Butterfly Valve 40mm DN40 PN16 Flanged Wafer Type

Butterfly Valve 40mm DN40 PN16 Flanged Wafer Type

40mm Butterfly Valve (DN40) is a versatile valve type suitable for medium and low-pressure pipelines, widely used in industrial fluid control due to its quick opening/closing action and low fluid resistance. This specification valve complies with international standards such as GSO ISO 10631 and is applicable in various settings including water treatment, HVAC, general industrial processes, and irrigation systems. Its design operates by rotating a disc-shaped butterfly plate within the pipeline to regulate and shut off fluid flow, offering simple and efficient operation.

Common Materials and Specifications for Butterfly Valve 40mm
Common body materials include ductile iron, cast steel, stainless steel (e.g., 304, 316), and copper alloys to meet different corrosion resistance and strength requirements. The disc material can be correspondingly selected as stainless steel or nylon-coated, with the nylon-coated disc offering good wear resistance and self-lubricating properties, effectively reducing operating torque and extending service life. Seat seals commonly use Nitrile Rubber (NBR), Ethylene Propylene Diene Monomer (EPDM), or Polytetrafluoroethylene (PTFE) to achieve reliable soft sealing.

Connection, Actuation, and Pressure for Butterfly Valve 40mm
This model primarily uses wafer type or lug type connections, facilitating installation between two pipeline flanges, resulting in a short face-to-face length and light weight. The actuation method is flexible and can be equipped with a manual lever, worm gear reducer, pneumatic actuator, or electric actuator for local or automated control. Its standard pressure ratings cover PN10 and PN16, with some high-performance designs reaching PN25 or PN40 to meet different system pressure requirements. The applicable temperature range is typically between -29℃ and +180℃, depending on the seat and seal material types.

Features and Key Parameters of Butterfly Valve 40mm
A notable feature of this valve specification is its optimized flow characteristics. When fully open, the disc thickness presents minimal resistance to medium flow, resulting in low-pressure loss, which benefits energy efficiency. Its 90-degree quarter-turn operation allows for fast switching, facilitating flow regulation. Furthermore, a pinless disc connection design reduces potential internal leakage points and simplifies maintenance and replacement.

Key Parameters Table for Butterfly Valve 40mm
The table below summarizes the main technical parameters of the 40mm Butterfly Valve:

COVALVE Butterfly Valve 40mm Product Certifications
The product has obtained authoritative industry certifications, ensuring its safety and reliability. The product design and testing strictly adhere to the API 609 standard. Regarding fire safety, valves can be optionally equipped with fire-safe designs that comply with the API 607 standard.

1. In a water supply system, can installing a Butterfly Valve 40mm affect the measurement accuracy of an upstream water meter?

• Yes, improper installation may have an impact. Studies indicate that if valves like butterfly valves are installed too close upstream of a water meter, they can disturb the flow field, potentially causing deviations in meter readings. To ensure measurement accuracy, it is recommended to leave sufficient straight pipe length (typically 5-10 times the pipe diameter) between the valve and the water meter and to ensure the valve is fully open during metering. Adhering to the installation guidelines provided by the water meter manufacturer is crucial.

2. How to choose the appropriate disc and seat material combination for a Butterfly Valve 40mm?

• The selection depends on the specific medium and operating conditions. For neutral media like water and air, a stainless steel disc paired with an EPDM rubber seat is a cost-effective and common choice. If the medium contains oils or requires certain chemical resistance, a Nitrile Rubber (NBR) seat is more suitable. For corrosive chemical media or applications requiring higher cleanliness, a full stainless steel body/disc with a PTFE (Polytetrafluoroethylene) seat should be selected. For slurries containing solid particles, a nylon-coated disc with better wear resistance can effectively extend valve life.

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