Economy Wafer-type Butterfly Valves (CF8/CF8/PTFE)

Economy Wafer-type Butterfly Valves (CF8/CF8/PTFE)

Categories: ,

Description

Wafer Type Butterfly Valve Technical Data Sheet

(Stainless Steel Body / PTFE Seat)

Product Name: Wafer Type Concentric Butterfly Valve
Model: D71X / D371X – Series
Date: February 16, 2026

1. Product Overview

This valve features a wafer-type body design for easy installation between pipeline flanges. The valve is constructed entirely with stainless steel wetted parts (body and disc) and a PTFE (Polytetrafluoroethylene) seat, offering excellent corrosion resistance and chemical inertness. It is ideally suited for handling aggressive media in chemical, pharmaceutical, food processing, and water treatment industries.

2. General Technical Specifications

Item Specification
Valve Type Wafer Type, Concentric (Centric) Butterfly Valve
Nominal Size (DN) DN50 ~ DN600 (2″ ~ 24″)
Nominal Pressure (PN) PN10 / PN16 / Class 150LB
Structure Style Concentric (Center line) Design
Connection Type Wafer-Type (Fits between EN 1092-2, ASME B16.5, or JIS flanges)
Temperature Range -29°C ~ +180°C (-20°F ~ +356°F)
Applicable Media Acids, Alkalis, Chemical solutions, Potable Water, Food products, Pharmaceutical fluids
Design Standard GB/T 12238 / API 609 / EN 593
Face-to-Face Dimension ISO 5752 Series 20 (Short pattern) / API 609 Category A
Pressure Testing ISO 5208 / API 598
Operation Lever Handle (DN50-150), Worm Gear (DN200-600), Electric Actuator, Pneumatic Actuator

3. Material of Parts Specification

Part Name Material / Grade Material Properties & Application
Body Stainless Steel (ASTM A351 CF8 / CF8M) Equivalent to 304 or 316 stainless steel. Excellent corrosion resistance.
Disc Stainless Steel (ASTM A351 CF8 / CF8M) Precision cast and polished disc for smooth operation and corrosion resistance.
Seat (Seal Ring) PTFE (Polytetrafluoroethylene) – Excellent chemical resistance: Inert to most acids, alkalis, and solvents.
– Low friction coefficient: Reduces torque requirements.
– Wide temperature range: Suitable for high-temperature chemical applications.
– Non-stick properties: Prevents media build-up.
Stem / Shaft Stainless Steel (SS304 / SS316) High strength, anti-corrosion.
O-Rings / Body Seals EPDM or FKM (Viton) (depending on application) Provides sealing between body and liner; selected based on media compatibility.
Bushings PTFE / Reinforced PTFE Self-lubricating, prevents stem galling.

4. PTFE Seat Characteristics

  • Chemical Resistance: PTFE is chemically inert and resistant to almost all industrial chemicals and solvents, except molten alkali metals and elemental fluorine at high temperatures.

  • Temperature Resistance: Maintains stability from sub-zero temperatures up to 180°C.

  • Low Friction: PTFE’s low coefficient of friction ensures low operating torque and extends valve life.

  • Non-Stick Surface: Precribes adhesion of media, making it ideal for viscous or sticky fluids.

  • FDA Compliance: PTFE materials can be supplied to meet FDA requirements for food and pharmaceutical applications upon request.

5. Main Technical Characteristics

  1. Concentric Design: The stem passes through the center line of the disc, which contacts the PTFE seat for sealing. Simple, reliable, and cost-effective.

  2. Full Stainless Steel Construction: All wetted parts (body, disc) are stainless steel, providing superior corrosion resistance compared to ductile iron or coated valves.

  3. PTFE Lined Seat: The seat fully lines the body bore, isolating the body from the media and ensuring bubble-tight shut-off.

  4. Wafer Type Body: The valve is centered between two pipe flanges using precision-machined locating lugs, allowing for easy installation and removal without special tools.

  5. Bi-Directional Sealing: The PTFE seat design provides tight shut-off in both flow directions.

6. Pressure-Temperature Rating (PTFE Seat)

Temperature (°C) Max. Working Pressure (PN16 / Class 150)
-29°C to +50°C 16 Bar (232 psi)
+100°C 14 Bar (203 psi)
+150°C 11 Bar (160 psi)
+180°C 8 Bar (116 psi)

Note: Pressure ratings decrease at elevated temperatures due to material properties of PTFE.

7. Principal Dimensions & Connection Data (Reference PN10/16)

*Note: Final dimensions subject to approval drawings. Conforms to ISO 5752 Series 20 / API 609 Category A.*

DN (mm) Size (inch) Face-to-Face L (mm) Body Diameter (mm) Bolt Circle Compatibility (mm) Approx. Weight (kg)
50 2″ 43 105 Fits PN10/16/Class 150 ~2.5
65 2.5″ 46 120 Fits PN10/16/Class 150 ~3.5
80 3″ 46 132 Fits PN10/16/Class 150 ~5.0
100 4″ 52 156 Fits PN10/16/Class 150 ~6.5
125 5″ 56 184 Fits PN10/16/Class 150 ~8.5
150 6″ 56 210 Fits PN10/16/Class 150 ~11.0
200 8″ 60 268 Fits PN10/16/Class 150 ~16.0
250 10″ 68 320 Fits PN10/16/Class 150 ~22.0
300 12″ 78 370 Fits PN10/16/Class 150 ~32.0
350 14″ 92 430 Fits PN10/16/Class 150 ~45.0
400 16″ 102 482 Fits PN10/16/Class 150 ~60.0

8. Applicable Standards & Testing

  • Design & Manufacture: API 609 Category A / ISO 5752 / EN 593 / GB/T 12238

  • Face-to-Face: ISO 5752 Series 20 (Short pattern)

  • Flange Compatibility: EN 1092-2, ASME B16.5 (via wafer mounting), JIS B2220

  • Testing Standard: ISO 5208 / API 598

  • Pressure Tests:

    • Shell Test: 1.5 x Rated Pressure

    • Seat Test: 1.1 x Rated Pressure (Bi-directional)

    • Leakage Rate: Rate A (No visible leakage) per ISO 5208

9. Remarks

  • This Stainless Steel + PTFE combination offers the best corrosion resistance for chemical applications.

  • PTFE seat provides low torque operation and requires no maintenance.

  • For higher temperature applications (>180°C), alternative seat materials such as RTFE or PEEK should be considered.

  • Available with various disc and body options: CF8 (304), CF8M (316), or CF3M (316L) for enhanced corrosion resistance.

  • Actuator mounting flange conforms to ISO 5211 for easy automation.

Related products