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manufactured in the usa

PureFlex® Fluoropolymer Lined Butterfly Valve, 800 Series

The PureFlex® 800 series fully lined composite butterfly valve is manufactured to be corrosion resistant inside and out in hostile services. The Durcor® valve body has the strength of steel with ½ the weight and is 10× more impact resistant than standard FRP. They are used for shut-off and throttling of most known corrosive fluids, and have the purity required for ultra-pure applications. The 800 series butterfly valve can be used for end of the line service and is bubble tight at full rated pressure of 150psi, has triple stem seals and can operate at temperatures of -60ºF to +250ºF.

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Product Features & Benefits

  • STRENGTH OF STEEL: It has tensile and compressive strengths that rival steel along with outstanding impact resistance that is unmatched in the industry.
  • ADVANCED FIBER REINFORCED COMPOSITE BODY: The Durcor® valve body, manufactured from an advanced fiber reinforced composite, enables the 800 series to maintain ASME face to face dimensions, be direct threaded for lug design and allows it to be installed in any type of piping system without the need for special considerations.
  • WITHSTANDS AGGRESSIVE CHEMICALS: The Durcor® vinyl ester backbone provides excellent protection when exposed to aggressive chemicals and hostile atmospheres such as acid sprays, bleach, salt water and high chlorides.
  • LIGHTWEIGHT ADVANTAGE: The lightweight advantage of the 800 series butterfly valve reduces the need for heavier support structures for hanging, eliminates the need for extra equipment, personnel for valve installation and reduces pipe strain once installed.
  • BUBBLE TIGHT: The valve is bubble tight at full rated pressure of 150psi, has triple stem seals for unmatched leak free dependability, and can operate at temperatures between -60°F to +250°F (consult customer service for higher temperature applications).
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  • (1) Composite Durcor® valve body is light weight, provides maximum external corrosion protection, tensile and impact resistance.
  • (2) PTFE seat is .125" nominal thickness and is recessed into body, seat is energized by one-piece non-wetted elastomer providing bubble tight sealing.
  • (3) Once piece 316 S.S. disc & Stem provides high Cv valve. blow-out protection and has double "D" shaft drive, can be lined with PFA / UHMWPE or unlined.
  • (4) Mounting Flange is ISO 5211 compliant.
  • (5) NPT connections (optional) for purge or leak detection, inert gas pad or sealing lubrication port.
  • (6) PTFE composite bearing (top & bottom) is self-lubricating, reduces friction and is maintenance free.
  • (7) Triple stem seals top and bottom.
  • (7a) 304 S.S. coil springs keep preload on stem seal and taper ring.
  • (7b) 304 S.S. tapered ring compresses energized PTFE liner onto locking barbs, creates tortuous no leak path.
  • (7c) Locking barbs molded or machined onto disc stem.
  • (7d) Stem seal is created through an interference fit as the stem is passed through the body liner.
  • (7e) Primary seal is achieved at the disc hub and liner (ball & socket) through preloaded force.
  • (8) Bottom heavy hex fasteners eliminate exposure to leaks from overhead equipment. PTFE coated B7 standard. Other materials available.
  • (9) Flange Wafer or Lug design with composite threads 250ft pound pull – out strength. Alloy inserts available. 

Technical Details

    Materials

    800 Series Valve Parts List

    Item Description Standard Material Qty.
    1 Upper Body Durcor® 1
    2 Lower Body Durcor® 1
    3 Atmospheric Seal Viton® ( FKM ) 1
    4 Socket Head Cap Screw Gr. B7 ASTM A193-PTFE Coated 4
    5 ISO Mounting Flange Durcor® 1
    6 Bearing PTFE-Composite 2
    7 Coil Spring 304 Stainless Steel 2
    8 Taper Ring 304 Stainless Steel 2
    9 Seat Energizer Silicone 1
    10 Seat PTFE 1
    11 Disc PFA \ ENC DCI 1
    12 Stem Extension (4" & 6" Sizes Only) Gr. B7 ASTM A193-PTFE 1
    13 Hex Head Cap Screw CF8M Stainless Steel 2

    Valve Options

    Item Optional Material
    4 Gr. B840 ASTM A193 Stainless Steel
    Hastelloy® C276 ASTM B574
    9 Viton®
    10 UHMWPE
    TFM \ NXT PTFE
    11 UHMWPE \ Stainless Steel
    CF8M Stainless Steel
    CW6M (Hastelloy® C276) ASTM A494
    Titanium Gr. C-2 ASTM B367
    12 Gr. B840 ASTM A193 Stainless Steel
    Hastelloy® C276 ASTM B574
    13 CW6M (Hastelloy® C276) ASTM A494
    Titanium Gr. C-2 ASTM B367

    Dimensions & Weights

    Size
    in.
    (mm)    		 A
    in.
    (mm)    		 B
    in.
    (mm)    		 C
    in.
    (mm)    		 D
    in.
    (mm)    		 E
    in.
    (mm)    		 F*
    in.
    (mm)    		 Shaft ISO Flange Wafer Lug O
    in.
    (mm)    		 P
    in.
    (mm)    		 Weight
    lb.
    (mm)
    G
    in.
    (mm)    		 H
    in.
    (mm)    		 J
    in.
    (mm)    		 K
    in.
    (mm)    		 L
    in.
    (mm)    		 M
    in.
    (mm)    		 N
    in.
    (mm)    		 N
    in.
    (mm)
      NOTE:*Lined piping which exceeds the liner thickness specification of ASTM F1545 may require spacers to avoid disc swing.
    **12" valve size only, the operator mounting holes are offset 15° on ISO 5211 F12 bolt circle. (See Above.)
    2
    (50.8)    		 8.781
    (223)    		 8.250
    (209.6)    		 5.531
    (140.5)    		 3.609
    (91.7)    		 0.469
    (11.9)    		 2.063
    (52.4)    		 1.313
    (33.3)    		 0.625
    (15.9)    		 0.439
    (11.2)    		 0.438
    (11.1)    		 4.021
    (102.1)    		 0.500
    (12.7)    		 0.750
    (19.1)    		 5/8-11 4.750
    (120.7)    		 1.688
    (42.9)    		 6
    (2.7)
    3
    (76.2)    		 10.063
    (255.6)    		 9
    (228.6)    		 6.313
    (160.3)    		 5
    (127)    		 0.689
    (17.5)    		 2.594
    (65.9)    		 1.313
    (33.3)    		 0.625
    (15.9)    		 0.439
    (11.2)    		 0.438
    (11.1)    		 4.021
    (102.1)    		 0.875
    (22.2)    		 0.750
    (19.1)    		 5/8-11 6
    (152.4)    		 1.813
    (46)    		 9
    (4.1)
    4
    (101.6)    		 11.313
    (287.3)    		 10.250
    (260.4)    		 6.813
    (173)    		 6
    (152.4)    		 1
    (25.4)    		 3.469
    (88.1)    		 1.313
    (33.3)    		 0.625
    (15.9)    		 0.439
    (11.2)    		 0.438
    (11.1)    		 4.021
    (102.1)    		 0.875
    (22.2)    		 0.750
    (19.1)    		 5/8-11 7.500
    (190.5)    		 2.063
    (52.4)    		 14
    (6.3)
    6
    (152.4)    		 14.094
    (358)    		 12.219
    (310.4)    		 8.063
    (204.8)    		 8.250
    (209.6)    		 1.875
    (47.6)    		 5.500
    (139.7)    		 1.313
    (33.3)    		 1
    (25.4)    		 0.836
    (21.2)    		 0.438
    (11.1)    		 4.021
    (102.1)    		 1.500
    (38.1)    		 0.875
    (22.2)    		 3/4-10 9.500
    (241.3)    		 2.219
    (56.4)    		 25
    (11.3)
    8
    (203.2)    		 17.188
    (436.6)    		 15.375
    (390.5)    		 8.438
    (214.3)    		 10.250
    (260.4)    		 2.689
    (68.3)    		 7.375
    (187.3)    		 1.313
    (33.3)    		 1
    (25.4)    		 0.836
    (21.2)    		 0.438
    (11.1)    		 4.021
    (102.1)    		 1.500
    (38.1)    		 0.875
    (22.2)    		 3/4-10 11.750
    (298.5)    		 2.375
    (60.3)    		 34
    (15.3)
    10
    (254)    		 21.094
    (535.8)    		 18.813
    (477.8)    		 12.313
    (312.7)    		 12.250
    (311.2)    		 3.625
    (92.1)    		 9.563
    (242.9)    		 1.750
    (44.5)    		 1.375
    (34.9)    		 1.000
    (25.4)    		 0.563
    (14.3)    		 4.921
    (125)    		 1.500
    (38.1)    		 1
    (25.4)    		 7/8-9 14.250
    (362)    		 2.688
    (68.3)    		 52
    (23.4)
    12
    (304.8)    		 23.750
    (603.3)    		 21
    (533.4)    		 13.313
    (338.1)    		 14.375
    (365.1)    		 4.438
    (112.7)    		 11.563
    (293.7)    		 2.125
    (54)    		 1.375
    (34.9)    		 1.000
    (25.4)    		 0.563**
    (14.3)    		 4.921
    (125)    		 1.500
    (38.1)    		 1
    (25.4)    		 7/8-9 17
    (431.8)    		 3.094
    (78.6)    		 65
    (29.3)

    Wafer and Lug Valves with Gear

    Size
    in.
    (mm)    		 A
    in.
    (mm)    		 B
    in.
    (mm)    		 C
    in.
    (mm)    		 D
    in.
    (mm)    		 E
    in.
    (mm)    		 F
    in.
    (mm)
    2 — 4
    (50.8)(101.6)    		 6.250
    (158.7)    		 5
    (127)    		 2.578
    (65.5)    		 1.109
    (28.2)    		 2.063
    (52.3)    		 6
    (152.4)
    6 — 8
    (152.4)(203.2)    		 6.750
    (171.4)    		 5
    (127)    		 2.578
    (65.5)    		 1.109
    (28.2)    		 2.063
    (52.3)    		 8
    (203.2)
    10 — 12
    (254)(304.8)    		 7.250
    (184.1)    		 6.719
    (170.7)    		 2.984
    (75.7)    		 1.375
    (34.8)    		 2.500
    (63.5)    		 12
    (304.8)

    Fasteners for Installation of Lug Bodies

       
    Valve Size 2 3 4 6 8 10 12
    Number of Fasteners 8 8 16 16 16 24 24
    Thread Call-out 5/8 - 11 UNC 3/4 - 10 UNC 7/8 - 9 UNC
    "A" Length of Fastener 1-1/2 1-3/4 1-3/4 2 2-1/4 2-1/2 2-1/2

    Fasteners for Installation of Wafer Bodies

       
    Valve Size 2 3 4 6 8 10 12
    Number of Fasteners 4 4 8 8 8 12 12
    Thread Call-out 5/8 - 11 UNC 3/4 - 10 UNC 7/8 - 9 UNC
    "B" Length of Fastener 5 5-1/2 5-3/4 6-1/2 6-3/4 7-3/4 8-1/4

    Technical Data

    Cv at Disc Angle of Rotation

    Cv Data

    Valve SizeFull Open Cv
    2"112
    3"334
    4"570
    6"1415
    8"3110
    10"5223
    12"7944

    Disc Rotation (Degrees)

    Disc Position (degrees)Percent of Total Cv
    200
    303
    409.1
    5016.3
    6027.4
    7047
    8074.5
    90100
    Refer to chart above

    Sizing Torques - Clean Clear Fluids

    Valve Size Max. Differential Pressure
    PTFE UHMWPE
    2" 275 in.- lbs. 405 in.- lbs.
    3" 380 in.- lbs. 463 in.- lbs.
    4" 570 in.- lbs. 2,300 in.- lbs.
    6" 1250 in.- lbs. 3660 in.- lbs.
    8" 1660 in.- lbs. 4116 in.- lbs.
    10" 3600 in.- lbs. 6915 in.- lbs.
    12" 4800 in.- lbs. 8102 in.- lbs.
    Note: For slurries, add 35% to above values

    Pressure Rating

    Specifications

    • SIZES: 2” to 12” (Flanged Wafer and Lug Body)
    • PRESSURE: Full Vacuum to 150 psi
    • TEMPERATURE: -60°F to +250°F
    • FLOW: Bi-Directional
    • CONFORMANCE: Conforms to all applicable standards API 609, DIN, 3203, ISO 5752 and BS EN593
    • FLANGE ADAPTABILITY: ASME B16.5 Class, 150 Drilling Class B16.1 Class 125, Other Flange Drilling are available (Consult customer service for higher temperature ratings)
    • LINERS: UHMWPE, PTFE/PFA
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    Literature

    Certifications

    Certified to ISO 9001:2015
    CRN
    PED CE 573270 Certified
    PED UKCA 768591 Certified
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