GWC Italia. Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT SLAB & PARALLEL EXPANDING GATE VALVES PGV-1002

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1 GWC Italia Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT SLAB & PARALLEL EXPANDING GATE VALVES PGV-1002

2 GWC ITALIA Proven technology for individual valve solutions worldwide GWC Italia Worldwide Network italy group HEADQUARTERS, PRODUCTION & SALES GWC Italia, SpA Via A. Grandi, Trezzo Sull Adda Milano, Italy Phone: Fax: sales@gwcitalia.com California Italia China U.A.E. 2 USA Headquarters PRODUCTION & SALES GWC USA, Inc Crippen Street Bakersfield, CA ph: fax: sales@gwcitalia-usa.com SALES GWC Valve & Controls DMCC, Dubai 1506, Platinum Tower I-Cluster, Jumeirah Lake Towers Dubai UAE ph: sales@gwcitalia.com PRODUCTION & SALES GWC Valve Manufacturing (Shanghai) Co., Ltd. No 3600 Jihe Rd, Huaxin Town, Qingpu, Shanghai , China ph: fax: sales@gwcitalia.com

3 w w w. g w c i t a l i a. c o m GWC Italia SpA with its Headquarters in Milan, Italy designs, manufacturers and markets valves with one of the most extensive lines you will find in the Industry today. GWC Italia SpA which is founded by an Italian Group & USA Entrepreneurial Management team, has become the Parent Company of the long standing GWC Worldwide Companies. This Italian & USA team has a history of building and managing successful valve manufacturing companies over the past 40 years. The valves manufactured in Italy will be complementary to the existing GWC line consisting of diversified flow control packages in a variety of alloys, trims, configurations, sizes and pressure classes, from general to severe applications. GWC Valves are used in major applications for Upstream, Downstream & Transportation Segments of the Oil & Gas Industry, E&P, Petrochemical, Chemical, Mining/Minerals, Power, Marine and Industrial markets. GWC Italia SpA extensive line of valve and flow control products include: n Trunnion Mounted Ball Valves (soft & metal seated) n Split Body n Top Entry n Welded Body n Subsea n Cryogenic & High Temperature n Two Balls One Body DBBV n Pipeline Gate and Check Valves n Floating Ball Valves n Gate, Globe and Check Valves including Cast & Forged n Butterfly Valves including Triple Offset, High Performance and Resilient Seated n Dual Plate Check Valves n Needle and Gauge Valves n Wellhead Gate Valves GWC Italia Spa products are designed, engineered and manufactured to exceed its customer s stringent process requirements including API 6D, API 6A, API 6DSS, API 600, API 602, API 608, ISO 9001, PED, ATEX, SIL 3 and TA Luft. Proven technology for individual valve solutions worldwide CERTIFICATIONS & STANDARDS American Standards American Petroleum Institute API-6D Specification for Pipeline Valves API-6D SS Specification for Subsea Pipeline Valves API-6A Specification for Wellhead and Christmas Tree Equipment API-6FA Specification for Fire Test for Valves API-594 Check Valves: Wafer, Wafer-Lug, and Double Flanged Type API-598 Valve Inspection and Testing API-600 Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries API-602 Compact Steel Gate Valves- Flanged, Threaded, Welding and Extended-Body Ends API-607 Fire Test for Soft-Seated Quarter-Turn Valves API-608 Metal Ball Valves - Flanged, Threaded, and Welding End API-609 Butterfly Valves: Double Flanged, Lug and Wafer-Type API-Q1 Specification for Quality Programs for the Petroleum, Petrochemical & Natural Gas American Society of Mechanical Engineers ASME-B Pipe Threads, General Purpose (inch) ASME-B16.11 Forged Fittings, Socket-Welding and Threaded ASME-B16.10 Face to Face and End to End Dimensions of Valves ASME-B16.5 Pipe Flanges and Flanged Fittings NPS 1/2 ~ NPS 24 ASME-B16.47 Large Diameter Steel Flanges NPS 26 ~ NPS 60 ASME-B16.25 Buttwelding Ends ASME-B16.34 Valves - Flanged, Threaded and Welding End International Standards ISO 9001:2008 Quality Management Systems ISO Environmental Management OHSAS 18001:2007 Occupational Health and Safety Management System ISO/TS Petroleum, Petrochemical and Natural Gas Industries - Sector Specific Quality Management Systems CE/PED Pressure Equipment Directive CU-TR Technical Reglament Conformity Certificate TRCU CRN Canadian Registration Number Z Pipeline Steel Valves ATEX European for explosive atmosphere SIL3 Measurement of performance required for safety instrument function 3

4 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT SLAB GATE VALVE features Main Features Slab Gate Valve n Full bore for pigging / reduced pressure drop n Bi-directional n Pressure / spring / energized O-ring assisted seats for high / low pressure sealing n Seat sealing faces are not in the flow path n Single piston effect seats for internal cavity pressure relief n Double block and bleed capabilities n Sealant injectors for seats / stem Commonly Used Applications n Oil and gas industry n Power and mining industry n Offshore / Onshore applications n Sub-sea applications n Double block and bleed applications n Scrapers / Pig Traps / Pig Launchers and Receivers n Upstream gas compressor isolation n Critical and primary isolation 4

5 w w w. g w c i t a l i a. c o m API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE features Main Features Parallel Expanding Gate Valve n Full bore for pigging / reduced pressure drop n Bi-directional n Mechanically assisted expanding gate for positive high / low pressure sealing n Seat sealing faces are not in the flow path n Optional internal / external by-pass system for internal cavity pressure relief n Double block and bleed capabilities n Sealant injectors for seats / stem Commonly Used Applications n Oil and gas industry n Power and mining industry n Offshore / Onshore applications n Sub-sea applications n Double block and bleed applications n Scrapers / Pig Traps / Pig Launchers and Receivers n Upstream gas compressor isolation n Critical and primary isolation 5

6 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT SLAB GATE VALVE Slab Gate Valve Design Stem Bonnet stud and nut Floating seat with energized O-ring provides constant contact with gate Bonnet Gate Body Full-bore, through-conduit design reduces turbulence and pressure drop 6

7 w w w. g w c i t a l i a. c o m API 6D THROUGH CONDUIT SLAB GATE VALVE standard features Standard Features and Benefits 1. Seats / Fire-Safe Design (See Figure A) Depending upon the service of the valve, the seats can be supplied with soft seat inserts / hard face deposited metal seats. The line pressure / springs / energized O-rings, assists the single piston effect designed seats for high / low pressure sealing against the slab gate face, ensuring that a tight seal is formed. The soft seats and the seat pockets have been designed to be fire-safe. During a fire, the soft seats can be destroyed. As the seats are being slowly burnt, the upstream pressure forces the slab gate against the downstream seat. The downstream seat is thereby forced against the back of the seat pocket. The downstream seat is now forming a metal-to-metal seal with the back of the seat pocket face. When the soft seats have been fully burnt, the metal face of the seat now forms a metal-to-metal seal with the slab gate. Metal seated seats are firesafe by design. 2: Double Block and Bleed (See Figure A) The double block feature is the result of the two seats sealing against the slab gate, with the valve in the fully closed position, whether the line is under pressure or not. When there is no pressure on either side of the seats, the springs / energized O-rings force the seats to form a tight seal on the upstream / downstream sides of the slab gate. When there is pressure in the line, the upstream pressure forces the slab gate against the downstream seat, whilst also forcing the upstream seat against the slab gate, due to the single piston effect design of the seats. This has now formed a tight seal or double block on both sides of the slab gate. With the slab gate now tightly sealed on both sides, the vent / drain plug in the body can be released which will bleed the body cavity of pressure. This feature allows the draining of the cavity to remove debris / take a sample of the medium / test the sealing integrity of the seats. 3: Automatic Cavity Relief (See Figure B) Should the pressure in the body cavity exceed the line pressure, due to thermal expansion caused by an internal / external heat source, the greater cavity pressure will push the seat off the slab gate face allowing the excess cavity pressure to be vented into the line. This feature ensures that there is pressure equilibrium between the line and body cavity, which prevents the body material becoming overstressed. 4: Seat Sealant Injection (See Figure C & D) Due to possible damage of the seats by debris in the line / stem O-ring failure due to a prolonged service, there can be leakage from these areas. To extend the service life of the valve until the valve can be removed from the line for repair, a sealant can be injected through the seat / stem injection fittings. Figure A Figure B Figure C Figure D 7

8 GWC ITALIA Proven technology for individual valve solutions worldwide model 81 through conduit slab gate valve 8 Section A-A Detail B

9 w w w. g w c i t a l i a. c o m standard parts and materials Item Description Carbon Steel -20 F to 250 F [-29 C to 121 C] Carbon Steel Low Temperature -50 F to 250 F [-46 C to 121 C] 1 Body A216 WCB/WCC A352 LCB/LCC 2 Bonnet A216 WCB/WCC A352 LCB/LCC 3 Slab Gate A515 Gr.70 or A105N/ENP A350 LF2/ENP 4 Seat Ring A105N/ENP A350 LF2/ENP 5 Seat Insert RPTFE RPTFE 6 Stem A182 F6A A182 F6A 7 Yoke A216 WCB/WCC A352 LCB/LCC 8 Stem Cover ANSI 1020 ANSI Indication Rod SS304 SS Drain & Vent SS304 SS Stem Sealant Fitting SS304 SS Seat Sealant Fitting SS304 SS Upper V-Type Packing Braided Graphite Braided Graphite 14 Lantern Ring A182 F6A A182 F6A 15 Lower V-Type Packing Braided Graphite Braided Graphite 16 Bonnet Gasket SS304 + Graphite SS304 + Graphite 17 Bonnet Stud A193 B7M A320 L7M 18 Bonnet Nut A194 2HM A194 7M 19 Yoke Stud A193 B7M A320 L7M 20 Yoke Nut A194 2HM A194 7M 21 Indication Rod Nut SS304 SS Seat O-Ring HNBR PTFE 23 Indication O-Ring HNBR PTFE 24 Gear Operator Cast Iron Cast Iron 25 Gear Operator Bolt A193 B7M A320 L7M 26 Stem Nut AL-Bronze AL-Bronze 27 Bearing Housing A216 WCB/WCC A352 LCB/LCC 28 Thrust Bearing AISI 1070 AISI Hand Wheel Nut AISI 1020 AISI Stem Nut O-Ring HNBR PTFE 31 Hand Wheel Ductile Iron Ductile Iron *We reserve the right to make changes to materials and specifications 9

10 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE Parallel Expanding Gate Valve Design Stem Bonnet stud and nut Body Bonnet Parallel Expanding Gate Gate centralizer provides positive control for improved operation Full-bore, throughconduit design reduces turbulence and pressure drop 10

11 w w w. g w c i t a l i a. c o m API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE standard features Standard Features and Benefits 1: Seats/Fire-Safe Design (See Figure A) Depending upon the service of the valve, the seats can be supplied with soft seat inserts / hard face deposited metal seats. As the sealing action of the valve is mechanically activated, line pressure is not required to force the seats against the expanding gate. Therefore, the seats are of a very basic, but rugged design. The soft seats and the seat pockets have been designed to be fire-safe. The sealing action of the fire-safe design is the same as that of the slab gate valve. Metal seated seats are fire-safe by design. Figure A 2. Double Block and Bleed (See Figure A) The double block feature is the result of the two seats sealing against the expanding gate, with the valve in the fully closed position, whether the line is under pressure or not. When there is no pressure on either side of the seats, the springs / energized O-rings force the seats to form a tight seal on the upstream / downstream sides of the expanding gate. When there is pressure in the line, the upstream pressure forces the expanding gate against the downstream seat, whilst also forcing the upstream seat against the expanding gate, due to the single piston effect design of the seats. This has now formed a tight seal or double block on both sides of the expanding gate. With the expanding gate now tightly sealed on both sides, the vent / drain plug in the body can be released which will bleed the body cavity of pressure. This feature allows the draining of the cavity to remove debris / take a sample of the medium / test the sealing integrity of the seats. Figure C Figure- C 3. Sealant Injection (See Figure C & D) Due to possible damage of the seats by debris in the line / stem O-ring failure due to a prolonged service, there can be leakage from these areas. To extend the service life of the valve until the valve can be removed from the line for repair, a sealant can be injected through the seat / stem injection fittings. Figure D 11

12 GWC ITALIA Proven technology for individual valve solutions worldwide model 82 Through Conduit Parallel Expanding Gate Valve Section A-A Centralizer Detail B 12

13 w w w. g w c i t a l i a. c o m standard parts and materials Item Description Carbon Steel -20 F to 250 F [-29 C to 121 C] Carbon Steel High Temperature -20 F to 650 F [-29 C to 343 C] Carbon Steel Low Temperature -50 F to 250 F [-46 C to 121 C] 1 Body A216 WCB/WCC A216 WCB/WCC A352 LCB/LCC 2 Bonnet A216 WCB/WCC A216 WCB/WCC A352 LCB/LCC 3 Expanding Gate A216 WCB/WCC/ ENP A216 WCB/WCC + HF-6 Hard Faced A352 LCB/LCC/ENP 4 Seat Ring A105N/ENP A105N/ENP A350 LF2/ENP 5 Seat Insert/ Seal Surface RPTFE A105N + HF-6 Hard Faced RPTFE 6 Stem A182 F6A A182 F6A A182 F6A 7 Yoke A216 WCB/WCC A216 WCB/WCC A352 LCB/LCC 8 Stem Cover ANSI 1020 ANSI 1020 ANSI Indication Rod SS304 SS304 SS Drain & Vent SS304 SS304 SS Stem Sealant Fitting SS304 SS304 SS Seat Sealant Fitting SS304 SS304 SS Upper V-Type Packing Braided Graphite Braided Graphite Braided Graphite 14 Lantern Ring A182 F6A A182 F6A A182 F6A 15 Lower V-Type Packing Braided Graphite Braided Graphite Braided Graphite 16 Bonnet Gasket SS304 + Graphite SS304 + Graphite SS304 + Graphite 17 Bonnet Stud A193 B7M A193 B7M A320 L7M 18 Bonnet Nut A194 2HM A194 2HM A194 7M 19 Yoke Stud A193 B7M A193 B7M A320 L7M 20 Yoke Nut A194 2HM A194 2HM A194 7M 21 Indication Rod Nut SS304 SS304 SS Seat O-Ring HNBR Graphite PTFE 23 Indication Seal HNBR Graphite PTFE 24 Gear Operator Cast Iron Cast Iron Cast Iron 25 Gear Operator Bolt A193 B7M A193 B7M A320 L7M 26 Stem Nut AL-Bronze AL-Bronze AL-Bronze 27 Bearing Housing A216 WCB/WCC A216 WCB/WCC A352 LCB/LCC 28 Thrust Bearing AISI 1070 AISI 1070 AISI Hand Wheel Nut AISI 1020 AISI 1020 AISI Stem Nut O-Ring HNBR Graphite PTFE 31 Hand Wheel Ductile Iron Ductile Iron Ductile Iron 32 Centralizer ANSI 1020/ENP ANSI 1020/ENP A350 LF2/ENP 33 Centralizer Shaft SS410 SS410 SS410 * We reserve the right to make changes to materials and specifications 13

14 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE Operation Principles Figure E Figure F Figure G Closed Position: Gate Assembly Fully Expanded (See Figure E) As the gate and segment assembly are approaching the closed position, the stopper on the segment has contacted with the lower body stop, which prevents the segment from travelling any further. As the hand wheel is turned further, the main gate is forced down and against the wedge angle of the segment. This action expands the gate and segment assembly against the seats to form a tight seal. Mid Travel Position: Gate Assembly Fully Retracted (See Figure F) As the hand wheel is turned to open the valve, the gate travels up and away from the wedge angle of the segment. This action retracts the gate and segment assembly sealing force from the seats, which allows the assembly to travel freely between the seats. From the fully open to the fully closed positions, a gate centralizing mechanism holds the gate and segment assembly in the fully retracted position, to ensure that the assembly does not wedge itself between the seats. Open Position: Gate Assembly Fully Expanded (See Figure G) As the gate and segment assembly are approaching the open position, the stopper on the segment has contacted with the upper body stop, which prevents the segment from travelling any further. As the hand wheel is turned further, the main gate is forced up and against the wedge angle of the segment. This action expands the gate and segment assembly against the seats to form a tight seal to isolate the flow from the body cavity. At this position, the bore holes of the gate and segment are aligned exactly with the valve bore. 14

15 w w w. g w c i t a l i a. c o m API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE Gate Centralizer Operation Principles Figure H Figure I The main purpose of the gate centralizer is to maintain the gate and segment assembly in the fully retracted position, during the travel from open to close, to prevent any wedging action between the assembly and the seats (See Figure H) However, the gate centralizer allows the gate and segment assembly to expand at the final moment. During the travel from open to close, the gate centralizer is maintained in a parallel position with the seats by the skirt plates, which are positioned either side of the seats (See Figure I) As the gate and segment assembly are nearing the fully open / closed positions, the skirt plates allow the gate centralizer to tilt, which allows the gate and segment assembly to expand. The skirt plates also assist in aligning the gate and segment assembly with the seats (See Figure J) Figure J 15

16 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE Body Cavity Pressure Relief Figure K Figure L Due to the design of the expanding gate and seats to form a tight seal, any excess pressure build-up in the body cavity can t be self-relieved, as in the slab gate design. To relieve this body cavity pressure, 2 types of a pressure relief system can be provided on the outside of the valve body. The standard type consists of 2 needle valves, a check valve, tubing and fittings. This system relieves the body cavity pressure to the upstream side of the valve. During normal valve operation, the 2 needle valves must be kept open, so that the upstream line pressure can keep the check valve closed. When the body cavity pressure exceeds the upstream line pressure, the check valve is un-seated and the excess pressure is relieved upstream (See Figure K) The other type of pressure relief system is a safety pressure relief valve fitted on the outside of the valve body. A drilled and threaded hole connects the body cavity to the safety pressure relief valve. The safety pressure relief valve is set to relieve pressure at 1.33 times the line pressure, or as per the clients requirements (See Figure L) 16

17 w w w. g w c i t a l i a. c o m ordering guide Example: 8 Figure # A-G1-GO A G1 GO API-6D THRU CONDUIT SLAB GATE VALVE, CLASS 150, RF-FLG, A216 WCB BODY x G1 TRIM, NACE, FIRESAFE, BEVEL GEAR OPERATOR. 1. MODEL 81 API-6D THRU CONDUIT SLAB GATE VALVE 82 API-6D THRU CONDUIT EXPANDING GATE VALVE 2. RATING 15 - CLASS CLASS CLASS CLASS CLASS CLASS END CONNECTION 0 - RAISED FACE FLANGED 9 - RING TYPE JOINT FLANGED 7 - BUTT WELD X - OTHER 4. MATERIAL: BODY + BONNET A - A216 WCB B - A216 WCC C - A352 LCC D - A352 LCB 5. TRIM MATERIAL TRIM CODE BODY AND BONNET Stem Gate SEAT SEAT RING BOLTING TEMPERATAURE SERVICE G1 A216 WCB A182 F6A A105+ENP A216 WCB+ENP A515 GR.70+ENP rtfe** A105+ ENP NACE -20 F TO 250 F [-29 C TO 121 C] STANDARD G2 A216 WCC A182 F6A A105+ENP A216 WCC+ENP A515 Gr.70+ENP rtfe** A105+ ENP NACE -20 F TO 250 F [-29 C TO 121 C] STANDARD G3* A216 WCB A182 F6A A216 WCB+ ST-6-OVERLAY A105+ ST-6 OVERLAY A105+ ENP NACE -20 F TO 650 F [-29 C TO 343 C] HIGH TEMPERATURE G4* A216 WCC A182 F6A A216 WCB+ ST-6-OVERLAY A105+ ST-6 OVERLAY A105+ ENP NACE -20 F TO 650 F [-29 C TO 343 C] HIGH TEMPERATURE G5 A352 LCC A182 F6A A350 LF2+ENP rtfe** A350 LF2+ ENP NACE -50 F TO 250 F [-46 C TO 121 C] LOW TEMPERATURE G6 A352 LCB A182 F6A A350 LF2+ENP rtfe** A350 LF2+ ENP NACE -50 F TO 250 F [-46 C TO 121 C] LOW TEMPERATURE *G3, G4 - Not applicable for model 81 ST-6: Stellite-6 ENP: ELECTROLESS NICKEL PLATing **SEAT: DEVLON FOR 16 CL.300 AND ABOVE; FOR 8 CL.600 AND ABOVE; FOR ALL SIZES OF CL.900 & CL OPERATOR HO - HANDWHEEL OPERATOR GO - BEVEL GEAR OPERATOR B - BARE STEM 7. SPECIAL REQUIREMENTS S - SUPPLY COMPLETE INFORMATION 17

18 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT SLAB GATE VALVE Model 81150/81300/81600/81900 Dimensions and Weights Hand Wheel and Bevel Gear Operated CLASS 150 Model dimensions Size RF RTJ BW B H HW (OPEN) W HG (OPEN) G WEIGHT inch mm in mm in mm in mm in mm in mm in mm in mm in mm in kg lbs 2" " " " " " " " " " " " " " " " "

19 w w w. g w c i t a l i a. c o m CLASS 300 Model dimensions Size RF RTJ BW B H HW (OPEN) W HG (OPEN) G WEIGHT inch mm in mm in mm in mm in mm in mm in mm in mm in mm in kg lbs 2" " " " " " " " " " " " " " " " CLASS 600 Model dimensions Size RF RTJ BW B H HW (OPEN) W HG (OPEN) G WEIGHT inch mm in mm in mm in mm in mm in mm in mm in mm in mm in kg lbs 2" " " " " " " " " " " " " " " " CLASS 900 Model dimensions Size RF RTJ BW B H HW (OPEN) W HG (OPEN) G WEIGHT inch mm in mm in mm in mm in mm in mm in mm in mm in mm in kg lbs 2" " " " " " " " " " " "

20 GWC ITALIA Proven technology for individual valve solutions worldwide API 6D THROUGH CONDUIT PARALLEL EXPANDING GATE VALVE Model 82300/82600/82900/821500/ Dimensions and Weights Hand Wheel and Bevel Gear Operated CLASS 300 Model dimensions Size RF RTJ BW B H HW W (Double) HG G (Double) Weight inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch kg lbs 2" " " " " " " " " " " " " " " "

21 w w w. g w c i t a l i a. c o m CLASS 600 Model dimensions Size RF RTJ BW B H HW W (Double) HG G (Double) Weight inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch kg lbs 2" " " " " " " " " " " " " " " " CLASS 900 Model dimensions Size RF RTJ BW B H HW W (Double) HG G (Double) Weight inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch kg lbs 2" " " " " " " " " " " "

22 GWC ITALIA Proven technology for individual valve solutions worldwide CLASS 1500 Model dimensions Size RF RTJ BW B H HW W (Double) HG G (Double) Weight inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch kg lbs 2" " " " " " " " " " " " CLASS 2500 Model dimensions Size RF RTJ BW B H HW W (Double) HG G (Double) Weight inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch mm inch kg lbs 2" " " " " " "

23 w w w. g w c i t a l i a. c o m flow coefficients (Cv) value Cv is a number measured in gallons/minute, which is calculated from the flow of water through the valve with a 1 psi pressure drop across the valve length. VALVE SIZE INCH Class 150 Class 300 Class 600 Class 900 Class 1500 Class Flow Characteristics Close to Open The graph depicts the approximate percentage of the flow coefficient (Cv) as the valve is stroked from the closed to open position. 23

24 WORLDWIDE HEADQUARTERS GWC Italia SpA Via A. Grandi, Trezzo Sull Adda Milano, Italy ph: fax: usa HEADQUARTERS GWC USA, Inc Yeager Way Bakersfield, California USA ph: fax:

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