Flange Ball Valve
QFBV Series
The WALTER QFBV model Flange Ball Valve is an exemplary full-bore, quarter-turn valve specifically crafted for on/off applications, suitable for both manual and automatic operations, whether electric or pneumatic. With its streamlined two-piece design, this valve promises effortless maintenance across its extended service life, making it the top choice for rigorous industrial applications as well as versatile utility services. The diverse options of seat and body materials ensure this valve adapts seamlessly to a wide range of industrial applications. and body materials allow it to respond to multiple applications in the industry.
Application Range
• Pump Stations
• Water Supply Systems
• Water treatment and distribution systems
• Tanks
• Power Station Cooling Lines
Testing
▪ Body Strength Test adheres to BS EN 12266-1: 1.5 x PN
▪ Seat Tightness Test complies with BS EN 12266-1: 1.1 x PN
ISO 5208 Rate A
▪ Pressure Testing meets BS EN ISO 5208 standards
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
• Constructed with a robust two-piece ductile iron body, featuring a full bore design for optimal flow.
• Equipped with a floating seat, spherical seat, floating ball, and adaptive sealing. Boasts a fireproof design, ideal for fire protection piping systems.
• The symmetrical design of the valve seat ensures non-directional functionality in switching, installation, sealing, and pressure.
• The valve stem incorporates a wear-resistant bushing design, guaranteeing low torque and extended operational life. The innovative self-tightening upper seal design ensures zero leakage of the valve stem under high-pressure conditions.
• The upper flange is designed in accordance with ISO5211 standard.
• The ball is either solution treated or hard chrome plated, offering reliable material stability and enhanced surface wear resistance, thereby boosting sealing performance and extending product lifespan.
• The handle features a positioning lock design, facilitating easy 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. As a leading manufacturer in the water system valves industry, Suzhou Walter Flow Control Equipment Co., Ltd. excels in the OEM production of various international valves including sluice valves, gate valves, flange butterfly valves, check valves, strainers, pressure reducing valves, fire hydrants, and more. Our commitment to quality is evidenced by certifications from FM/UL for select products. At Walter, we prioritize consumer satisfaction by offering expert advice and comprehensive fluid control solutions. We also accommodate custom designs and specific requirements, ensuring personalized service. We eagerly await your inquiries and look forward to collaborating with you.
Look forward to your consultation!
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