Flange Ball Valve
QFBV Series
The remarkable WALTER QFBV model Flange Ball Valve stands out as a full bore, quarter turn valve crafted for seamless on/off applications. Offering both manual and automated (electric or pneumatic) operation, its elegant two-piece design ensures simple maintenance while delivering a long and dependable service life. This makes it a preferred choice across various industrial applications as well as utility services. The extensive range of available seats and body materials enables it to meet the diverse demands of multiple industrial applications.
Application Range
• Pump Stations
• Water Supply Systems
• Water treatment and distribution systems
• Tanks
• Power Station Cooling Lines
Rigorous Testing
▪ Body Strength Test: BS EN 12266-1: 1.5 x PN-reliable and robust.
▪ Seat Tightness Test: BS EN 12266-1: 1.1 x PN-precision seating for assured performance.
ISO 5208 Rate A-stringent adherence to quality.
▪ Pressure Testing: Adhering to BS EN ISO 5208 standards-guaranteeing resilience.
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 |
Outstanding Features
• Engineered with a two-piece ductile iron body and full bore design for enhanced flow.
• Equipped with a floating seat, spherical seat, floating ball, and adaptive sealing. This valve also incorporates a fireproof design, making it suitable for fire protection pipes-fortified against extreme conditions.
• Symmetrical valve seat design ensures non-directional operation for switching, installation, sealing, and pressure.
• A wear-resistant bushing design on the valve stem ensures low torque and a prolonged lifespan. The innovative self-tightening upper seal design ensures zero leakage of the valve stem even under high pressure-reliable performance guaranteed.
• Compliant with ISO5211 standard-the upper flange meets international standards.
• The ball is treated with solution or hard chrome plating, guaranteeing reliable material stability and exceptional surface wear resistance. This enhances sealing performance and extends the product's life.
• The handle integrates a positioning lock design, simplifying installation-secure and efficient.
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)-precision-engineered to meet exact specifications.
| 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. We are a distinguished manufacturer specializing in water system valves. Our offerings include OEM services for Sluice Valves, Gate Valves, Flange Butterfly Valves, Check Valves, Strainers, Pressure Reducing Valves, Fire Hydrants, and various international standard valves. Many of our products proudly carry FM/UL certifications. At Walter, we prioritize customer satisfaction by providing expert advice and fluid control solutions. Furthermore, we welcome custom designs and special requirements to cater to unique customer needs.
We eagerly invite your inquiries and consultations!
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