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VGD Series
VGDxx.xxxU Gas Valves
for use with SKPxx.xxxU electro‐hydraulic actuators
VGD20.xxxU
ISO 9001 and 14000
REGISTERED FIRM
Description
Only with series SKPxx.xxxUx actuators
The normally closed VGDxx.xxxU series of modular double‐body gas valves combine
with SKPxx.xxxU series electro‐hydraulic actuators to provide safety shut‐off, gas
pressure regulation and/or air‐gas ratio control for commercial or industrial gas
burners.
Table 1. VGDxx.xxxU model numbers
Model Numbers
VGD20.253U
VGD20.323U
VGD20.403U
VGD20.503U
VGD40.065U
VGD40.080U
VGD40.100U
VGD40.150U
Technical Instructions
Body style
Double
Double
Double
Double
Double
Double
Double
Double
Document No. 7631
VGDxx.xxxU
November 08, 2017
VGD40.xxxU
Connection
NPT thread
NPT thread
NPT thread
NPT thread
NPT thread
NPT thread
ANSI flange
ANSI flange
Siemens AG Building Technologies Division
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Summary of Contents for Siemens VGD20.253U
- Page 1 ISO 9001 and 14000 REGISTERED FIRM Only with series SKPxx.xxxUx actuators Description The normally closed VGDxx.xxxU series of modular double‐body gas valves combine with SKPxx.xxxU series electro‐hydraulic actuators to provide safety shut‐off, gas pressure regulation and/or air‐gas ratio control for commercial or industrial gas burners. Table 1. VGDxx.xxxU model numbers Model Numbers Body style Connection VGD20.253U Double NPT thread VGD20.323U Double NPT thread VGD20.403U Double NPT thread VGD20.503U Double NPT thread VGD40.065U Double NPT thread VGD40.080U Double NPT thread VGD40.100U Double ...
- Page 2 The first (inlet) valve has a flat valve disc applicable for safety shut‐off function only. The second (outlet) valve has a contoured valve disc for use with pressure regulating actuators (SKP2x.xxxU, SKP5x.xxxU, SKP7x.xxxU) A 1‐inch NPT vent connection between the valves Each VGD20.xxxU double‐valve requires 2 threaded mounting flanges (AGFxx.xxU). Each flange includes the necessary installation hardware (bolts, nuts and O‐ring). Each mounting flange has a ¼‐inch NPT pressure tap. The flanges can be pre‐mounted onto the pipe, and then bolted onto the VGD20.xxxU gas valve body. This feature eliminates the use of pipe unions and permits the gas valve assembly to be easily removed from a gas train Connecting pattern of the 1...2 inch AGFxx.xxU flanges are identical. This space permits any AGFxx.xxU flange to be mounted to any VGD20.xxxU valve body NOTE: VGD20.xxxU valves and AGFxx.xxU flanges must be ordered as separate items (see Tables 2 and 3). Compact VGD40.xxxU double‐valve bodies consist of 2 safety shut‐off valves in series VGD40.xxxU models Each individual safety shut‐off valve has double seats to achieve high flow Patented seat construction with individual closing spring for each seat to assure reliable shut‐off and high close‐off pressure rating Full port vent line connection plates are available NOTE: VGD40.xxxU valves and AGA40.xxxxU vent connection plates must be ordered as separate items (see Tables 2 and 3). Page 2 Siemens AG Building Technologies Division ...
- Page 3 VGD Series Double Valves Technical Instructions Document Number CC1N7631us November 08, 2017 Application All VGDxx.xxxU valves can be combined with any SKPxx.xxxU series actuator. The actuator can be mounted while the valve is installed and under pressure. SKPxx.xxxU regulating actuators are applicable for both low and high supply gas pressure applications, eliminating excessive regulator inventories. Maximum pressure ratings vary with valve size (see Table 2). All VGDxx.xxxU valves perform these functions in combination with each of the following actuators: SKP15.xxxU Safety shut‐off SKP25.xxxU Safety shut‐off and constant pressure regulation or zero governor SKP55.xxxU Safety shut‐off, pressure regulation and differential pressure air‐gas ratio control SKP75.xxxU Safety shut‐off, pressure regulation and adjustable air/gas ratio control Since more than one function can be performed by a single valve, fewer components and fittings are required‐significantly reducing both the size and weight of the gas train. In addition, smaller diameter gas valves can be used. For details on valve sizing see the flow chart (figure 3). CAUTION: Do not oversize valves equipped with a regulating SKP2x.xxxU / SKP5x.xxxU / SKP7x.xxxU actuator. Oversizing may limit turndown and could cause oscillations. Siemens AG Building Technologies Division Page 3 ...
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Page 4: Ordering Information
Close‐off Capacity Number of test Valve body number operating pressure CFH points, material pressure psi Natural gas 1/4" NPT psi at Inlet Outlet P = 1" W.C. VGD20.253U *) 1" 20 30 600 Aluminum Two ¼‐inch and VGD20.323U *) 1¼" 20 30 1200 Aluminum one 1‐inch port VGD20.403U*) 1½" 20 30 1,850 ... - Page 5 AGA40.4050U 1” NPT vent connection plate for VGD40.xxxU Each vent connection AGA40.6580U 1 ¼” NPT vent connection plate for VGD40.xxxU includes ¼” NPT test port, AGA40.0100U 2” NPT vent connection plate for VGD40.xxxU see Mounting instruction M7631.3 (74 319 0278 0) AGA40.0150U 2 ½” NPT vent connection plate for VGD40.xxxU AGA61 Manual adjusting throttle attachment AGA61 permits VGDxx.xxxU series valves to be used as adjustable limiting orifice valves. Once adjusted, the AGA61 has a provision to be sealed from tampering. AGA66 Sealing gasket to provide NEMA 3, NEMA 3R, and NEMA 4 protection. Gasket kit to mount SKPxx.xxxU ‐ Place between actuator SKPxx.xxxU and valve VGDxx.xxxU ‐ Increases degree of protection from IP54 to IP65 ‐ Refer to Mounting Instruction M7643.2 (74 319 0421 0) Siemens AG Building Technologies Division Page 5 ...
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Page 6: Specifications
Operating Maximum operating pressure See Table 2 environment Maximum back pressure (differential) VGD20.xxxU: 2 psi (150 mbar) VGD40.xxxU: 4 psi (300 mbar) Close‐off pressure See Table 2 Permissible gas temperature 14 °F to 140 °F (‐10 °C to 60 °C) Permissible operating temperature 14 °F to 140 °F (‐10 °C to 60 °C) Use Siemens gas valves are in accordance with UL429. The valve is used as: Safety shutoff valve (in connection with SKP15.xxxU) ‐ Control valve with safety shutoff function (in connection with SKP25.xxxU, SKP5x.xxxU or ‐ SKP7x.xxxU) Perm. mounting position 7631z01us/0815 Operating pressure See Type summary Types of gases Suitable natural gases, propane, butane and air ... -
Page 7: Operation
Specifications Physical Body materials See Table 2 characteristics Weight See Tables 4 Connections Pipe connections NPT threads or ANSI class 150 flanges (see Table 2) Pressure and vent taps See Tables 2 and 3 All VGDxx.xxxU gas valves are normally closed, two‐way valves. The valves have a standard, Operation integral, stainless steel mesh filter (0.9 mm) in the inlet to protect the downstream components against contamination. All valves have ¼ NPT ports for pressure test connection. A full size vent connection plate is available as an accessory for VGD40.xxxU valves. See Table 2 and 3 for details on ports and vent connection plates. AGF10... AGF10... 7631z50us/0815 Figure 1. Sectional view of VGD20.xxxU VGD20.xxxU double valves consist of two valves in series. The first (inlet) valve has a flat valve disc suitable for the safety shut‐off function only. The second (outlet) valve has a contoured valve disc for stable regulating control and smooth release of gas. Siemens AG Building Technologies Division Page 7 ... - Page 8 Technical Instructions VGD Series Double Valves Document Number CC1N7631us November 08, 2017 Operation, continued 7631z53us/1215 Figure 2. Second view of VGD40.xxxU flange models VGD40.xxxU double valves consist of two valves in series. Each valve has a double seat to achieve high flow (see Figure 2). Closing springs: Each double seat uses one pair of springs. The spring forces act separately as closing forces on the individual valve seats. Page 8 Siemens AG Building Technologies Division ...
- Page 9 10000 100000 cf/h Butane gas 2.00 1000 10000 100000 cf/h 1.00 1000 10000 100000 m3/h 1.00 1000 Figure 3. Sizing double valves Assumptions: 1) Pressure downstream of valve is atmospheric 2) Maximum gas temperature of 140 °F 3) Valve in fully open position NOTE: Pressure drop is total drop across both valves when using a SKPx5.xxxU actuator, with or without an AGA66. CAUTION: Do not oversize valves equipped with regulating actuators SKP2x.xxxU, SKP5x.xxxU or SKP7x.xxxU. Oversizing may limit turndown and could cause oscillations. Siemens AG Building Technologies Division Page 9 ...
- Page 10 (63.5) (19) AGF10... 1/4" NPT Table 4. VGD20.xxxU dimensions in inches (mm) with 2 flanges AGF10.xxU Valve model Nominal size D Length (L) Weight inch inch pounds (mm) (Kg) 1” 10.59 + 2 x 1.02 7 VGD20.xxxU (269 + 2 x 26) (3.2) 1 ¼“ 10.59 + 2 x 1.02 7 (269 + 2 x 26) (3.2) 1 ½“ 10.59 + 2 x 1.02 7 (269 + 2 x 26) (3.2) 2” 10.59 + 2 x 1.18 7 (269 + 2 x 30) (3.15) Page 10 Siemens AG Building Technologies Division ...
- Page 11 VGD Series Double Valves Technical Instructions Document Number CC1N7631us November 08, 2017 Dimensions, continued Dimensions in Inches (mm) VGD40.065U / VGD40.080U 7631m21us/1215 a) Base plate Siemens AG Building Technologies Division Page 11 ...
- Page 12 (72) (115.5) (22) (222) 18.90 13.29 5.71 7.40 2.09 2.30 6.61 10.31 0.63 ‐‐‐ ‐‐‐ 9.5 0.91 3.92 5.61 0.90 10.63 VGD40.150U (480) (337.5) (145) (188) (53) (58.5) (168) (262) (16) (241) (23) (99.5) (142.5) (22.9) (270) *) SW = width across flats Page 12 Siemens AG Building Technologies Division ...
- Page 13 4.13 5.49 3.17 0.79 19 (185) (105) (139.5) (80.5) (20) (8) VGD40.100U 8.54 4.76 6.26 3.94 1.95 29 (210) (121) (159) (100) (49.5) (13) VGD40.150U 11.30 6.14 7.80 5.47 2.28 53 (287) (156) (198) (139) (58) (24) Siemens AG Building Technologies Division Page 13 ...
- Page 14 Table 7. AGA40.xxxxU Models Vent connection plate (optional) Vent connection thread "Z" ● ● AGA40.6580U 1¼" NPT ● AGA40.0100U 2" NPT ● AGA40.0150U 2½" NPT Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners. Siemens AG Building Technologies Division Your feedback is important to us. If you have Document No. CC1N7631us Berliner Ring 23 comments about this document, please send them Country of Origin: DE 76437 Rastatt to techsupport@SCCcombustion.com GERMANY Page 14 Siemens AG Building Technologies Division ...