Johnson Controls V248 Series Data Sheet

V248 Screw Connection Valve

V248 Series Three-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants

Description

The V248 Series Three-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants regulate water flow and control refrigerant head pressure in systems with single or multiple water-cooled condensers.

V248 valves have an adjustable opening point in a refrigerant pressure range of 200 to 400 psi (13.8 to 27.6 bar). V248 valves are available in 1/2 in. through 1-1/2 in. size for use with standard, non-corrosive, high-pressure refrigerants.

Maritime models, which have nickel copper (Monel®) internal parts, are available for applications where the media may be corrosive to the internal parts.

Refer to the V248 Series 3-Way

Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants Product

Bulletin (LIT-12011515) for important product

application information.

Valves and Valve Accessories

Features

• no close fitting or sliding parts in water passages

• accessible range spring

• take-apart construction

• pressure-balanced design

• corrosion-resistant material for internal parts

Repair Information

If the V248 Series Three-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants fails to operate within its specifications, refer to the V248

Series 3-Way Pressure-Actuated Water-Regulating Valves for High-Pressure

Refrigerants Product Bulletin (LIT-12011515)

for a list of repair parts available.

Code No. LIT-1900576

Selection Charts

North American Standard Production Models - Range 200 to 400 psi

Product Code Number Construction Valve Size and Connection Element Style Shipping Weight, lb (kg)

V248GB1-001C Direct Acting, Commercial 1/2 in. NPT Screw Style 5 5.0 (2.3) V248GC1-001C Direct Acting, Commercial 3/4 in. NPT Screw Style 5 6.5 (3.0) V248GD1-001C Direct Acting, Commercial 1 in. NPT Screw Style 5 12.0 (5.4) V248GE1-001C Direct Acting, Commercial 1-1/4 in. NPT Screw Style 5 16.0 (7.2) V248GF1-001C Direct Acting, Commercial 1-1/2 in. NPT Screw S tyle 5 25.0 (11.3) V248GK1-001C Direct Acting, Commercial 3/4 in. Union Sweat Style 5 7.0 (3.2) V248GL1-001C Direct Acting, Commercial 1 in. Union Sweat Style 5 12.0 (5.4) V248GM1-001C Direct Acting, Commercial 1-1/4 in. Union Sweat Style 5 13.7 (6.2)

European Standard Production Models - Range 13.8 to 27.8 bar

Product Code Number Construction Valve Size and Connection Element Style Shipping Weight, lb (kg)

V248GB1B001C Direct Acting, Commercial 1/2 in. BSPT Screw, ISO 7 Style 5 5.0 (2.3) V248GC1B001C Direct Acting, Commercial 3/4 in. BSPT Screw, ISO 7 Style 5 6.5 (3.0) V248GD1B001C Direct Acting, Commercial 1 in. BSPT Screw, ISO 7 Style 5 12.1 (5.5) V248GE1B001C Direct Acting, Commercial 1-1/4 in. BSPT Screw, ISO7 Style 5 16.0 (7.2) V248GF1B001C Direct Acting, Commercial 1-1/2 in. BSPT Screw, ISO 7 Style 5 25.0 (11.3) V248HC1B001C Direct Acting, Mari tim e 3/4 in. BSPP Screw, ISO 228 Style 5 6.5 (3.0)

The performance specifications are nomina l and con form to accep table ind ustry stand ards. For applicati ons at con ditions be yond these specification s, consult th Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.

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Refrigerant Head Pressure Rise

FIG

P = P - P

Available Water Pressure

Cooling Tower

Loss 2

3-Way

Valve

COND

1P2

+ ...

Balancing Valve

FIG:3wy_ prss_dr



Flow Required

Flow =

(Temp. - Temp. )

Outlet Inlet

FIG:flw_e qn

Valve Opening Pressure

FIG:eqn_

OPEN CLOSE

Valves and Valve Accessories

V248 Series Three-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants (Continued)

Applications

Each application is unique and requires specific engineering data to properly size and design a system to fulfill the appropriate requirements. Typically, a valve is replaced with another valve of the same size in a properly sized and engineered system. In North America, contact Johnson Controls/PENN® Refrigeration Application Engineering at 1-800-275-5676 to obtain specific engineering data. In other areas, contact the local Johnson Controls® sales office to obtain specific engineering data.

To make a rough field estimate of the size of valve for an application, find the valve size needed by locating a point on a flow chart that satisfies these requirements:

• water flow required by the condenser (Flow)

• refrigerant head pressure rise (P

• available water pressure (P

AVAIL

RISE

)

Follow these steps, and use the information obtained to locate a point on one of the flowcharts that satisfies all three steps.

1. Take the water flow required by the condenser (Flow) from information provided by the manufacturer of the condensing unit. If the manufacturer’s information is unavailable, use the following information to make a rough approximation of water flow in gallons per minute (gpm) [cubic meters per hour (m

/hr)]:

• System Capacity (Tons of Refrigeration)

Inlet

Outlet

)

• Outlet Water Temperature (Temp.

• Inlet Water Temperature (Temp.

Calculate the flow using the following formula:

Tons of Refrigeration x 30

RISE COND OPEN

3. Determine the available water pressure to the valve (P the following steps. This the actual water pressure available to force

:eqn_h d_prssr_r s

AVAIL

water through the valve. a. Determine the minimum inlet pressure (P

pressure from city water mains, pumps, or other sources.

b. Pressure drop through condenser (P

water pressure between the condenser inlet and the condenser

). This is the water

) is the difference in

COND

outlet. Obtain this information from the condenser manufacturer.

c. Estimate or calculate the pressure drop through all associated

piping (P

d. Subtract the P

LOSS

COND

and P

from PIN. The result is P

LOSS

Pump

Condenser

Loss 1

Bypas s Line

) using

AVAIL

Note: If the outlet temperature is unknown, assume it to be 10F (6C) above the inlet temperature.

2. Determine refrigerant head pressure rise above the valve opening point (P

) using the following steps:

RISE

a. The Valve Closing Pressure (P

refrigerant pressure at the highest ambient temperature the refrigeration equipment experiences in the Off cycle. Use a Pressure-Temperature Chart for the refrigerant selected to find this pressure.

b. To approximate the Valve Opening Pressure (P

about 10 psig (0.7 bar) to the Valve Closing Pressure.

P = P +10 psi (0.7 bar)

c. From the Pressure-Temperature Chart for the refrigerant

selected, read the Refrigerant Condensing Pressure (P (operating head pressure) corresponding to the selected condensing temperature.

d. Subtract the Valve Opening Pressure from the Refrigerant

Condensing Pressure. This gives the head pressure rise.

The performance specifications are no minal and co nform t o acceptab le ind ustry standar ds. For appl ications at condition s beyond these specifica tions, consult th Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.

Loss 1

Loss 2

) is equal to the

LOSS

P= P- (P+ P)

AVAIL IN COND LOSS

4. Select the proper valve size from the flowcharts by locating a point on a chart that satisfies the flow, the head pressure rise above opening point, and the pressure drop across the valve.

OPEN

), add

Metric Conversions

Use these equations to convert between U.S. and S.I. units.

•1 dm

• 1 bar = 100 kPa = 0.1 MPa  1.02 kg/cm

opn_prss r

)

COND

/s = 3.6 m3/h = 15.9 U.S. gal. /min. = 13.2 U.K. gal. /min.

= 0.987 atm  14.5 psig

R-182

1/2 in. Direct Acting Valve Flowchart

0.7 1.4 2.1 2.8 3.5 4.1 4.8 5.5 6.2 6.9

0.0

0.7

1.4

2.0

2.7

3.4

4.1

10 20 30 40 50 60 70 80 90 100 110

Refrigerant Head Pressure Above Opening P

Rise

(bar)

Flow

(m³/hr)

Flow

(gpm)

Refrigerant Head Pressure Above Opening P

Rise

( psig )

FIG:V248_0.5 in. graph

10 (0.7)

5 (0.3)

2 (0.1)

Pressur e Dr o p

Through Valv e,

psig(bar)

14.5 (1.0)

20 (1.4)

3/4 in. Direct Acting Valve Flowchart

0.7 1.4 2.1

2.8

3.5

4.1

4.8

5.5

6.2

6.9

0.0

1.1

2.3

3.4

4.5

5.7

10 20 30 40 50 60 70 80 90

100

110

Refrigerant Head Pressure Above Opening P

Rise

(bar)

Flow

(M³/hr)

Flow

(gpm)

Refrigerant Head Pressure Above Opening P

Rise

( psig )

10 (0.7)

5 (0.3)

2 (0.1)

Pressure Drop

Through Valv e,

psig (bar)

14.5 (1.0)

20 (1.4)

FIG:V248_0.75 in. graph

Valves and Valve Accessories

V248 Series Three-Way Pressure-Actuated Water-Regulating Valves for High-Pressure Refrigerants (Continued)

V248 Flowcharts

The maximum recommended differential water pressure across a valve is 20 psig (1.4 bar).

The performance specifications are no minal and co nform t o acceptab le ind ustry standar ds. For appl ications at condition s beyond these specifica tions, consult th Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc.

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