VGA Series Pneumatic Three-Way Air Switching Valves

Transcription

1 VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin VGA8x2GT+3008E , Rev. C Code No. LIT Part No , Rev. C Issued February 2016 The VGA Series Three-Way Air Switching Valves switch the flow of air from one supply pressure to another in dual supply pressure control systems. All VGA Series Three-Way Air Switching Valves come equipped with a factory-mounted V Exposed Pneumatic Actuator, and are available with or without a variety of factory-installed adaptor fitting configurations (as noted in table 2). The VGA Series Valve is also furnished with a split-clamp bracket, for surface mounting in an upright position. The V Series Pneumatic Actuator features a die-cast aluminum housing and a molded, synthetic rubber diaphragm design. This molded diaphragm provides a constant effective area throughout the valve stem stroke. The actuator can be easily removed or repositioned by loosening a single set screw without disturbing the remainder of the valve assembly. The cast bronze valve body complies with ANSI standards. The valve body features a brass seat against a molded elastomeric disc, which provides tight shutoff. An arrow is cast into the valve body indicating the direction of flow for proper piping. Table 1: Features and Benefits Features Benefits Available with a Choice of Various Factory-Installed Adapter Fittings High Volume Output Rated for 125 psig (861 kpa) Systems Rugged Cast Bronze Body with Corrosion-Resistant Mounting Bracket Document Flow Characteristics and Cross Referencing Equipped with V-3000 Series Actuator Refer to the QuickLIT website for the most up-to-date version of this document. Note: Refer to the Specifications table for limits and factory settings, as well as other air valve specification information. Figure 1: VGA Series Pneumatic Three-Way Switching Valve Shortens the installation time, as each air switching valve arrives on the job site already equipped with appropriate fittings for the application Results in a universal air switching valve, utilizing the power of the V Pneumatic Actuator to accommodate even the most demanding supply changeover requirements Provides for sturdy mounting and piping of the air switching valve, allowing for vibration-free and corrosion-free operation Simplifies product application and selection for new installations or existing product changeout Allows for worldwide product availability VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin 1

2 Application Overview IMPORTANT: The VGA Series Pneumatic Three-Way Air Switching Valve is intended to control air flow under normal operating conditions. Where failure or malfunction of the valve could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the valve. IMPORTANT : Le VGA Series Pneumatic Three-Way Air Switching Valve est destiné à réguler un débit l'air dans des conditions normales de fonctionnement. Lorsqu'une défaillance ou un dysfonctionnement du valve risque de provoquer des blessures ou d'endommager l'équipement contrôlé ou un autre équipement, la conception du système de contrôle doit intégrer des dispositifs de protection supplémentaires. Veiller dans ce cas à intégrer de façon permanente d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou des dispositifs de sécurité ou de limitation, ayant une fonction d'avertissement ou de protection en cas de défaillance ou de dysfonctionnement du valve. Operation When the control air pressure in the V Pneumatic Actuator exceeds the switchover point of 13 psig (90 kpa), the valve stem-and-plug assembly is forced down, opening the (Normally Closed) port and closing the N.O. (Normally Open) port. When the control pressure in the actuator nears 0 psig (0 kpa), the spring allows the stem-and-plug assembly to return to its normal position, opening the N.O. port and closing the port. Table 2: Nominal Flow Capacities, scim (ml/s) VGA Series Pneumatic Supply Pressure: 15 psig (103 kpa) Supply Pressure: 20 psig (138 kpa) Three-Way Air Switching Valve Pressure Drop (psi) Pressure Drop (psi) With 3/8 in. Compression Adaptors 1/2 in. Internal NPT on All Ports (No Adaptors) 4,320 (1,179) 2,074 (566) 6,048 (1,651) 18,144 (4,953) 6,480 (1,769) 2,938 (802) 8,640 (2,359) 26,784 (7,312) 9,504 (2,595) 3,888 (1,061) 12,096 (3,302) 34,560 (9,435) 12,960 (3,538) 5,616 (1,533) 16,848 (4,600) 43,200 (11,794) 5,184 (1,415) 2,160 (590) 6,480 (1,769) 19,440 (5,307) 7,344 (2,005) 3,024 (826) 9,504 (2,595) 29,462 (8,043) 10,368 (2,830) 4,320 (1,179) 12,960 (3,538) 37,029 (10,109) 12,960 (3,538) 6,048 (1,651) 18,144 (4,953) 46,523 (12,701) 2 VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin

3 Table 3: Nominal Flow Capacities, scim (ml/s) VGA Series Pneumatic Three-Way Air Switching Valve With 3/8 in. Compression Adaptors 1/2 in. Internal NPT on All Ports (No Adaptors) Dimensions Supply Pressure: 30 psig (207 kpa) Pressure Drop (psi) ,616 (1,533) 2,592 (708) 7,344 (2,005) 22,032 (6,015) 8,208 (2,241) 3,456 (943) 10,368 (2,830) 32,141 (8,774) 11,664 (3,184) 4,752 (1,297) 14,688 (4,010) 41,966 (11,457) 16,416 (4,482) 7,344 (2,005) 19,872 (5,425) 50,954 (13,910) Figure 2: Split-Clamp Mounting Bracket Dimensions, in. (mm) Figure 3: VGA Series Pneumatic Three-Way Air Switching Valves (Shown are Barbed Adapters for 1/2 in. O.D. ) Dimensions, in. (mm) Table 4: VGA Series Pneumatic Three-Way Air Switching Valve Dimensions, in. (mm) Code Number Adapter Fitting Configuration A B C VGA8A2GT+3008E With for 1/2 in. O.D. 4-7/8 (124) 2-15/16 (75) 9-5/8 (244) VGA8B2GT+3008E With for 3/8 in. O.D. 4-13/16 (122) 2-7/8 (73) 9-9/16 (243) VGA8C2GT+3008E With Compression Adaptors for 1/2 in. O.D. or Copper Tubing 5-7/16 (138) 3-3/16 (81) 10-3/16 (259) VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin 3

4 Installation All VGA Series Pneumatic Three-Way Air Switching Valves are furnished with a split-clamp mounting bracket for surface mounting in an upright position. To mount the air switching valve, proceed as follows. 1. Choose a suitable mounting location which would allow sufficient clearance for actuator removal. 2. Using the split-clamp mounting bracket provided as a template, mark the two mounting hole locations on the surface. 3. For drywall or concrete mounting surfaces, drill a 3/16 in. (5 mm) hole at each of the marked locations. An F Anchor Kit (includes 100 screws, 100 anchors, and a drill bit for concrete surfaces) must be ordered separately to make the installation. For all other mounting surfaces, drill a pilot hole at each of the marked locations for No. 10 or No. 12 thread-forming screws (field furnished). 4. Secure the mounting bracket to the surface. 5. Install the valve into the mounting bracket, securing the bracket around the N.O. body adaptor (as illustrated in Figure 1). 6. Make the appropriate air connections to the valve, ensuring that the valve is piped with the flows in the directions indicated by the arrows cast into the valve body. 7. Attach the control air line to the barbed fitting on the actuator to complete the installation.! WARNING: Risk of Personal Injury. Disconnect the control air line before servicing the actuator and valve assembly. Failure to do so may result in severe personal injury. AVERTISSEMENT : Risque de blessure. Déconnecter la conduite de pression pneumatique de régulation avant toute intervention sur l'ensemble actionneur/vanne. Le non-respect de cette précaution risque de provoquer des blessures graves. H N COM N.O. VGA Series Air Switching Valve S COM S Figure 4: Typical Application Using VGA Series Pneumatic Three-Way Air Switching Valve 4 VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin

5 Ordering Information Table 5: Selection Chart Code Number Description Ship. Wt. lb (kg) VGA8A2GT+3008E VGA8B2GT+3008E VGA8C2GT+3008E With for 1/2 in. O.D. With for 3/8 in. O.D. With Compression Adaptors for 1/2 in. O.D. 1 or Copper Tubing 4.3 (2.0) 4.3 (2.0) 4.3 (2.0) 1. A plastic ferrule F , ordered separately) and a metal insert F , ordered separately) are required at all three compression adaptor connections when using polytubing. Table 6: Accessories for VGA Valves Code Number Description Ship. Wt. lb (kg) V Actuator Complete 1.1 (0.49) Ring Pack Packing Kits: VG Single-Pack 0.08 (0.04) VG Spring Kit 0.5 (0.23) V Actuator Set Screw (10-32 x 1/2 UNF-2A; Order in Multiples of 10) 0.01 (0.005) V Replacement Split-Clamp Mounting Bracket 0.5 (0.23) Table 7: Cross Reference Adaptor Fitting Configuration (All Three Ports) Johnson Controls VGA8x2GT+3008E Landis & Gyr Powers Discontinued Johnson Controls Repair Information for 1/2 in. O.D. for 3/8 in. O.D. If the VGA Series Three-Way Air Switching Valve fails to operate within its specifications, replace the unit. For a replacement valve, contact the nearest Johnson Controls representative. Compression Adaptors for 1/2 in. O.D. or Copper Tubing VGA8A2GT+3008E VGA8B2GT+3008E VGA8C2GT+3008E V VTA-1M V VTA-2M VP ,2 VP ,2 VTA-3M To ensure similar flow capabilities, it is recommended that the existing adapter fittings be reused with the replacement VGA Series Three-Way Air Switching Valve. 2. Changeout requires piping modifications. VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin 5

6 Technical Specifications VGA Series Pneumatic Three-Way Air Switching Valves Nominal Spring Range Switchover 9 to 13 psig (62 to 90 kpa) With Control Pressure Change of 0/15 psig (0/103 kpa) or 0/20 psig (0/138 kpa) Switchover Point Approximately 13 psig (90 kpa) Valve Body Meets Requirements of ANSI B16.15, Class 250 Pressure/Temperature Rating Maximum Input Pressure Valve 125 psig (861 kpa) Actuator 30 psig (207 kpa); Air Supply Must Be Clean, Dry, and Oil-Free Leakage 0.01% of Maximum Flow per ANSI/FCI 70-2, Class 4 Control Signal Air Connection 1/8 in. External NPT Barbed Fitting for 5/32 or 1/4 in. O.D. Effective Diaphragm Area 8 sq in. (5,160 sq mm) Normal Position Upper Closed Control Signal Opens Port Lower Open Control Signal Closes Port Ambient Temperature Limits -10 to 150 F (-23 to 66 C) Materials Body Cast Bronze Bonnet Brass Stem 316 Stainless Steel Plug Brass Against Molded Elastomerick Disk Packing Self-Adjusting EPR (Ethylene Propylene Rubber) Ring Pack U-Cups Actuator Die-Cast Aluminum The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. European Single Point of Contact: NA/SA Single Point of Contact: APAC Single Point of Contact: JOHNSON CONTROLS WESTENDHOF ESSEN GERMANY JOHNSON CONTROLS 507 E MICHIGAN ST MILWAUKEE WI USA JOHNSON CONTROLS C/O CONTROLS PRODUCT MANAGEMENT NO. 22 BLOCK D NEW DISTRICT WUXI JIANGSU PROVINCE CHINA Building Efficiency 507 E. Michigan Street, Milwaukee, WI Metasys and Johnson Controls are registered trademarks of Johnson Controls, Inc. All other marks herein are the marks of their respective owners Johnson Controls, Inc. 6 VGA Series Pneumatic Three-Way Air Switching Valves Product Bulletin Published in U.S.A.