Features Globe Valve 2-Way & 3-Way Assembly Features:
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- Lucinda Manning
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1 Rev: 10/22/13
2 Features Globe Valve 2-Way & 3-Way Assembly Features: DG Series Automated Applications for Building Automation, Temperature Controls, HVAC Two-Way and Three-Way Assemblies Chilled Water Hot Water Steam DG Series globe valves provide stable and accurate control of both water and steam heat exchangers on fan coil units, VAV reheat coils, and air handling units up to 900 GPM. These globe valves feature rangability of greater than 100:1 to provide precise control. Two way standard trim valves provide an equal percentage flow characteristic for use on hot water and chilled water. Two way stainless trim valves - recommended for steam applications, and 3-way mixing valves provide a linear flow characteristic for a N.O. port and equal percentage from a N.C. port. All DG series globe valves feature a cartridge style packing, which is easily replaceable while the valve is in line. Constant plug guiding and precision-machined metal to metal seating assures ANSI Class IV shutoff (.01%) which provides low leakage and energy conservation. Features and Benefits: Features Benefits Rangeability >100:1 Superior control accuracy Valves Actuators Cartridge Packing 2-Way and 3-Way bodies from 2-1/2" to 6" Stainless Steel Trim Option Broad range of spring return and non-spring return models Manual override capability Easily replaceable while valve is in line. Covers all applications from fan coil units to air handling units Applicable to steam inlet pressure up to 50 PSI Meets the requirements of virtually any heat exchanger control application Accommodates start-up commissioning and servicing Direct mount and linkage solutions More choices to meet more technical and economic requirements Fax Phone GL-2
3 Specifications DG Automated Globe Valve Series Specifications SPECIFICATIONS Globe Control valves 2-1/2 through 6 Valves shall be cast iron with ANSI 125 rating. Rangeability shall be 100:1 or greater. Connections shall be ANSI flanged. 2-Way water valves shall have an equal percentage flow characteristic, brass plug and EPDM cartridge style packing which can be replaced with the valve in line. Steam valves shall have a linear flow characteristic, stainless steel plug, Teflon V-ring packings, and shall be suitable for up to 50 PSI steam inlet pressure. Three way valves shall have equal percentage NC port, and linear for NO port. SPECIFICATIONS CHART 2-WAY & 3-WAY MIXING SIZES 2-1/2-6, FLANGED FOR CHILLED/HOT WATER AND STEAM SERVICE: Chilled / Hot Water Steam (0 PSI to 50 PSI Inlet) Sizes 2-1/2 to 6 Flanged Valves, 2 & 3-Way 2-1/2 to 6 Flanged Valves, 2-Way Valve Body -ANSI Class 125 Cast Iron Flanged Cast Iron Flanged Valve Trim Required Bronze Stainless Steel (noted by SS in the valve P/N) Maximum Fluid Temperature and Pressure F PSI F PSI -20 to to Stem Material Stainless Steel (ASTM A582 Type 303) Stainless Steel (ASTM A582 Type 303) Packing EPDM O-Ring Teflon V-Ring/EPDM O-Ring Stem Lift (3/4 stroke for 2-1/2 & 3 valves) (3/4 stroke for 2-1/2 & 3 valves) ( 1-1/2 stroke for 4-6 valves) ( 1-1/2 stroke for 4-6 valves) Maximum Recommended Differential 25 PSI Water 50 PSI Water or Steam The flow characteristic is Equal Percentage for 2-Way valves with standard trim. Flow Characteristic The flow characteristic is Linear for 2-Way valves with Stainless Steel trim. The flow characteristic for 3-Way is equal percentage NC port, and linear for NO port. Maximum Close-Off Pressure Refer to Valve Selection Chart Refer to Valve Selection Chart Leakage Rate Class IV (0.01% of Cv) Class IV (0.01% of Cv) Rangeability >100:1 >100:1 GL-3 Phone Fax
4 Globe Valve Dimensions 2-1/2" - 6", 2 & 3-Way Tandem E D C B A GLOBE VALVE MODEL# DG Size-Way-Cv 2-WAY 3-WAY MIXING & DIVERTING DIMENSIONS, 2-1/2-6 Please reference illustration above Cv A B C D E in. mm in. mm in. mm in. mm in. mm in. mm Connection DG / /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** DG / /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** DG /8.6** 125/218** Largest actuator dimension shown ** indicates tandem mounted actuators Fax Phone GL-4
5 2-Way Valves: 1) Non Spring Return valves are shipped normally closed (stem down) at 0VDC. 2) Spring Return valves are shipped normally open (stem up) at 0VDC (fail open). 3-Way Mixing Valves: 1) Non Spring Return valves are shipped B to AB at 0VDC and will fail in last position. 2) Spring Return valves are shipped B to AB at 0VDC and will fail to B to AB. Globe Valve Set-Up and Overview 2 & 3-Way Mixing Optional 3-Way Spring Return Valve Set-up: 1) Flow from B to AB at 0VDC with flow from A to AB at 10VDC. Fail with flow from B to AB. 2) Flow from B to AB at 10VDC with flow from A to AB at 0VDC. Fail with flow from B to AB. 3) Flow from A to AB at 0VDC with flow from B to AB at 10VDC. Fail with flow from A to AB. 4) Flow from A to AB at 10VDC with flow from B to AB at 0VDC. Fail with flow from A to AB. 3-Way Mixing Globe Valve Set-Up for Diverting 1) Non Spring Return valves are shipped B to AB at 0VDC. 3-Way Mixing: Stem down = Flow from A to AB (Common). Stem up = Flow from B to AB (Common). 3-Way Diverting: Stem down = Flow from AB (Common) to A. Stem up = Flow from AB (Common) to B. 2) Spring Return valves are shipped B to AB at 0VDC will fail B to AB. Common Port Upper Port Upper Port Common Port Any configuration of fail open, fail closed, reverse acting or direct acting can be set up upon special request. All diverting globe valves will ship in the above configuration unless otherwise specified. Note: 1/2" through 2" are labeled A, B, and AB. (AB) (B) (A) Bottom Port (A) (B) (AB) Bottom Port 3-Way Globe Valve Piping Schematics Mixing Application - fluid enters through two inlets and exits through one outlet. Diverting Application - fluid enters through one inlet and exits through two outlets. Valve Operation AB A AB A B B GL-5 Normally Open (PDTC) Phone Normally Closed (PDTO) Mixing (3-Way) Diverting View (3-Way) Fax
6 Globe Valve Liquid Sizing VALVE SIZING STEPS - Liquid STEP ONE Determine the designed Cv by using the following equation. Q G Cv = Q G Cv Where = Flow in gallons per minute (GPM) required to pass through the valve = Specific gravity of fluid * = Designed pressure drop across the valve in PSI = Flow coefficient NOTES * Specific gravity is negligible (equal to 1) for water below 200 F. Use actual specific gravity of pure fluids other than water. In most cases, the valve selected for a H2O mixture will not be affected by the specific gravity. EXAMPLE The Specific Gravity of 50% Water (Compound 1) and 50% Ethylene Glycol Solution (Compound 2): = + = 1.05 Specific Gravity wt% of Compound 1 = + G soln Specific Gravity (G) wt% of Compound 2 Specific Gravity (G) STEP TWO Determine whether the valve should be line size or sized to match the designed pressure drop (typical for modulating applications where precise control is required.) OPTION 1 LINE SIZE Go to page GL-11 and GL-12, Globe Valve Close-Off Charts. Using the line size, find a valve of the same size with a Cv that best matches the one calculated in Step 1. OPTION 2 SIZE FOR PRECISE CONTROL Go to page GL-10 (2-way or 3-way), Globe Valve Piping Geometry Charts. Find the line size at the top of the chart. Scan down the page to the Cv that best matches the one calculated in Step 1. STEP THREE STEP FOUR Determine the actual pressure drop using the below equation. 2 Q G = Cv If the pressure drop is acceptable*, go to Step 4. If not, repeat Steps 2 and 3, selecting an alternate valve. Check to be sure that the close-off requirements are met. Refer to Pages GL-11 and GL-12 * Recommended to be no higher than 25 PSI or match the designed pressure drop, 3, 4, 5, and 6 PSI are commonly accepted for modulating applications. Fax Phone GL-6
7 Globe Valve Sizing Steam Application VALVE SIZING STEPS - Steam When sizing a globe valve for a steam application, there are two methods of calculating the required Cv. The first method is to use the Steam Tables on pages GL-15 and GL-16. The tables are based on the steam pressure and pounds per hour. These tables use the standard rule of an 80% pressure drop for modulating applications and a 10% pressure drop for on/off control. If the exact inlet pressure of the system is not referenced on the charts or a different pressure drop is desired, the following equations can also be used to calculate the required valve Cv. Note: The below equations are designed for sizing globe valves please consult Bray if you desire to use a ball or butterfly valve. STEP ONE STEP TWO STEP THREE Modulating Control: Determine the proper pressure drop. For low pressure steam (15 PSIG or less) use a pressure drop that is 80% of the gauge inlet pressure. = 0.8 x Pi (inlet pressure in PSIG) For higher pressure steam (greater than 15 PSIG) use a pressure drop that is 42% of the absolute inlet pressure. = 0.42 x Pi (inlet pressure in PSIA) Pi = Absolute Inlet Pressure = Gauge Pressure Calculate the absolute outlet pressure (Po). Po = Pi - Pi = Absolute Inlet Pressure = Gauge Pressure Calculate the valve coefficient (Cv) of flow. Q Cv = 3 x Po Where: Cv = Valve coefficient of flow Q = Pounds per hour of steam = #/hr = Pressure drop across open valve Po = Outlet pressure in PSIA STEP ONE STEP TWO STEP THREE STEP FOUR On/Off Control: Determine the proper pressure drop. For low pressure steam (15 PSIG or less) use a pressure drop that is 10% of the gauge inlet pressure. = 0.1 x Pi (inlet pressure in PSIG) For higher pressure steam (greater than 15 PSIG) use a pressure drop that is 10% of the absolute inlet pressure. = 0.1 x Pi (inlet pressure in PSIA) Pi = Absolute Inlet Pressure = Gauge Pressure Calculate the absolute outlet pressure (Po). Po = Pi - Pi = Absolute Inlet Pressure = Gauge Pressure Calculate the valve coefficient (Cv) of flow. Q Cv = 3 x Po Where: Cv = Valve coefficient of flow Q = Pounds per hour of steam = #/hr = Pressure drop across open valve Po = Outlet pressure in PSIA Refer to the below chart to select the proper trim for the application. GLOBE VALVE TRIM SELECTION FLOWING MEDIA Chilled / Hot Water Low-Pressure Steam (0-15 PSI Intet) Medium-Pressure Steam (16-50 PSI Intet) High-Pressure Steam (51 PSI Intet and Greater) GLOBE VALVE Standard Trim Stainless Steel Trim - SS Stainless Steel Trim - SS Consult Bray for Assistance GL-7 Phone Fax
8 Adjusted Cv Charts for Piping Geometry Charts Fp Adjusted Cv 2-WAY - Valve Size 2-1/ Valve Model Number Pipe Size 2-1/ DG DG DG DG DG Adjusted Cv 3-WAY - Mixing & Diverting Valve Size 2-1/ /2 DG DG DG DG DG EXAMPLE Valve Model Number Pipe Size What is the correct Cv rating for a DG valve when placed in a 4 pipe? Look a the 4 pipe column and cross over to the valve model #. As you can see the correct Cv rating is These values also apply to Stainless Steel trim valves where applicable. Fax Phone GL-8
9 Globe Valve Close-Off Chart 2-Way 2-WAY DG Series - Close-Off Chart (PSI) 2-WAY On/Off & SIZE Cv MODEL # On/Off D NON SPRING RETURN ACTUATORS On/Off D On/Off D D DC T DC T-D SPRING RETURN On/Off On/Off DS DS D DS T DS T-D 2-WAY Modulating 0(4)-20mA NON SPRING RETURN ACTUATORS 0(4)-20mA 0(4)-20mA 0-20mA 0-20mA SPRING RETURN 0(4)-20mA 0(4)-20mA SIZE Cv MODEL # DM DM DM D DCM DCM D DMS DMS D 2-1/2 63 DG X DG X DG X DG X DG X * Available in 120VAC. Requires field furnished 500 Ohm resistor. D Indicates tandem mounted actuators are standard for higher close-off. X Indicates "N = Normally Open" or "C = Normally Closed". Refer to the Actuator Section for a list of actuators with additional options (i.e. auxiliary switches etc.). When used in a Diverting Application, Differential Pressure should not exceed 22.5 PSI when fully open 2-WAY VAL-SRS Series - Close-Off Chart (PSI) 2-WAY VAL-SRS Series Spring Return Actuators NORMALLY OPEN NORMALLY CLOSED SIZE Cv MODEL # 2-1/2 63 DG X DG X DG X DG X DG X VAL-SRS07P VAL-SRS15P VAL-SRS07P VAL-SRS15P X Indicates "N = Normally Open" or "C = Normally Closed". GL-9 Phone Fax
10 Globe Valve Close-Off Chart 3-Way 3-WAY DG Series 3-WAY On/Off & SIZE Cv MODEL # On/Off D Close-Off Chart (PSI) On/Off D NON SPRING RETURN ACTUATORS On/Off D D DC T DC T-D SPRING RETURN On/Off On/Off DS DS D DS T DS T-D 3-WAY Modulating 0(4)-20mA 0(4)-20mA NON SPRING RETURN ACTUATORS 0(4)-20mA 0-20mA 0-20mA SPRING RETURN 0(4)-20mA 0(4)-20mA SIZE Cv MODEL # DM DM DM D DCM DCM D DMS DMS D 2-1/2 63 DG X DG X DG X DG X DG X * Available in 120VAC. Requires field furnished 500 Ohm resistor. D Indicates tandem mounted actuators are standard for higher close-off. X Indicates "N = Normally Open" or "C = Normally Closed". Refer to the Actuator Section for a list of actuators with additional options (i.e. auxiliary switches etc.). When used in a Diverting Application, Differential Pressure should not exceed 22.5 PSI when fully open 3-WAY VAL-SRS Series - Close-Off Chart (PSI) 3-WAY VAL-SRS Series Spring Return Actuators NORMALLY OPEN - (Lower Port) NORMALLY CLOSED - (Upper Port) SIZE Cv MODEL # 2-1/ DG DG DG DG DG VAL-SRS07P VAL-SRS15P VAL-SRS07P VAL-SRS15P Fax Phone GL-10
11 Globe Valve - VAL-SRS07P & VAL-SRS15P Features and Benefits The VAL-SRS07 and VAL-SRS15P Spring Return Electro Hydraulic Actuators provide precise modulating control of Bray cast iron globe valves. These actuators use electro hydraulic force to achieve superior close-off pressure ratings. The stroke of these actuators is up at the low input signal condition, and down in the high signal input condition. A weather shield is available to offer a degree of protection against rain, sleet and damage from external ice formation. Features and Benefits: High Output Force Provides high close-off pressure ratings Direct Mount to Bray Series Spring Return Operation User-Selectable Input Signals Manual Override Handle Visual and Electronic Position Indication Eases installation and minimizes space requirements Returns valve to the open or closed position upon loss of power Accepts current or voltage inputs Allows manual positioning during set-up or balancing Provides position feedback and provides for remote monitoring GL-11 Phone Fax
12 Globe Valve - VAL-SRS07P & VAL-SRS15P Actuator Dimensions 7 in. (178mm) 5-1/2 in. (140mm) 3-1/2 in. (89mm) 3-1/2in. (89mm) 5-13/32 in. (137mm) KNOCKOUTS FOR STANDARD 1/2" CONDUIT CONNECTOR 9-1/4 in. (235mm) 14-3/4 in. (375mm) KNOCKOUTS FOR STANDARD 1/2" CONDUIT CONNECTOR (24mm) (10 or 14mm) MINIMUM ACCESS SPACE REQUIRED 1-1/4 in. (44mm) 4 (100) 8 (200) VAL-SRS07P/SRS15P SERIES SPECIFICATIONS Model Number VAL-SRS07P 2-1/2 to 3 valves VAL-SRS15P 4 to 6 valves 24 VAC (±20%), 50/60 Hz Power Requirements VAL-SRS07P 18 VA Nominal VAL-SRS15P 28 VA Nominal Control Input Signal Input Y 0 to 10 VDC Input R 4 to 20 ma Input Impedance Current 100,000 Ω Voltage 250 Ω Feedback Signal Current 0 to 10 VDC Voltage 4 to 20 ma Mechanical Output Stroke Range Nominal Stroke Timing Ambient Operating Conditions Enclosure Rating Shipping Weight Stem Up Stem Down VAL-SRS07P VAL-SRS15P Power Stroke 3/4" (20 mm) 1-1/2" (40 mm) 120 seconds NEMA 1, Weather shield available VAL-SRS07P 18.5 lb. (8.4 kg) VAL-SRS15P 21.4 lb. (9.7 kg) Agency Compliance UL 873 Listed, C-UL C22.2 No lb. (2684 N) (Spring return stroke) 1000 lb. (4400 N) (Power stroke) 15 seconds for VAL-SRS07P Return Stroke 20 seconds for VAL-SRS15P 5 to 130 F (-15 to 55 C), 10 to 90% RH, non-condensing, 86 F (30 C) maximum dew point 3 in. (76mm) The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Bray office. Bray Controls shall not be liable for damages resulting from misapplication or misuse of its products. Fax Phone GL-12
13 Fax Phone GL-13 Globe Valve Sizing Using Steam Tables * Indicates 2-Position Control Applications. Higher Pressure Drop for Modulating Control Applications. Note: Steam Capacity in Pounds per Hour. Table is Based on Saturated Steam * * * * * * * * * Inlet Pressure (PSIG) Low-Pressure Steam (SSBS) Inlet Pressure (PSIG) Medium-Pressure Steam (SS3) High-Pressure Steam (SS3) Inlet Pressure (PSIG) Cv 0.2* STEAM SIZING TABLE 1
14 Globe Valve Sizing Using Steam Tables Cv STEAM SIZING TABLE 2 0.2* Low-Pressure Steam (SSBS) Inlet Pressure (PSIG) * 4 1* 8 1.5* 12 2* * 16 4* 23 5* * 37 10* * Indicates 2-Position Control Applications. Higher Pressure Drop for Modulating Control Applications. Note: Steam Capacity in Pounds per Hour. Table is Based on Saturated Steam. Medium-Pressure Steam (SS3) Inlet Pressure (PSIG) High-Pressure Steam (SS3) Inlet Pressure (PSIG) 100 Fax Phone GL-14
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