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Our suction diffuser is designed to ensure smooth pump operation by providing uniform flow distribution and protecting pumps from debris with its built-in strainer screen.
Widely used in HVAC, chilled water, cooling towers, and industrial pumping systems, it reduces installation space and eliminates the need for an elbow, strainer, and reducer separately.
Manufactured with robust cast iron or ductile iron body and available in multiple sizes, our suction diffusers guarantee easy maintenance, reliable performance, and extended pump life. Ideal for contractors, distributors, and end users seeking cost-effective and durable solutions.
NO |
Name |
Material |
|
| Chinese Spec | ASTM Spec | ||
| 1 | Body | HT250 QT450- 10 |
ASTM 126-ClassB A536 65-45- 12 |
| 2 | Cover | HT250 QT450- 10 |
ASTM 126-ClassB A536 65-45- 12 |
| 3 | Screen | 0Cr18Ni9 | ASTM A276 304 |
| 4 | O-ring | EPDM | EPDN |
| NPS | 2x2 | 2½x2 | 2½x2½ | 3x2 | 3x2½ | 3x3 | 4x3 | 4x4 | 5x4 | 5x5 | 6x4 | 6x5 | 6x6 | 8x5 | 8x6 |
| DN | 50x50 | 65x50 | 65x65 | 80x50 | 80x65 | 80x80 | 100x80 | 100x100 | 125x100 | 125x125 | 150x100 | 150x125 | 150x150 | 200x125 | 200x150 |
| L1 | 114.3 | 127 | 127 | 139.7 | 140.1 | 140.1 | 165 | 165 | 191.5 | 191.5 | 203 | 203 | 203 | 192 | 228.6 |
| L2 | 114.3 | 127 | 127 | 114 | 140.1 | 140.1 | 165 | 165 | 191.5 | 191.5 | 165 | 203 | 203 | 228.6 | 203.2 |
| H | 125 | 138 | 138 | 125 | 143 | 143 | 172 | 166 | 223 | 223 | 172 | 250 | 250 | 312 | 250 |
| NPT | ¾NPT | 1NPT | |||||||||||||
| Kv | 64.5 | 64.5 | 109 | 64.5 | 109 | 143 | 143 | 252 | 252 | 498 | 252 | 498 | 585 | 498 | 585 |
| Cv | 75.2 | 75.2 | 127.2 | 75.2 | 127.2 | 166.9 | 166.9 | 294.1 | 294.1 | 581.2 | 294.1 | 581.2 | 682.7 | 581.2 | 682.7 |
| Weight (Kg) | 11 | 15 | 17 | 19 | 21 | 23 | 33 | 36 | 48 | 50 | 42 | 52 | 54 | 60 | 83 |
| NPS | 8x8 | 10x8 | 10x10 | 12x8 | 12x10 | 12x12 | 14x10 | 14x12 | 14x14 | 16x12 | 16x14 | 16x16 |
| DN | 200x200 | 250x200 | 250x250 | 300x200 | 300x250 | 300x300 | 350x250 | 350x300 | 350x350 | 400x300 | 400x350 | 400x400 |
| L1 | 228.6 | 279.4 | 279.4 | 280 | 304.8 | 304.8 | 318 | 318 | 318 | 334 | 334 | 334 |
| L2 | 228.6 | 228.6 | 279.4 | 280 | 279.4 | 304.8 | 328 | 328 | 328 | 364 | 364 | 364 |
| H | 355 | 355 | 458 | 315 | 458 | 454 | 460 | 460 | 460 | 522 | 522 | 522 |
| NPT | 1¼NPT | |||||||||||
| Kv | 910 | 910 | 1480 | 910 | 1480 | 2150 | 1480 | 2150 | 252 | 498 | 252 | 498 |
| Cv | 1062 | 1062 | 1727.2 | 1062 | 1727.2 | 2509.1 | 1727.2 | 2509.1 | 294.1 | 581.2 | 294.1 | 581.2 |
| Weight (Kg) | 110 | 124 | 141 | 148 | 202 | 215 | 226 | 243 | 48 | 50 | 42 | 52 |
1, Commonly used at the pump suction side ,not only to filter the impurities, but also replace the elbow Strainer and straight pipe ahead of the pump suction side , can reduce the cost.
2, Because the suction side and discharge side could have different diameter, it can replace the different diameter elbow.
3, Large open area, large drain outlet, can drainage and flushing easily, so as to reduce the maintenance.
4,Discharge outlet has unique straight guide vane, can reduce the damage of the vortex flow to the pump and the system.
Shanghai Flow Valve &Fitting Co, Ltd. was founded in 1998, mainly in foreign trade export business, has invested in two professional manufacturing factories in Shanghai Jiading Waigang Industrial Zoneand Tianjin Wuqing Jingbin Industrial Park.
These two subordinate factories are responsible for the professional production of ANSl, DINBS, GB and other standards of ball valve, butterfly valve, gate valve, stop valve, balance valve, filter, plug valve, control valve and other series of products.
Nearly 80% of the company's products are exported to Europe,America, the Middle East, Southeast Asia and other parts of the world and we also conduct technical cooperation and OEM production with many European and American companies.
Shanghai Flow Valve & Fitting Co., Ltd. began to actively participate in major domestic engineering projects in 2003.
lt has established five sales centers in Shanghai, Beijing, Guangzhou, Xi'an and Chongqing, and its business covers northeast China, North China, northwest China,Southwest China, Central China, South China and other regions.
The sales network and after-sales network basically cover most regions of mainland China.
Q1: What is a suction diffuser?
A1: A suction diffuser is a pump inlet device that ensures smooth, uniform flow into the pump, reducing turbulence and protecting the pump from damage.
Q2: Why should I use a suction diffuser?
A2: It helps prevent cavitation, reduces vibration, and extends pump life by providing stable, uniform flow.
Q3: Which pumps can use suction diffusers?
A3: Suitable for centrifugal pumps, vertical turbine pumps, and other industrial pumps requiring stable inlet conditions.
Q4: What materials are used for suction diffusers?
A4: High-quality stainless steel, cast iron, or other corrosion-resistant materials are used to ensure durability and long service life.
Q5: How do I install a suction diffuser?
A5: Follow the flow direction marked on the diffuser; ensure proper alignment and connection to the pump suction flange.
Q6: Can suction diffusers be customized?
A6: Yes, we offer custom sizes, materials, and configurations to meet your specific pump and system requirements.
Q7: How does a suction diffuser improve pump efficiency?
A7: By providing uniform flow and reducing turbulence, it minimizes energy loss and enhances overall pump performance.
Q8: How do I maintain a suction diffuser?
A8: Regular inspection for debris, corrosion, and proper alignment ensures optimal operation and prevents pump damage.
Q9: Is it suitable for high-flow or high-pressure systems?
A9: Yes, our heavy-duty suction diffusers are designed for demanding industrial applications with high flow and pressure conditions.
Q10: Can suction diffusers help reduce maintenance costs?
A10: Yes, by protecting the pump and preventing cavitation, it reduces repairs and downtime, saving maintenance costs.
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