Flange Ball Valve
QFBV Series
The WALTER QFBV model Flange Ball Valve is an expertly engineered, full bore, quarter-turn valve designed for seamless on/off operations. With options for both manual and automatic actuation (electric or pneumatic), this versatile valve boasts a simple yet robust two-piece construction, ensuring effortless maintenance throughout its extended service life. Its reliability makes it the preferred choice for demanding industrial applications and essential utility services. The diverse range of seating options and body materials empowers it to meet the varied demands of numerous industrial applications.
Application Range
• Ideal for Pump Stations
• Essential for Water Supply Systems
• Integral in Water Treatment and Distribution Systems
• Perfect for Tanks
• Vital in Power Station Cooling Lines
Testing
▪ Body Strength Test: BS EN 12266-1: 1.5 x PN - Ensures robust durability.
▪ Seat Tightness Test: BS EN 12266-1: 1.1 x PN - Guarantees impeccable sealing integrity.
ISO 5208 Rate A - Confirms superior reliability.
▪ Pressure Testing: Adheres to BS EN ISO 5208 - Validates comprehensive pressure 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 |
Features
• Constructed with a two-piece ductile iron body; designed for full bore operation.
• Features floating seat technology, spherical seating, a floating ball, and adaptive sealing mechanisms. Additionally offers a fireproof design suitable for fire protection pipelines.
• The valve seat boasts a symmetrical design, ensuring non-directional switching, installation, sealing, and pressure management.
• Employs a wear-resistant bushing design for the valve stem, guaranteeing low torque and extended life. The innovative self-tightening upper seal design ensures no leakage of the valve stem even under high pressure scenarios.
• Upper flange adheres to the ISO5211 standard.
• The ball undergoes solution treatment or hard chrome plating for unmatched material stability and enhanced surface wear resistance, elevating sealing performance and prolonging product lifespan.
• The handle incorporates a positioning lock design, facilitating easy and secure 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. We are a distinguished professional manufacturer dedicated to crafting top-tier water system valves. Our extensive OEM capabilities include Sluice Valves, Gate Valves, Flange Butterfly Valves, Check Valves, Strainers, Pressure Reducing Valves, Fire Hydrants, and a broad spectrum of international valves conforming to various standards and specifications. Select products are FM/UL Certified. At Walter, we prioritize consumer experience by offering expert advice and cutting-edge fluid control solutions. Additionally, we embrace custom designs and special requirements to meet your unique needs.
We warmly invite your consultation and inquiries!
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