Size Range:DN50-DN400
Connection Options:Female Thread
Working Pressure:1.6MPa-25Mpa
Working Temperature:-29°C to 425°C
Sealing Options:PTFE, VITON, PEEK, Graphite
Manufacturing Method:Forging
Applicable Medium:Oil, Gas, Water
Manufacturing Standard:ANSI, ASME, GB, JIS, DIN, customize as per customers’ drawing
A slow close check valve is designed to prevent backflow and minimize water hammer by gradually closing after forward flow stops. It is ideal for drainage, water supply, and pump systems where controlled shut-off is critical. Featuring a streamlined flow path, wear-resistant rubber disc, and optional damping mechanism, it ensures quiet, stable operation, long service life, and minimal maintenance. Suitable for clear or slightly corrosive media.
A micro-resistance and slow-close check valve can be installed at the outlet of pumps in drainage pipelines. It is designed to prevent backflow and eliminate destructive water hammer, effectively reducing closing pressure and protecting pipeline systems. Key benefits include lightweight disc, energy-saving operation, low flow resistance, anti-water hammer design, reliable sealing, wear resistance, long service life, stable operation, no vibration, and silent function.
| Part Name | Material |
|---|---|
| Body, Butterfly Plate | Gray Iron, Cast Steel |
| Disc | Rubber Assembly |
| Shaft | Stainless Steel |
| Model | Nominal Diameter DN (mm) | Nominal Pressure PN (MPa) | Shell Test Pressure (MPa) | Seal Test Pressure (MPa) | Max Working Pressure (MPa) | Working Temperature | Applicable Medium |
|---|---|---|---|---|---|---|---|
| HH44X-1.0 | 50–800 | 1.0 | 1.5 | 1.1 | 1.0 | ≤80℃ (≤100℃ upon request) | Water, weak corrosive media |
| KHH44 | 50–800 | 1.6 | 2.4 | 1.76 | 1.6 | ||
| HH44ZX | 50–800 | 2.5 | 3.75 | 2.75 | 2.5 |
Slow close check valves are primarily used in water supply and drainage systems to prevent backflow and minimize water hammer pressure surges during pump shutdowns. These valves are ideal for applications involving high flow rates and frequent start-stop operations, offering smooth, gradual closure to protect pipeline systems and equipment.
Typical applications include:
Municipal water supply networks
Irrigation systems
Pumping stations
HVAC systems
Industrial process pipelines
Sewage and wastewater treatment plants
The slow closing mechanism ensures quiet operation, prolongs valve service life, and helps maintain system stability by reducing pressure fluctuations and mechanical stress on pipes and pumps.
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