Handle Butterfly Valve

Overview of Handle Butterfly Valve​

Sikerui Handle Butterfly Valve​ is a quarter-turn rotational motion valve designed to regulate or isolate fluid flow in piping systems through a manually operated handle mechanism . It consists of a circular disc (vane) mounted on a rotating stem, which, when turned 90 degrees via an external handle, aligns parallel to the flow (open) or perpendicular to it (closed) . Manufactured from materials such as cast iron, stainless steel (304/316), brass, or PVC, these valves operate effectively across temperatures from -40°C to 180°C and pressures up to 1.6 MPa (PN16), complying with international standards including ISO 5211, ASME B16.5, and DIN 3354 . Their compact, lightweight design ensures easy installation in space-constrained applications, while the simple mechanism enables rapid shut-off or flow modulation with minimal torque . Common sizes range from DN15 to DN600 (½” to 24″), with connection types including wafer, lug, flanged, or threaded ends to suit diverse system requirements . Handle butterfly valves are widely used in water supply, HVAC, chemical processing, and fire protection systems due to their cost-effectiveness, low maintenance, and reliable performance .

Key Features of Handle Butterfly Valve​

1. Compact and Lightweight Design​
   Handle butterfly valves feature a slim profile and low weight​ (up to 50% lighter than gate or globe valves), reducing structural support needs and simplifying installation in tight spaces . The unitary body construction minimizes part count, enhancing durability while lowering overall costs .
2. Quick Quarter-Turn Operation​
   The handle enables 90-degree rotation for full open/close cycles, allowing swift flow control within seconds . This rapid action is critical in emergency shut-off scenarios or processes requiring frequent adjustments .
3. Low Pressure Drop and High Flow Efficiency​
   When fully open, the disc’s thin profile presents minimal flow obstruction, resulting in a low-pressure drop and energy savings . The streamlined flow path minimizes turbulence, making these valves ideal for high-volume applications like water distribution or HVAC systems .
4. Bubble-Tight Sealing​
   Equipped with resilient seats (EPDM, NBR, PTFE), the valve achieves bubble-tight shut-off in both directions, preventing leakage in closed positions . The seal design compensates for wear and minor misalignments, extending service life .
5. Versatile Material Compatibility​
   Available in corrosion-resistant materials​ like stainless steel 316 for aggressive media or coated cast iron for water services, the valves adapt to various fluids—water, chemicals, gases, and slurries . Material selections ensure compliance with hygienic standards (e.g., 3A) for food, pharmaceutical, or sanitary applications .
6. Easy Maintenance and Long Service Life​
   The simple design requires minimal upkeep, with replaceable seats and stems accessible without removing the valve body . Robust construction ensures over 100,000 cycles under standard conditions, with some models exceeding 50 years of service .

Typical Applications of Handle Butterfly Valve​

• Water and Wastewater Treatment: Used in pumping stations, distribution mains, and treatment plants​ for isolation and flow control, leveraging corrosion resistance and tight sealing for potable or wastewater .
• HVAC Systems: Regulate chilled or hot water flow​ in heating/cooling circuits, ensuring energy-efficient temperature control in commercial buildings .
• Fire Protection Systems: Grooved-type valves enable quick installation in sprinkler networks, providing reliable shut-off during emergencies .
• Chemical and Industrial Processing: Handle acids, alkalis, and solvents​ in pipelines, with material options like SS316 resisting corrosion .
• Food and Beverage Industry: Sanitary designs with polished surfaces and CIP compatibility​ meet hygiene standards for dairy, beverages, and pharmaceuticals .

Technical Specifications​

Table: Standard Handle Butterfly Valve Specifications

Number	Name	Material	Quantity
01	BODY	PVC,CPVC,FRPP,PP	1
02	SEAT SEAL	EPDM,FPM	1
03	DISC	PVC,CPVC,FRPP,PP	1
04	O-RING	EPDM,FPM	2
05	STEM Rod/Bar	STEEL,304,316	1
06	BEAR	ABS	1
07	PLATE	PVC	1
08	SCREW	STEEL	4
09	CAPScrew	PVC	4
10	HANDLE	ABS	1
11	SPRING	304	1
12	LEVER	ABS	1
13	SET PIN	304	1
14	BOLT	STEEL	1
15	LOGO	ABS	1
16	MARK Specification	ABS	1

Frequently Asked Questions (FAQs)​

Q1: How does a handle butterfly valve differ from a gear-operated or automated valve?​

Handle valves offer manual, quick operation​ suited for smaller sizes (up to DN300) and applications requiring frequent adjustments, while gear operators provide mechanical advantage for larger valves or high-torque needs . Automated actuators (pneumatic/electric) allow remote control but add cost and complexity .

Q2: Can handle butterfly valves be used for throttling flow?​

Yes, their linear flow characteristics​ enable moderate throttling by partially opening the disc (e.g., 30–70 degrees) . However, prolonged partial opening may cause cavitation or seat wear; for precise control, high-performance designs with characterized discs are recommended .

Q3: What maintenance is required for these valves?​

Routine checks include inspecting seals for wear, lubricating the stem, and verifying handle operation​ . Seats and stems may need replacement after extended use, but the design allows in-line servicing without pipe disassembly .

Q4: Are these valves suitable for abrasive slurries or high-pressure steam?​

Standard valves handle moderate abrasives​ but may suffer accelerated seal wear; hardened discs or metal seats are available for slurries . For high-pressure steam (>1.6 MPa), specialized high-performance valves with triple eccentricity and metal seals are required .

Q5: How do I select the right size and connection type?​

Match the valve’s DN/PN rating to pipeline specifications​ . Wafer types are cost-effective for between-flange installation; lug valves allow dead-end service; flanged ends suit high-integrity connections .