Tiansu (Tianjin) Valve Group Co., Ltd. is one of the leading manufacturers and suppliers of stainless steel butterfly valve in China. If you're going to buy wholesale customized stainless steel butterfly valve made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.
A stainless steel wafer butterfly valve is made from stainless steel, uses wafer connection, and is hand-operated via a handle. It is widely used in fluid systems due to its compact design, easy operation, and corrosion resistance. For example, a 2 inch stainless steel butterfly valve is commonly selected for smaller pipeline applications.
Technical Parameters
- Nominal Diameter: DN50 - DN200
- Nominal Pressure: PN10, PN16
- Operating Temp.: 0 ~ 80°C
- Applicable Medium: Water
Product Structure
Wafer Connection
The body of stainless butterfly valve is clamped directly between pipeline flanges, requiring no additional supports, reducing installation space by ~40% compared to flanged valves. Ideal for tight spaces.
Disc Rotation Control
The disc rotates 0-90° around its axis. At 90°, it's fully open. Flow resistance depends only on disc thickness, resulting in low pressure drop and near-linear flow characteristics, offering better regulation than gate valves.
Lightweight Design
Consists of few parts (body, disc, stem, seals), weighing about half of an equivalent gate valve, easing installation and maintenance.
Bidirectional Sealing
Installation is not flow-direction dependent; can be installed in any orientation.
Product Application
The stainless steel wafer butterfly valve is suitable for HVAC, building water supply/drainage, fire protection, and other low-pressure, ambient temperature systems requiring quick manual operation. Compatible with water, weakly corrosive media. The 2 inch stainless steel butterfly valve is particularly suitable for branch lines and meter installations.
Maintenance & Installation Notes
I. Installation & Usage Notes
Pre-Installation
Clean pipeline interior of weld slag, rust, etc. Verify the specs (size, pressure) of the stainless butterfly valve and match conditions. Inspect body and seals for cracks/scratches.
Installation Requirements
1. Use dedicated wafer flanges. Ensure bolt holes align. Flange flatness deviation ≤0.2mm. Valve axis alignment with pipeline ≤1°.
2. Tighten bolts crosswise and symmetrically in three stages to specified torque to avoid body deformation affecting seal.
3. Keep disc slightly open (5°-10°) during installation to prevent stem thermal expansion seizure. Avoid inverted installation; stem should ideally face up.
Operation
Apply even force when turning handle; avoid forcing beyond travel. Regularly exercise long-term closed valves to prevent disc-seat adhesion.
II. Maintenance Points
Regular Cleaning
Clean exterior dust/oil. For dirty media, periodically disassemble and clean internals to prevent debris buildup.
Lubrication
Apply grease to moving parts (stem, bearings) every 3-6 months for smooth operation.
Seal Inspection
Regularly check seal faces and rings for leaks; adjust or replace as needed.
Corrosion Protection
Inspect stainless steel surface for corrosion/coating damage. Perform pickling/passivation or touch-up painting on damaged areas.
Common Faults & Solutions
|
Common Fault |
Causes |
Solutions |
|
Valve Won't Operate |
1. Disc obstructed by debris. 2. Stem corroded/stuck. 3. Pipe stress deforming body. |
1. Disassemble and clean. 2. Polish corroded stem, lubricate; replace if severe. 3. Adjust pipe supports to relieve stress. |
|
Poor Shut-off / Internal Leak |
1. Seal face worn/scratched. 2. Seal ring aged/damaged. 3. Disc misaligned. |
1. Lap seal face; polish minor scratches; replace seat/disc if severe. 2. Replace with suitable seal ring. 3. Adjust disc-stem connection; recalibrate limits. |
|
External Leak (flange/stem) |
1. Uneven flange bolt tightening. 2. Packing aged/ gland loose. 3. Body has pinhole/crack. |
1. Tighten bolts evenly in diagonal pattern. 2. Replace packing and tighten gland. 3. Weld pinholes; replace body if cracked. |
|
Handle Operation Stiff |
1. Insufficient lubrication. 2. Bearing wear. 3. Disc adhesion to seat. |
1. Add lubricant. 2. Replace worn bearing. 3. Cycle valve manually, clean adhering debris. |
FAQ
Q: What is the primary advantage of stainless steel wafer butterfly valve?
A: Stainless steel provides excellent corrosion resistance, making these valves suitable for water, mild chemicals, and applications requiring cleanliness or where rust is a concern.
Q: Is this stainless butterfly valve suitable for throttling service?
A: Yes, its near-linear flow characteristics and 90-degree operation allow for reasonable flow regulation, though it is primarily an on/off valve.
Q: Why should the disc be slightly open during installation?
A: This prevents the stem from being put under stress if the pipeline expands due to welding heat or other causes, which could lead to binding or damage. This practice is especially recommended for precise installations such as with a 2 inch stainless steel butterfly valve.
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