The main body of the handle lug butterfly valve is ductile iron QT450, which can be made into CLASS150, JIS10K, EN PN16/PN10 flange connection end face
ISO 5211 standard upper flange connection plate
■ Material
The disc/seat material of the lug butterfly valve is based on different media and different working conditions, we provide different material configurations. Trekre’s professional sales engineers provide you with the most professional advice and services according to the specific requirements of customers.
■ Body: Integral cast body, lug design. For single-flange or end-of-line service, obtain the documented rating and installation instructions for the exact valve model, size, pressure class and permitted pressure direction. Do not infer that service rating from a lug body alone. The upper flange connection meets the ISO5211 standard and is compatible with direct installation of manual operation actuators and pneumatic actuators/electric actuators.
■ Valve plate: high-strength casting, the edge of the valve plate is machined spherical surface, and is hand-polished or the whole valve plate is nylon sprayed or covered with rubber, low operating torque and long service life of the valve seat. Streamlined plate profile reduces flow resistance, increases Cv values, and enhances pressure recovery.
lugged butterfly valve ANSI 150/Manual lug butterfly valve
Lug butterfly valves can be made in various colors according to customer needs
■ Valve seat: There is a water line molded into one body on the valve seat, and there is no need to add flange gaskets during installation. The valve seat is specially designed for loose flange or welded flange.
■ Stem: Through-shaft pinless and dual-shaft pinless designs are available upon request.
Relying on the structural characteristics and axial sealing design of the centerline butterfly valve, the dry shaft design feature makes the valve stem completely isolated from the medium. Confirm the shaft grade and sealing arrangement for the specified medium and operating conditions; do not select a shaft material from the dry-shaft description alone.
The connection between the valve plate and the valve stem is precisely machined to ensure that linkage hysteresis is eliminated, and all connections are designed to produce a maximum strength bond. All Trekre stems are blowout proof.
For dual-shaft pinless designs, a precise flat or square stem end to the valve plate drives the valve plate, eliminating the need for screws and pins, and the tight-fitting flat or square stem end drives the valve plate, this is Trekre unique design features.
Lug Butterfly Valve Blank/Casting
■ Bushing: Corrosion-resistant phenolic resin/PTFE bushing absorbs side thrust. Brass is also available for the bushing material.
■ Anti-Blowout Design: A retaining ring is installed between the machined stem groove and the upper seal to keep the stem in place in the event of an internal failure due to unexpected events.
■ Primary seal and secondary seal: This type of seal completely isolates the fluid medium from the valve body and stem. The primary seal is obtained by pre-compressed contact of the machined and hand-polished valve plate shoulder with the inner surface of the valve seat. The secondary seal is obtained by the interference fit of the stem and seat bore. The self-adjusting “triple O-ring” sealing design requires confirmation of sealing performance in each pressure direction and the agreed test and acceptance criteria for the selected assembly.
■ Actuator installation: Confirm the mounting flange, shaft and coupling dimensions, required torque and operating clearance of the selected lug valve and drive. Whether direct mounting is possible or a bracket is required must be checked for the actual assembly.
Handle switch lug butterfly valve with chain lock
lugged butterfly valve ansi 150
1. Confirm bidirectional sealing capability and leakage acceptance for the supplied valve configuration under the agreed test conditions.
overall design
2. The fully lined rubber valve seat completely isolates the valve body from the medium in the pipeline. The lining separates the body from the process medium in the intended construction. Confirm lining compatibility, body material and external exposure for the actual service; do not waive the material review solely because the valve is lined.
3. For the described dry-shaft construction, confirm the shaft material, sealing arrangement and compatibility with the actual medium and service conditions. The dry-shaft description alone does not establish a suitable shaft grade for every application.
4. Low operating torque.
5. Light weight, easy to install and maintain.
6. The full diameter design greatly improves the flow coefficient to meet the efficient flow of the medium in the pipe.
Product Overview
This page presents a lug butterfly valve identified with handle operation. The selected piping connection and operating arrangement should be reviewed for the intended installation.
Selection Notes
Confirm the operating medium, service conditions, lug connection requirement, selected body, disc and seat materials, handle operating arrangement and installation space before ordering.
FAQ
What should be confirmed for handle operation?
Confirm the required operating arrangement and available installation space for the selected valve configuration.
What piping information is required for the lug connection?
Provide the mating flange and piping details so the selected connection can be reviewed.
Which material details should be included in an inquiry?
Confirm the required body, disc and seat materials with the operating medium and service conditions.
Related Information
Explore Butterfly Valves, see an EPDM-lined lug example, read Valve Technical Knowledge, or learn About Trekre.