Specification

Top-Quality Stainless Steel Pneumatic Butterfly Valve with Double Offset Design in Wafer Type for Water Oil Gas with API 609

I. Product Overview

As a core flow regulation and shut-off device in industrial pipeline systems, the Newway stainless steel pneumatic double-offset wafer-type butterfly valve features a double-offset structure, constructed from 304/316 stainless steel and driven by a pneumatic actuator for 0~90° rotational control. With a diameter range of DN80~DN600 (3″~24″) and pressure ratings of 150Lb~300Lb (PN10~PN40), it stably manages the flow of water, oil, gases, and other media within -29°C~120°C. Complying with international and domestic standards such as API 609 and TSG special equipment manufacturing license, it serves as an ideal choice for petrochemical, water supply/drainage, energy, and environmental protection sectors.

II. Core Features: Revolutionary Breakthrough of Double-Offset Technology

Eccentric Principle: The stem axis deviates from both the seat centerline and the disc centerline, forming double offsets. This design enables the disc to disengage from the seat rapidly when opening, reducing friction and wear by 60% compared to single-offset structures.

Seal Enhancement: When closed, the disc and seat form a three-dimensional seal pair. Combined with elastic seal materials like EPDM/NBR/PTFE, it achieves bubble-tight sealing (leakage ≤0.01% of rated flow, compliant with API 598 standards).

Torque Optimization: The double-offset design reduces opening/closing torque by 40%, with pneumatic actuation torque ≤150N·m for DN300, suitable for low-power air supply systems.

Actuator Configuration: Equipped with double-acting/single-acting pneumatic piston actuators, response time ≤0.8 seconds (DN100), supporting 4~6bar air pressure.

Control Integration: Optional accessories include positioners, solenoid valves, and limit switches, enabling 4~20mA analog regulation or on/off control, compatible with DCS/PLC systems.

Safety Design: Single-acting actuators feature spring return, automatically resetting to a safe position (open/close optional) in case of air supply failure.

Material System: The valve body uses austenitic stainless steels like CF8 (304) and CF8M (316), with tensile strength ≥520MPa and 8x higher chloride corrosion resistance than carbon steel.

Surface Treatment: The inner wall is electropolished (Ra≤0.8μm), and the outer surface is sandblasted and passivated, passing salt spray tests ≥1000 hours without corrosion.

Temperature Resistance: Maintains impact toughness ≥27J in -29°C low-temperature environments and structural stability in 120°C high-temperature media.

III. Key Attributes: Technical Parameters and Standard Compliance