Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of lever operated butterfly valve in China. If you're going to buy wholesale customized lever operated butterfly valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
The wafer type hand lever operated butterfly valve is the conventional butterfly valve preferred for pipelines, featuring a simple structure, low flow resistance coefficient, nearly linear flow characteristics, and no tendency to trap debris. It is lightweight, easy to install, and has low driving torque. This series uses a centerline design. The main valve structure consists of body, disc, seat, stem, and drive mechanism. The seat features a removable design. Drive mechanisms include handle type and worm gear type. This lever operated wafer butterfly valve can be used for both shut-off and flow regulation. The soft-sealed butterfly valve is suitable for temperatures ≤80°C and nominal pressures ≤1.6 MPa in industries like water supply/drainage, sewage, and heating. It is particularly suitable for applications requiring bidirectional sealing and where valve body corrosion is a concern.
Technical Parameters
- Body Material: Ductile Iron
- Connection Size: DN50 - DN200
- Nominal Pressure: 1.0 MPa, 1.6 MPa
- Applicable Medium: Water
- Medium Temperature: 0~80°C
Product Features
Removable seat design facilitates field maintenance. Full-bore design minimizes obstruction by impurities. Integrated "O"-ring type seals at both ends provide reliable pipeline sealing without additional gaskets. Different seat materials can be selected based on requirements.
The pin uses a taper pin structure, firmly combining the disc and stem to prevent loosening, maintaining stem strength, and ensuring good interchangeability.
Flexible operator selection; can be configured with handle, worm gear, etc., per customer requirements.
Replaceable seals with reliable bidirectional sealing. Installation is not limited by flow direction; can be installed in any orientation.
Uses rubber EPDM as the sealing ring. Large contact area between disc and seat ensures reliable sealing. Zero gas leakage in fully sealed state.
Compact, lightweight, easy to disassemble, maintain, and install in any position.
Simple, compact structure, low operating torque, rapid 90° rotation opening.
Nearly linear flow characteristics, good regulating performance.
Disc-to-stem connection uses a pinless structure, eliminating a potential internal leakage point.
Disc outer circumference uses a spherical design, improving sealing and extending service life. Maintains zero leakage after over 50,000 pressure cycles.
Product Application
Suitable for various pipelines in HVAC, water supply/drainage, construction, municipal water supply systems for connection and flow regulation.
Installation Instructions
The wafer type hand lever operated butterfly valve is a common type in industrial pipelines. Its structure is compact. Simply place the valve between two pipeline flanges and secure it with through-bolts to control the fluid. It is particularly suitable for spaces with limited room or short distances between pipes. When fully open, the disc thickness presents minimal resistance to flow, resulting in low pressure drop and good flow control characteristics.
Pre-Installation Notes
Before installation, blow clean the piping with air to remove foreign matter; rinse the pipe interior with clean water.
Carefully verify the lever butterfly valve's suitability against its performance specifications (temperature, pressure).
Check the valve passage and sealing surfaces for debris and clean promptly.
Install the lever operated wafer butterfly valve promptly after unpacking. Do not arbitrarily loosen any fastening screws or nuts on the valve.
Dedicated butterfly valve flange plates must be used.
During flange installation, ensure the flange face and seal gasket are aligned, screws are tightened evenly, and the sealing surface makes complete contact. Uneven screw tightening can cause the gasket to bulge and obstruct the disc or cause leakage at the stem.
Maintenance & Troubleshooting
Regular Inspection
Surface Cleaning
Clean dust and oil from the lever butterfly valve surface to prevent corrosion.
Seal Inspection
Repair worn/scratched sealing surfaces; replace damaged seals.
Operator Inspection
Ensure the handle, stem, etc., operate flexibly and reliably without sticking.
Common Faults & Remedies
|
Common Fault |
Causes |
Solutions |
|
Leakage when closed |
1. Debris inside the pipeline. 2. Incorrect pipe flange selected or misalignment during installation. |
1. Remove debris. 2. Use correct butterfly valve flanges. |
|
Failure to open |
1. Damage to the connecting key between the drive device and valve stem. 2. Breakage or detachment of the taper pin connecting the valve stem and disc. |
1. Replace the connecting key. 2. Replace the connecting taper pin. |
FAQ
Q: What does "wafer type" installation mean?
A: The valve has no flanges of its own. The wafer type hand lever operated butterfly valve is installed by being clamped between two pipeline flanges using long through-bolts, saving space and weight.
Q: Why is a removable seat beneficial of lever operated wafer butterfly valve?
A: It allows for easier replacement of the sealing seat during maintenance without removing the entire valve body from the pipeline.
Q: Can this lever butterfly valve handle bidirectional flow?
A: Yes, its design provides bidirectional sealing, meaning it can seal effectively regardless of the direction of flow.
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