T.A.C. VB-7213 User Guide

Page 1

Application

VB-7213 series single seat, stem up open, two-way valves control water from 20 to 281°F (-7 to 138°C) or steam to 281°F (138°C) maximum in heating or air conditioning systems. They are used for two-position or proportional control applications. Valve assemblies require an actuator and a valve linkage. A large selection of factory assembled combinations is available. Consult the TAC Valve Products Catalog, F-27384.

VB-7213 Series

1/2" to 2" Screwed NPT

Stem Up Open, Two-Way Valves

General Instructions

Danger:

The VB-7213 series valve packings are not rated for combustible gas applications, and if used in these applications, gas leaks and explosions could result.

Do not use for combustible gas applications.

Features

• Valve sizes 1/2" to 2"

• 250 psig pressure rating per ANSI Standards

(B16.15–1985) for screwed cast bronze bodies

• Spring-loaded TFE packing

• American Standard Taper Pipe Thread (NPT)

connections

Applicable Literature

• TAC Valve Products Catalog, F-27384

• TAC Cross-Reference Guide, F-23638

• TAC Reference Manual, F-21683

• TAC Application Manual, F-21335

• Control Valve Sizing, F-13755

• Valve Selection Chart for Steam, F-11366

• Valve Selection Chart for Water, F-11080

• EN-205 Water System Guidelines, F-26080

Page 2

SPECIFICATIONS

Table-1 Specifications/Models.

Specifications

Valve Body Serie s

VB-7213-0-4-P

Service Chilled or Hot Water and Steam Flow Characteristics (Figure-1) Equal Percentage Action Stem Up Open Sizes 1/2" to 2" Type of End Fitting NPT

Body Bronze Seat Bronze

Valve

Materials

Stem S t ai nless Ste el Plug Brass Packing Spring-load ed TFE Disc EPDM

ANSI Pressure Class (Figure-2) 250 (up to 400 psig below 150°F)

Maximum Inlet Pressure, Steam 35 psig (241 kPa) Allowable Control Media Temperature 20 to 281°F (-7 t o 138°C)

Allowable Differential Pressure for Water

35 psi (241 kPa) Max. for Normal Life (refer to “Cavitation Limita tions on Valve Pressure Drop” on pa ge 7)

Allowable Dif ferential Pressure for S team

Valve Size C

Rating kvs Rating

20 psi (138 kPa)

Complete Valve Body Part Number

0.4 0.3 VB-7213-0-4-1

1/2"

1.3 1.1 VB-7213-0-4-2

2.2 1.9 VB-7213-0-4-3

4.4 3.8 VB-7213-0-4-4

3/4"

5.5 4.8 VB-7213-0-4-5

7.5 6.5 VB-7213-0-4-6 10 8.7 VB-7213-0-4-7 14 12 VB-7213-0-4-8

1-1/4" 20 17 VB-7213-0-4-9 1-1/2" 28 24 VB-7213-0-4-10

2" 40 35 VB-7213-0-4-11

Do not apply above pressure rating to piping system.

Maximum recommended differential pressure in open position. Do not exceed recommended differential pressure (pressure drop) or integrity of parts may be affected. Exceeding maximum recommended differential pressure voids product warranty.

kvs = m3/h (ΔP = 100 kPa) Cv = kvs 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 TAC Valve Prodcuts Catalog, F-27384, for close- of f ratings.

Page 3

Normal Position of Valve Assembly

For a valve assembly (valve, link age, and actuator) to have a normal (spring ret urn) position, the actuator must be of the spring ret urn type. See Table-2 for spri ng return posit ion of valve assemblies.

Table-2 Required Compatible Actuators/Linkages.

Actuator Seri es Requi red Valve Linkage Normal Position

MA-318, MA-418, MA-419 AV-391 N.O. or N.C. MA-5210, MA-5211, MA-5213 AV-7600

MC-351, MC-431, MC-4311, MC5-4311 AV-393 None MF-5413, MF-5513 AV-7600 MF-22203, MF-22303, MF-22323 MF-63103, MF-63123

Included w/Actuator None

MK-2690 AV-7400

MK-6601, MK-6611, MK-6621 AV-430 MM-400, MMR-400 MM-500, MMR-500 N.O. or N.C. MP-361, MP-367, MP-465, MP5 -4651 MP-371, MP-377, MP-475, MP5-4751 Normally Open MP-381, MP-382, MP-387, MP-485,

MP-486, MP-4851, MP5-4851 MP-5210, MP-5211, MP-5213 AV-7600

AV-630 or

AV-630-010

AV-391

AV-393 None

MP-5410, MP-5411, MP-5413 MP-5513 MPR-5610, MPR-56 11, MPR-5 613

AV-7600 & AV-601

MPR-5713 MS-22353 Included w/Actuator None

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 (F-19069) for details.

Normally Open

Normally OpenMK-4601, MK-4611, MK-4621 AV-401

None

Normally Closed

Normally Open

Flow Characteristics

All valves have modifi ed equal perc entage flow char acterist ics. That is, for equa l increment s of valve stem str oke, t he change in f low rat e with res pect to val ve str oke may be ex pressed as a cons tant p ercent of t he flow rat e at the time o f the cha nge. The cha nge o f fl ow rat e wit h respect to val ve str oke is relativel y small when the valve plug is near the valve seat and relatively high when the valve plug is nearly wide open. See Figure-1 for typical modified equal percentage flow characterist ics of VB-7213 series val ve bodies.

100%

90% 80% 70% 60% 50%

Flow

40% 30% 20% 10%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Closed

Stroke

Open

Figure-1 Typical Modified Equal Percentage Flow Characterist ics.

Page 4

Rangeability

Rangeability is the ratio of rated flow to the minimum controllable flow t hrough a valve. Table-3 lists the rangeability for V B-7213 series valves.

Table-3 Rangeability.

Valve Bo dy

Part Number

VB-7213-0-4-1 5:1 VB-7213-0-4-7 60:1 VB-7213-0-4-2 15:1 VB-7213-0-4-8 75:1 VB-7213-0-4-3 25:1 VB-7213-0-4-9 75:1 VB-7213-0-4-4 40:1 VB-7213-0-4-10 75:1 VB-7213-0-4-5 50:1 VB-7213-0-4-11 75:1 VB-7213-0-4-6 60:1

Nominal

Rangeability

Valve Body

Part Number

Nominal

Rangeability

Temperature/Pressure Ratings

See Figure-2 for temperature and pressure ratings. Consult the appropriate valve linkage general inst ruction sheet for the eff ect of valve body ambient temperatures on specif ic actuators. Ratings conform with published values and disclaimer.

VB-7213-0-4-P (Screw ed Cast Bronze Body)

Standards:

321 psig at 281°F

Materials:

Pressure to ANSI B16.15 Class 250 with 400 psig up to 150°F decre asing to

Bronze, ASTM B584

321 psig

(2218 kPa) 300 (149) 250 (121)

200 (93)

150 (65)

100 (38)

Temperature — °F (°C)

50 (10)

Maximum Media

Temperature

281°F (138°C)

Minimum Fluid

Temperature

20°F (-7°C)

(345)

Figure-2 Temperature and Pre ssure Ratings

for VB-7213 Series Valve Bodies.

150

(1034)

100

(689)

200

(1379)

Pressure — psig (kPa)

VB-7213-0-4-P

250

(1724)

(2458)

300

(2068)

350

400

(2758)

Page 5

VALVE SIZING AND SELECTION Water Two-position

Two-position control valves are nor ma ll y selected “line si ze” to keep pressure drop at a minimum. If it is desi rable to reduce the val ve below line size, then 10% of “avai lable pressure” (that is, the pump pres sure differe ntial avai lable between suppl y and return mains with design flow at the valve location) is normally used to select the valve.

Proportional

Proportiona l contr ol valv es are us ually s elected t o take a pres sure drop equal t o at l east 5 0% 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 dro p in th e coil or other loa d being control led (except where small booster pumps ar e used) wit h a minimum recommended pressure drop of 5 psi (34 kPa). When the design temperature drop is less than 60°F (33°C) for conventi onal heat in g systems, higher pr essu re drops acr oss the val ve are needed for good res ults (Table-4).

Table-4 Conventional Heating System.

Design Temperature

Load Drop °F (°C)

60 (33) or More 50% 1 x Load Drop

40 (22) 66% 2 x Load Drop 20 (11) 75% 3 x Load Drop

Recommended minimum pressure drop = 5 psi (34 kPa).

Recommende d Pres su re Drop

(% of Availabl e Pressure)

Multiplier on

Load Drop

Secondary Circuits with Small Booster Pumps: 50% of available pressure difference

(equal to the drop through load, or 50% of booster pump head).

Water Capacity

See Table-5 for water capacity of VB-7213 series val ves.

Table-5 Water Capacity in Gallons Per Minute for VB-7213 Series.

Valve Body

Part Number

VB-7213-0-4-1 0.4 0.40 0.57 0.69 0.80 0.89 0.98 1.06 1.13 1.20 1.26 1.55 1.79 2.37 VB-7213-0-4-2 1.3 1.30 1.84 2.3 2.6 2.9 3.2 3.4 3.7 3.9 4.1 5.0 5.8 7.7 VB-7213-0-4-3 2.22.23.13.84.44.95.45.86.26.67.08.59.8 13 VB-7213-0-4-4 4.4 4.4 6.2 7.6 8.8 9.8 11 12 12 13 14 17 20 26 VB-7213-0-4-5 5.5 5.5 7.8 9.5 11 12 13 15 16 17 17 21 25 33 VB-7213-0-4-6 7.5 7.5 11 13 15 17 18 20 21 23 24 29 34 44 VB-7213-0-4-7 10 10 14 17 20 22 24 26 28 30 32 39 45 59 VB-7213-0-4-8 14 14 20 24 28 31 34 37 40 42 44 54 63 83 VB-7213-0-4-9 20 20 28 35 40 45 49 53 57 60 63 77 89 118 VB-7213-0-4-10 28 28 40 49 56 63 69 74 79 84 89 108 125 166 VB-7213-0-4-11 40 40 57 69 80 89 98 106 113 120 126 155 179 237

Rating

12345678910152035

Differential Pressure (

ΔP in psi)

Cv Equation

Cv=

GPM

ΔP

ΔP=

GPM

()

GPM = Cv ΔP

Where:

Cv= Coefficient of flow GPM = U.S. gallons per minute (60°F, 15.6°C)

ΔP = Differential pressure in psi (pressure drop)

Page 6

Steam Two-position

Two-position z one valves and direc t radiati on v alves are normal ly si zed using a mi nimum of 10% of inlet pressure (psig).

Proportional

Proportiona l control valves are norm ally sized using:

• For low pressure (15 psig or less), use ΔP of 80% of gauge inlet pressure.

• For steam pressur es greater than 15 psig, use ΔP of 42% of absolute (gauge plus 14.7)

inlet pres su r e .

• When the C

steam valves using a pressure drop greate r than 42% of the absolute inlet pressure.

Steam Capacity

See Table-6 for steam capacity of VB-7213 series valves.

Table-6 Steam Capacity in Pounds Per Hour for VB-7213 Series.

Valve Body

Part Number

VB-7213-0-4-1 0.4 2.2 5.9 3.7 9.5 5.8 13.9 7.8 17.5 9.7 20.4 11.6 23.4 13.4 26.3 15.3 29.2 VB-7213-0-4-2 1.3 7.1 19.2 12.1 30.9 19.0 45.1 25.4 56.8 31.5 66.4 37.6 75.9 43.6 85.5 49.6 95.1 VB-7213-0-4-3 2.2 12.0 32.4 20.4 52.3 32.1 76.3 42.9 96.2 53.4 112 63.6 129 73.8 145 83.9 161 VB-7213-0-4-4 4.4 24.0 64.9 40.9 105 64.3 153 85.9 192 107 225 127 257 148 289 168 322 VB-7213-0-4-5 5.5 30.0 81.1 51.1 131 80.3 191 107 240 133 281 159 321 185 362 210 402 VB-7213-0-4-6 7.5 40.9 111 69.7 178 110 260 146 328 182 383 217 438 252 493 286 548 VB-7213-0-4-7 10 54.5 147 93 238 146 347 195 437 243 511 289 584 336 658 381 731 VB-7213-0-4-8 14 76.3 206 130 333 204 485 273 612 340 715 405 818 470 921 534 1024 VB-7213-0-4-9 20 109 295 186 475 292 694 390 874 485 1021 579 1168 671 1315 763 1462 VB-7213-0-4-10 28 153 413 260 666 409 971 546 1224 679 1430 810 1636 939 1841 1068 2047 VB-7213-0-4-11 40 218 590 372 951 584 1387 780 1749 970 2043 1157 2337 1342 2631 1526 2925

Values are for saturated steam (K = 1). Left column under each inlet pressure is for two-position control, and right column is for proportional control.

Rating

2 psig Inlet 5 psig Inlet 10 psig Inlet 15 psig Inlet 20 psig Inlet 25 psig Inlet 30 psig Inlet 35 psig Inlet

0.2 1.6 0.5 4 1 8 1.5 12 2 14 2.5 16 3 18 3.5 20

required is between two valve sizes, select the larger size. Do not size

Differential Pressure (

ΔP in psi)

Cv Equation

Cv=

ΔP • P23

Where:

Cv= Coefficient of flow Q = Lbs. per hour of steam

ΔP • P23C

ΔP = Di fferential pressure in psi (pressure drop)

P2 = Outlet pressure in psia (absolute) (P2 = Inlet pressure + 14.7 – K = 1 + (0.0007 x °F superheat) (K = 1 for saturated steam)

ΔP)

Page 7

Cavitat ion Limitati ons on Valve Pressure Drop

A valve selected with too hi gh a pressure drop can cause erosi on of discs and/or wire drawing of the seat. I n addition, cavita ti on 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 selecte d. 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 (P

– Pv)

Where:

Pm = Maximum allowable pressure drop (psi) P

= Absolu te inlet press u re (psia )

Pv = Absolute vapor pressure (psia) (r efer to Table-6 or Table-7)

Note:

Add 14.7 psi to gauge supply pressure to obtain absol ute 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 pressur e of 200°F water is 11.53 psia.)

If the pressure drop for this valve is less t han 10.6 psi, cavitation should not be a problem. Systems where cavit ation is shown to be a problem can sometimes be redesigned to provide

lower inlet velo cities. Valves having harder seat material s should be furnished if inl et velocities cannot be lowered.

Table-7 Vapor Pressure of Water Table.

Additional Valve Sizing Information

Water Temp.

(°F)

40 0.12 90 0.70 140 2.89 190 9.34 50 0.18 100 0.95 150 3.72 200 11.53 60 0.26 110 1.28 160 4.74 210 14.12 70 0.36 120 1.69 170 5.99 220 17.19 80 0.51 130 2.22 180 7.51 230 20.78

Vapor

Pressure

(psia)

Water Temp.

(°F)

Vapor

Pressure

(psia)

Water Temp.

(°F)

Vapor

Pressure

(psia)

Water

Temp.

(°F)

For additiona l val ve sizing informat ion, see:

• CA-28 Control Valve Sizing, F-13755

• Valve Selection Chart Water, F-11080

• Valve Selection Char t Ste am, F-11366

• Valve Sizing Slide Rule, TOOL-150

Vapor

Pressure

(psia)

Page 8

INSTALLATION Inspection Inspect t he 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.

Requirements • Tools (not provided): Pipe wrenches

• Training: Installer must be a qualifi ed, experienced techni cian

• Appropriate accessories

Caution:

• Install the valve with the flow in the direction of the flow arrow (“A” port is the inlet and

“AB” port is the outlet).

• Do not exceed the ratings of the device.

• Avoid locations where excessive moistur e, corrosive fumes, or vibration are present.

Mounting 1. 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.

2. The preferred mounting position for the valve is with the valve stem ver ti cal above the valve body. Avoid mounting the valve so that the valve stem is below horizontal.

3. On steam applications where the ambient temperat ure approaches the limit of the actuator, the valve stem should be mounted 45° from vertical.

4. The valves must be piped with the “A” port as the inlet and the “AB” port as the outlet.

Screwed Valve Bodies

The VB-7213-0-4 ser ies screwed valve bodies conform to American Standard Taper Pipe Threa ds (NP T ).

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.

2. Start the joint by hand screwing the pipe into the valve. If the thread enga gem ent feels “right,” turn the pipe by hand as far as it will go.

3. Use a pipe wrench to fully tighten the valve to the pipe. Do not over tighten or strip threads. See Table-8 and Figure-3 for the normal engagement length of the threads. Figure-4 shows a means of tightening the pipe so that th e valve is not twisted or crushed.

Table-8 Normal Thread Engagement Between Male Pipe Thread and Valve Body.

Valve Size Inche s

(NPT)

1/2" 1/2" 1-1/4" 11/16" 3/4" 9/16" 1-1/2" 11/16"

1" 11/16" 2" 3/4"

Normal Engagement

Valve Size Inche s

(NPT)

Normal Engagement

Page 9

Pipe threads too long. Pipe interferes with seat.

Wrong

Right

Figure-3 Nor mal Thread Engagement.

Valve

Assembly

Tighten pipe using this pipe wrench.

Use pipe wrench to prevent valve from turning.

Figure-4 Installation of Screwed End Valves.

Page 10

CHECKOUT

MAINTENANCE & FIELD REPAIR

1. Make sure the valve stem operates smoothly before installing the valve linkage and the actuator.

2. If the stem does not operat e sm oothly, it may indicate t hat 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 pipi ng is under pressure, check the valve body and the connections for l eaks.

4. After the valve linkage and the actuator are installed, check their operation. a. Power 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 tightly .

b. For spring return actuators, allow the actuator to spring return to the stem up

position. Again, the valve stem and linkage should operate smoothly. At the stem up position, the valve should be in its full open position.

Regular maint enance of the t otal sys tem is re commended t o assure su stained p erforma nce. See for maintenance kit part numbers.

Table-9 Maintenance Kits for VB-7213 Valves

Water System Maintenance

Valve Bo dy

Part Number

VB-7213-0-4-1 VB-7213-0-4-2 RYB-721-2 VB-7213-0-4-3 RYB-721-3 VB-7213-0-4-4 RYB-721-4 VB-7213-0-4-5 RYB-721-5 VB-7213-0-4-6 RYB-721-6 VB-7213-0-4-7 RYB-721-7 VB-7213-0-4-8 RYB-721-8 VB-7213-0-4-9 RYB-721-9 VB-7213-0-4-10 RYB-721-10 VB-7213-0-4-11 RYB-721-11

Kit includes replacement packing and stem & plug assembly.

Replacement

Packing Assembly

YBA-622-1 TOOL-20-1

Packing Wrench Valve Repair Kit

RYB-721-1

All heating and cooli ng systems are suscept ible to valve and system problems caused by improper water treatment a nd system stor age procedure s. These guide lines are provi ded to help avoid valve and water system problems resulting from improperly treated water or storage pro cedures in cooli ng and ho t wa ter sy stem s, and to obtain maxim um lif e fro m TAC valves.

Durability of valve stems and packings is dependent on maintaining non-damaging water conditions . In adequate water treatment or fi ltration, not in acc ordance with chemical supplier/ASHRAE ha ndbook r ecommend ations , can re sult in c orrosi on, s cale, and ab rasive particle for mation. Scale and pa rt icula tes can r esult i n stem and pac ki ng scrat ches and can adversely aff ect packing life and ot her parts of the hydronic system.

To maintain non-damaging conditions, follow these guidelines:

• Clean the syst em prior to star t up. Use a nitr ite or mo lybdat e-based t reatment pr ogram.

• Use filtration equipment where needed.

• Properly store off -line systems and monitor water treat ment result s using corrosion t est

coupons.

• Follow the advice of a wate r tr eatment professional .

• Consult EN-205, Water System Guidelines Engineering Information, F-26080, for

further detail s.

Page 11

DIMENSIONAL DATA

Table-10 Di me nsions for VB-7213 Series Valve (Figur e-5).

Part

Number

VB-7213-0-4-1 VB-7213-0-4-2 VB-7213-0-4-3 VB-7213-0-4-4

VB-7213-0-4-5 VB-7213-0-4-6

VB-7213-0-4-7 VB-7213-0-4-8

VB-7213-0-4-9 1-1/4" 1-3/8 (35) VB-7213-0-4-10 1-1/2" 5-3/8 (137) 1-1/2 (38) 2-7/16 (57) VB-7213-0-4-11 2" 6-1/8 (156) 1-9/16 (40) 2-3/4 (70)

Stroke for rated flow. Add up to 1/16 inch (1.6 mm) for disc seating and compression.

Valve

Size

1/2" 3-1/16 (78)

3/4" 3-5/8 (92)

AB C

4-5/8 ( 11 8)

Dimensio ns in Inches (mm )

1-1/16 (27) 1-11/16 (43)

1-1/8 (29)

2-3/8 (60)

(Stem Down)

3/4 (19) 7/16 (11)

(Stroke)

Figure-5 Typical of VB-7213-0-4-P Valve Bodies.

Page 12

F-26075-2

TAC

1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940

www.tac.com