High Performance Pneumatic Clamp Butterfly Valve D672F

High Performance Pneumatic Clamp Butterfly Valve D672F

The high performance pneumatic clamp butterfly valve D672F is a quarter-turn isolation and throttling valve designed for pipelines that need fast pneumatic actuation and double-eccentric disc geometry in a compact wafer body. Manufactured by Trekre & Fouten Valve at our Wuxi factory, this air-driven wafer butterfly valve uses a double offset disc path to reduce seat friction during opening and closing compared with concentric rubber-seated designs. The D672F designation identifies a clamp-style wafer installation between pipeline flanges with through bolts, making it a practical choice for HVAC headers, water treatment skids, chemical transfer lines and general process piping where space between flanges is limited and pneumatic speed is required.

Compared with manual handle wafer butterfly valves, the pneumatic actuator delivers repeatable open and close cycles from a remote control panel without operator presence at the valve. Compared with triple-offset metal seated pneumatic flanged valves, the D672F high performance clamp configuration focuses on resilient or PTFE-based sealing at moderate temperature with lower breakaway torque, allowing smaller actuator sizing on the same nominal diameter. The valve suits both on-off shutoff duty and limited throttling service when a positioner is added to the pneumatic actuator package.

High Performance Pneumatic Clamp Butterfly Valve D672F Specifications

Structure and working principle

The valve body follows a wafer clamp pattern installed between companion flanges; the disc rotates around a stem supported by bearings in the body. The double eccentric (high performance) geometry places the shaft axis behind the disc centerline and offsets the disc seal path so the disc lifts away from the seat before rotation, reducing wear on the sealing element during each stroke. The pneumatic actuator connects to the stem through an ISO 5211 mounting pad on the valve top flange, allowing standardized actuator interchange.

When compressed air enters the actuator cylinder, the piston drives the stem and disc to the open or closed position depending on air port routing. Double-acting actuators use air pressure to move in both directions. Single-acting spring-return actuators use air to open and internal springs to close—or the reverse arrangement when fail-safe direction is specified. A solenoid valve pilots air to the actuator ports for remote switching. Optional accessories include air filter regulators, limit switch boxes for open/closed indication, and electro-pneumatic positioners for 4–20 mA proportional control.

Nominal size and pressure class

Standard production covers nominal diameters from DN50 to DN500 (NPS 2 to 20) in common increments. Pressure ratings typically include PN10 and PN16; ANSI Class 125 and Class 150 wafer configurations are available when the purchase specification references ASME B16.5 flange classes. Face-to-face dimensions follow EN 558 Series 20, API 609 short pattern or manufacturer standard tables for wafer bodies. Confirm the exact flange drilling, gasket type and bolt length before ordering companion flanges, because wafer valves rely on the pipeline bolt set to clamp the body between flanges.

Body, disc and seat materials

Valve body options include ductile iron GGG50 for general water and HVAC service, cast carbon steel WCB for industrial process lines, and stainless steel CF8 (304) or CF8M (316) for corrosive or hygienic-adjacent applications. The disc is typically stainless steel with optional nickel plating or surface treatment matched to the medium. Seat materials are selected for the operating medium and temperature: EPDM for water and HVAC, NBR for oil-resistant duties, VITON (FKM) for higher temperature hydrocarbon service, and PTFE or PTFE-lined disc options for chemical resistance. Stem and shaft components use stainless steel with blowout-proof retention. Upper stem packing is chosen for the temperature band—NBR or PTFE packing combinations are common on standard industrial duty.

Pneumatic actuation and control options

The valve is operated by a pneumatic actuator mounted on the ISO 5211 interface. Actuator bodies are commonly aluminum alloy with epoxy exterior coating and a visible position indicator on top. Supply air should be clean and dry, typically filtered to 40 micron and regulated to 4–7 bar unless the actuator nameplate specifies a different range. On-off service uses a four-way solenoid valve with open and closed limit feedback when specified. Modulating service adds a positioner accepting 4–20 mA or 3–15 psi signals to hold intermediate disc angles for flow trimming. Actuator sizing accounts for the breakaway torque of the selected seat material and nominal size. Limit switches and position transmitters integrate with DCS or PLC panels for remote status indication.

Applicable working conditions and industries

This high performance pneumatic clamp butterfly valve D672F is specified on building HVAC chilled and hot water loops, municipal water distribution branches, fire protection test headers where pneumatic interlocks are used, chemical dosing and transfer skids, food and beverage process lines with appropriate seat material selection, pulp and paper white water circuits, and general industrial piping where wafer footprint and pneumatic speed are both required. The double eccentric disc geometry suits clean to lightly particulate media within the seat temperature limits. For slurry or abrasive service, consult Trekre & Fouten application staff on seat and disc surface options before finalizing the specification.

Standards, inspection and delivery

Design and inspection commonly reference API 609, MSS SP-67, EN 593 or GB/T 12238 depending on the project region. Each valve undergoes shell pressure test and seat closure check before shipment. Material certificates, dimensional reports and actuator function tests can be included in the QA dossier when requested. Valves are cleaned, flange-faced protected and packed for export from Wuxi. Trekre & Fouten Valve engineers can review your medium composition, temperature profile, fail-safe requirement and control signal type to confirm body material, seat selection and actuator class.

Product parameters

Selection notes

Specify flange standard and pressure class, body and disc material, seat elastomer or PTFE type, operating temperature and cycle count, and whether the valve must modulate or operate on-off only. State fail-safe requirement—spring-return to open or closed—and control signal type when a positioner is needed. For throttling duty, provide flow requirements or allow Trekre & Fouten engineers to recommend acceptable travel range. Allow clearance for actuator height above the pipeline centerline and access for solenoid, filter-regulator and limit switch maintenance. Wafer installation requires correct bolt length and even gasket compression on both sides of the body.

Installation and maintenance guidance

Install the wafer valve between flanges with gaskets suited to the medium and flange class. Tighten flange bolts in a cross pattern to avoid body distortion. Mount the actuator upright or within the orientation limits stated on the actuator nameplate. Connect air supply through a filter-regulator; add a lubricator only when the actuator design requires it. Verify open and closed stops after installation and calibrate the positioner across the requested control range when modulating accessories are fitted. Periodically exercise the valve through partial strokes to prevent deposit buildup on the seat. Inspect stem packing for leakage during thermal cycling; adjust gland bolts within the manufacturer torque band. If closure leakage increases after extended service, evaluate seat condition and actuator torque output before replacing sealing components.

Comparison with adjacent designs

Concentric resilient seated wafer butterfly valves remain the economical choice for simple water isolation where high performance double offset geometry is not required. Lug-type pneumatic butterfly valves suit end-of-line service where downstream removal of piping is needed without disturbing the upstream flange set. Triple-offset pneumatic flanged valves address metal hard sealing at higher temperature where elastomer seats would fail. Electric actuators replace pneumatic drives when compressed air is unavailable. The D672F high performance pneumatic clamp configuration fits fast on-off or modulating duty in wafer installations where double eccentric seat life and lower operating torque improve cycle reliability compared with basic concentric designs.

This high performance pneumatic clamp butterfly valve D672F extends the Trekre & Fouten pneumatic butterfly valve range for process owners who need compact wafer mounting with air-driven remote operation. Contact our sales team with flange details, medium data, fail-safe preference and control system interface for quotation and delivery schedule from our China valve manufacturing facility.