity in Gallons Per Minute for VB 7313 Series Valve Body Part Number VB 7313 0 4 2 Differential Pressure AP in psi 6 7 8 9 VB 7313 0 4 4 VB 7313 0 4 6 VB 7313 0 4 8 VB 7313 0 4 9 VB 7313 0 4 10 VB 7313 0 4 11 C Equation GPM GPM 2 Cy aP _ GPM C VAP VAP Cy W
10. let velocities cannot be lowered Table 5 Vapor Pressure of Water Table Vapor Water Vapor Water Vapor Water Vapor Pressure Temp Pressure Temp Pressure Temp Pressure F psia psia CF psia CF psia For additional valve sizing information see e CA 28 Control Valve Sizing F 13755 e Valve Selection Chart Water F 11080 e Valve Sizing Slide Rule TOOL 150 INSTALLATION Inspection Requirements Mounting Inspect the package for damage If damaged notify the appropriate carrier immediately If undamaged open the package and inspect the device for obvious damage Return damaged products Tools not provided Pipe wrenches Training Installer must be a qualified experienced technician Appropriate accessories Caution Install the valve with the flow in the direction of the flow arrows A and B ports are inlets and AB port is the outlet Do not exceed the ratings of the device Avoid locations where excessive moisture corrosive fumes or vibration are present 3 The valve should be mounted in a weather protected area in a location that is within the ambient limits of the actuator When selecting a location allow sufficient room for valve linkage actuator and other accessories and for service of the product The preferred mounting position for the valve is with the valve stem vertical above the valve body Avoid mounting the valve so that the valve s
11. maintain non damaging conditions follow these guidelines e Clean the system prior to start up Use a nitrite or molybdate based treatment program e Use filtration equipment where needed e Properly store off line systems and monitor water treatment results using corrosion test coupons e Follow the advice of a water treatment professional e Consult EN 205 Water System Guidelines Engineering Information F 26080 for further details DIMENSIONAL DATA Table 8 Dimensions for VB 7313 Series Valves Figure 8 Dimensions in Inches mm Part Valve Number Size B c D E Stem Down Stroke VB 7313 0 4 2 4 2 3 1716 78 1 3 8 35 VB 7313 0 4 4 ve ve 35 1 11 16 43 VB 7313 0 4 6 3 4 3 5 8 92 1 11 16 43 VB 7313 0 4 8 1 1 9 16 40 1 3 4 45 4 5 8 118 40 45 3 4 19 7 16 11 VB 7313 0 4 9 1 5 8 41 2 51 VB 7313 0 4 10 5 3 8 137 1 9 16 40 1 1 8 29 VB 7313 0 4 11 6 1 8 156 1 7 8 48 1 3 16 30 Y E A i D Y i c A A gt B A te 3 A Figure 8 Typical of VB 7313 0 4 P Valve Bodies 11 F 26074 BK Specifications may change as design improvements are introduced Printed in U S A
12. tem is below horizontal The valves must be piped with two inlets A and B ports and one outlet AB port Screwed Valve Bodies The VB 7313 0 4 P series screwed valve bodies conform to American Standard Taper Pipe Threads NPT 1 Apply pipe dope sparingly to all but the last two threads of a properly threaded reamed and cleaned pipe Make sure that pipe chips scale etc do not get into the pipe since this material may lodge in the valve seat and prevent proper closing and opening of the valve Start the joint by hand screwing the pipe into the valve If the thread engagement feels right turn the pipe by hand as far as it will go Use a pipe wrench to fully tighten the valve to the pipe Do not over tighten or strip threads SeeTable 6 and Figure 3 for the normal engagement length of the threads Figure 4 shows a means of tightening the pipe so that the valve is not twisted or crushed Table 6 Normal Thread Engagement Between Male Pipe Thread and Valve Body 1 2 11 16 9 16 11 16 11 16 3 4 Pipe threads too long Pipe interferes with seat Figure 3 Normal Thread Engagement Valve Assembly Tighten pipe using this pipe wrench v Use pipe wrench to prevent valve from turning Figure 4 Installation of Screwed End Valves TYPICAL PIPING All piping must comply with local codes and ordinances Refer to Figure 5 through Figure 7 for typical piping
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