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Home > Industrial Equipment & Components > Valve > Butterfly Valve > Slow Closing Butterfly Check Valve, Counterweight Design, Standard Compliant With Warranty

Slow Closing Butterfly Check Valve, Counterweight Design, Standard Compliant With Warranty

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Product Spotlights

Engineered with an external counterweight for controlled slow closing to eliminate water hammer. Built to API/AWWA standards with ductile iron and stainless steel construction. Features an adjustable closing mechanism for easy field tuning. Includes a manufacturer's warranty and is ISO9001 certified. Ideal for protecting water, wastewater, and industrial piping systems globally.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Application:

Other, Water Supply

Material:

Ductile Iron, Stainless Steel, Rubber Lining

Size Range:

DN50 - DN1200 (2“ - 48“)

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Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Application Other, Water Supply

Material Ductile Iron, Stainless Steel, Rubber Lining

Size Range DN50 - DN1200 (2“ - 48“)

Design Standard API 609, AWWA C504

Seat Type Resilient Seat (EPDM/NBR)

Connection Type Wafer, Lug, Flanged

Pressure Rating PN10, PN16, Class 150

Operation Slow Closing, Counterweight Assisted

Warranty Standard Manufacturer Warranty Included

As a dedicated valve manufacturer since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in engineering reliable flow control solutions for global markets. Our Slow Closing Butterfly Check Valve with Counterweight Design represents our commitment to combining innovative engineering with practical application needs. This valve is engineered to provide superior backflow prevention while minimizing water hammer and system shock, protecting your valuable pipeline infrastructure. With an annual export value demonstrating our international reach and trust, we deliver products that meet the rigorous demands of water supply, wastewater management, and industrial applications across North America, Southeast Asia, Europe, and beyond.

Core Features & Technical Advantages:

Patented Slow-Closing Mechanism: The integrated counterweight system ensures a controlled, gradual closure of the disc, drastically reducing the risk of pressure surges and destructive water hammer. This extends the lifespan of pumps, fittings, and the entire pipeline network.
Robust Construction for Longevity: Manufactured from high-grade ductile iron body with stainless steel stem and shaft. The resilient seat, available in EPDM or NBR, ensures a bubble-tight seal and excellent corrosion resistance for various media.
Versatile & Compliant Design: The valve is designed to comply with international standards such as API 609 and AWWA C504, making it suitable for a wide range of global projects. It is available in wafer, lug, and flanged connections for easy integration into existing systems.
Maintenance-Friendly Operation: The external counterweight design allows for easy adjustment of the closing speed without disassembling the valve. This feature simplifies maintenance and fine-tuning on-site, reducing downtime.
Enhanced Flow Efficiency: The streamlined butterfly disc design offers minimal flow restriction when fully open, resulting in lower pressure drop compared to traditional swing check valves, which translates to energy savings for pumping systems.

Technical Specifications & Selection Guide:

Parameter	Specification / Option
Size Range (Nominal Diameter)	DN50, DN80, DN100, DN150, DN200, DN250, DN300, DN400, DN500, DN600, DN800, DN1000, DN1200
Pressure Rating	PN10, PN16, ANSI Class 150
Body Material	Ductile Iron (GGG40/50), Cast Steel (WCB)
Disc & Stem Material	Stainless Steel (CF8/CF8M), Coated Ductile Iron
Seat Material	EPDM (for water), NBR (for oils), Optional PTFE
Connection Type	Wafer (Double Flange), Lug (Single Flange), Flanged (ASME/EN/DIN)
Temperature Range	-10°C to +120°C (EPDM), -20°C to +80°C (NBR)
Standards	API 609, AWWA C504, ISO 5211 (Flange Dimensions)

Benefits for Your Project:

System Protection: Prevents costly damage from water hammer, safeguarding pumps, meters, and pipe joints.
Operational Reliability: Ensures consistent check valve performance, preventing backflow and maintaining system integrity.
Reduced Lifetime Cost: Lower maintenance requirements and extended service life lead to a better total cost of ownership.
Global Project Compatibility: Manufactured to widely recognized standards, facilitating specification and approval for international engineering contracts.
Flexible Sourcing: Available for shipment from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics.

Backed by our ISO9001-certified manufacturing processes, every valve undergoes stringent quality checks. Our proven track record, evidenced by serving diverse markets from North America and Europe to Africa and Oceania, and an annual export value reflecting consistent quality and reliability, stands as a strong trust endorsement. The inclusion of a standard warranty provides you with added peace of mind. Choose Shanghai Zhibang's Slow Closing Butterfly Check Valve for a robust, intelligent solution that prioritizes system safety and longevity. Contact us today to discuss your specific requirements or to request detailed technical data sheets.

Frequently Asked Questions (FAQ):

Q: How does the counterweight design achieve slow closing?
A: The external counterweight acts against the force of the flowing medium. When flow stops, gravity and the counterweight work together to provide a controlled, metered closing motion, rather than a sudden slam.
Q: Can the closing speed be adjusted in the field?
A: Yes, a key advantage is the externally adjustable counterweight. By modifying its position or adding/removing weight, technicians can fine-tune the closing time to match specific system dynamics without valve disassembly.
Q: Is this valve suitable for vertical pipe installation?
A: It is primarily designed for horizontal pipeline installation to function optimally. For vertical installations, specific design considerations are needed; please consult our engineering team for guidance.
Q: What media is this valve compatible with?
A: With EPDM seats, it is ideal for potable water, wastewater, and seawater. NBR seats suit oils and fuels. Material compatibility for specific aggressive chemicals should be verified upon request.
Q: What is the lead time for larger sizes (e.g., DN600+)?
A: Standard sizes are typically available from stock. For larger, customized sizes, lead times vary. We provide accurate production schedules upon receipt of detailed inquiries.
Q: Does the warranty cover seat and disc wear?
A: The standard warranty covers manufacturing defects in materials and workmanship under normal use. Wear parts like seats have a defined service life dependent on operating conditions, which are detailed in the warranty terms.
Q: Are test reports (e.g., hydrostatic) available?
A> Yes, standard hydrostatic shell and seat leakage test reports are available and can be provided with the shipment. Additional testing per specific standards can be arranged.
Q: Can you provide valves with special coatings or linings?
A: Absolutely. We offer options like epoxy coating, rubber lining (for abrasion resistance), or other specialized internal coatings. These are customizable based on project specifications.