Flange Ball Valve
QFBV Series
The renowned WALTER QFBV model Flange Ball Valve is engineered as a full bore, quarter turn valve ideal for efficient on/off applications. Whether manual or automated with electric or pneumatic systems, this valve is designed with a robust two-piece construction. Its simplicity ensures effortless maintenance, granting an extended working lifespan, making it a top choice for both industrial applications and utility services. Furthermore, the extensive range of seating options and diverse body materials make it versatile to suit a multitude of industrial applications.
Application Range
• Pump Stations
• Water Supply Systems
• Water Treatment and Distribution Systems
• Storage Tanks
• Cooling Lines in Power Stations
Testing
▪ Body Strength Test: Conforms to BS EN 12266-1: Tested at 1.5 times the PN rating.
▪ Seat Tightness Test: In line with BS EN 12266-1: Evaluated at 1.1 times the PN rating.
ISO 5208 Rate A
▪ Comprehensive Pressure Testing: Adheres to 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 two-piece ductile iron body and a full bore design for optimal flow.
• Innovative floating seat and spherical seat coupled with floating ball adapt seamlessly with adaptive sealing. Designed for fireproof applications, allowing use in fire protection pipelines.
• The valve seat embraces a symmetrical design, ensuring non-directional switching, installation, sealing, and pressure management.
• Enhanced with a wear-resistant bushing on the valve stem, it guarantees low torque operation and longevity. The self-tightening upper seal design prevents leakage of the valve stem under high pressure, ensuring safety and reliability.
• Upper flange strictly adheres to the ISO5211 standard, providing universal compatibility.
• The ball undergoes either solution treatment or is hard chrome plated, enhancing material stability and surface wear resistance, thereby boosting sealing efficiency and extending product lifespan.
• The handle features a smart positioning lock design, ensuring straightforward installation and secure operation.
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
At Suzhou Walter Flow Control Equipment Co., Ltd. we pride ourselves as a specialized manufacturer of premium water system valves. Our offerings include OEM solutions for various valves such as sluice valves, gate valves, flange butterfly valves, check valves, strainers, pressure reducing valves, and fire hydrants, all meeting international standards and specifications. With options for FM/UL certification on select products, Walter is dedicated to exceptional user experience by providing insightful advice and innovative fluid control solutions. We are also open to custom designs and special requirements, always
eager to engage with you and look forward to your consultation!
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