Flange Ball Valve
QFBV Series
Introducing the WALTER QFBV model Flange Ball Valve, a pinnacle of engineering excellence designed for seamless on/off applications. This full bore, quarter-turn marvel can operate manually or automatically (electric or pneumatic), offering versatility and ease. Boasting a smart two-piece construction, it promises effortless maintenance over an extended lifespan, making it the preferred choice for both industrial implementations and utility services. Its diverse seat options and robust body materials empower it to meet the demands of various industrial applications with ease.
Application Range
• Pump Stations
• Water Supply Systems
• Water Treatment and Distribution Systems
• Tanks
• Power Station Cooling Lines
Testing
▪ Body Strength Test: BS EN 12266-1, rigorously tested at 1.5 times the nominal pressure (PN)
▪ Seat Tightness Test: BS EN 12266-1, proven at 1.1 times the nominal pressure (PN)
ISO 5208 Rate A
▪ Pressure Testing: conducted under the stringent standards of BS EN ISO 5208
Technical Data
| Size range |
DN32-DN250 |
| Pressure range |
PN10-16-25 |
| Temperature |
EPDM -10ºC to +80ºC / NBR -10ºC to +60ºC |
| Design |
DIN 3357 |
| Face to face |
DIN 3202 F4/F5 |
| Flange drilling |
EN 1092-2 / ISO 7005-2 |
| Coating |
Thermoplastic Powder Epoxy |
| Testing |
EN 12266-1 |
| Marking |
EN 19 |
| Coating Blue Color |
RAL 5005 |
| RAL 5010 |
| RAL 5015 |
| Custom made |
Features
• Engineered with a two-piece ductile iron body and designed for full bore flow.
• Incorporates a floating seat, spherical seat, and floating ball with adaptive sealing, alongside a fireproof design, suitable for fire protection systems.
• Symmetrical valve seat design ensures non-directional operation for switching, installation, sealing, and pressure control.
• Wear-resistant bushing on the valve stem enhances durability and reduces torque for long-lasting performance. Its self-tightening upper seal design guarantees a leak-proof experience under high pressure.
• Upper flange conforms to the ISO5211 standard, ensuring compatibility.
• The ball is either solution treated or hard chrome plated, offering superior material stability, surface wear resistance, and enhanced sealing reliability, thus extending the product's lifespan.
• Equipped with a handle featuring a positioning lock design for straightforward installation.
Material Specification
| No. |
Part Name |
Material |
Standard |
| 1 |
Body |
Ductile Iron |
EN GJS 500-7 |
| 2 |
Bonnet |
Ductile Iron |
EN GJS 500-7 |
| 3. |
Ball |
Stainless Steel |
SS 304 |
| 4 |
Stem |
Stainless Steel |
SS 304 |
| 5 |
Packing |
Rubber |
PTFE |
| 6 |
Hand lever |
Ductile Iron |
EN GJS 500-7 |
Dimension PN10/16(mm)
| INCH |
DN |
L |
D |
D1 |
b |
n-φd |
| PN10 |
PN16 |
| 1-1/4" |
32 |
130 |
140 |
100 |
19 |
4-φ19 |
| 1.5" |
40 |
140 |
150 |
110 |
19 |
4-φ19 |
| 2" |
50 |
150 |
165 |
125 |
19 |
4-φ19 |
| 2.5" |
65 |
170 |
185 |
145 |
19 |
4-φ19 |
| 3" |
80 |
180 |
200 |
160 |
19 |
8-φ19 |
| 4" |
100 |
190 |
220 |
180 |
19 |
8-φ19 |
| 5" |
125 |
325 |
250 |
210 |
19 |
8-φ19 |
| 6" |
150 |
350 |
285 |
240 |
19 |
8-φ23 |
| 8" |
200 |
400 |
340 |
295 |
22 |
8-φ23 |
12-φ23 |
| 10" |
250 |
450 |
405 |
355 |
24 |
12-φ23 |
12-φ27 |
ABOUT US
Suzhou Walter Flow Control Equipment Co., Ltd. is a revered expert in crafting superior water system valves. We offer OEM solutions for an array of valve types, including Sluice Valves, Gate Valves, Flange Butterfly Valves, Check Valves, Strainers, Pressure Reducing Valves, and Fire Hydrants, all adhering to international standards and specifications. Select products are available with FM/UL Certification. At Walter, we prioritize customer satisfaction by providing expert advice and tailored fluid control solutions. Embracing custom designs and special requests is our forte.
We eagerly await your consultation!
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