Flange Ball Valve
QFBV Series
The illustrious WALTER QFBV model Flange Ball Valve is a masterfully crafted full bore quarter turn valve, ideal for on/off applications. Whether operated manually or automatically (by electric or pneumatic means), this valve boasts a simple yet robust 2-piece construction designed for effortless maintenance and unparalleled longevity. This makes it the preferred choice for both industrial applications and utility services. The versatile range of seat options and diverse body materials empowers it to cater to a myriad of industrial applications.
Application Range
• Pump Stations
• Water Supply Systems
• Water treatment and distribution systems
• Tanks
• Power Station Cooling Lines
Testing
▪ Body Strength Test: In accordance with BS EN 12266-1: 1.5 x PN
▪ Seat Tightness Test: Compliant with BS EN 12266-1: 1.1 x PN
ISO 5208 Rate A
▪ Pressure Testing: Conducted as per 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
• Constructed with a robust two-piece ductile iron body; designed for full bore passage.
• Equipped with a floating seat, spherical seat, and floating ball, featuring an adaptive sealing mechanism. Additionally, it boasts a fireproof design, making it suitable for fire protection systems.
• The valve seat features a symmetrical design, ensuring non-directional switching, installation, sealing, and pressure.
• The valve stem incorporates a wear-resistant bushing design, guaranteeing low torque and extended lifespan. The self-tightening upper seal design ensures no leakage from the valve stem even under high pressure conditions.
• The upper flange adheres to the ISO5211 standard.
• The ball undergoes solution treatment or is hard chrome plated, ensuring material reliability and surface wear resistance, thereby enhancing sealing performance and extending product lifespan.
• The handle features 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. As a distinguished manufacturer of water system valves, Suzhou Walter Flow Control Equipment Co., Ltd. excels in producing OEM solutions for Sluice Valves, Gate Valves, Flange Butterfly Valves, Check Valves, Strainers, Pressure Reducing Valves, Fire Hydrants, and a host of other international standard valves. Several products proudly bear FM/UL Certification. Walter is committed to enhancing consumer experiences by offering expert advice and fluid control solutions, along with accommodating custom designs and unique specifications.
We eagerly anticipate your inquiries and look forward to serving you!
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