TECHNICAL DATA SHEET
Axial Silent Check Valve
Ductile Iron Body · Bronze Trim
The Axial Silent Check Valve (also referred to as axial flow non-slam check valve) is a spring-assisted, automatic non-return valve designed to prevent reverse flow and protect pumping equipment from damaging water hammer and pressure transients. Featuring a streamlined venturi-pattern flow path with an integral flow guide, this valve provides minimal pressure drop, silent operation, and rapid spring-assisted closure.
Constructed with a ductile iron body and bronze trim, this valve offers an optimal balance of corrosion resistance, strength, and cost-effectiveness for municipal water, HVAC, irrigation, and industrial pumping applications. The spring-loaded disc closes at near-zero flow velocity, ensuring positive shut-off before flow reversal occurs, thereby eliminating slamming and surge.
Feature | Description |
Valve Type | Axial flow, spring-assisted silent check valve (non-slam) |
Body Design | One-piece ductile iron body eliminates leak paths for superior performance |
Flow Path | Streamlined venturi/axial design with integral straightening vanes for laminar flow and minimal head loss |
Disc Mechanism | Center-guided, spring-loaded poppet-type disc with short stroke for rapid closure |
Closure | Spring-assisted closure at approximately ½ psi positive head on inlet port, preventing water hammer |
Trim Material | Bronze (aluminum bronze) – provides excellent corrosion resistance and wear properties |
Mounting Orientation | Suitable for horizontal or vertical installation (vertical with upward flow) |
Maintenance | Low maintenance design with durable internal components |
3.1 General Parameters
Parameter | Specification |
Size Range | DN50 – DN600 (2″ – 24″) |
Pressure Ratings | PN10 / PN16 / Class 125 / Class 150 / Class 300 |
Design Standards | API 594, ASME B16.34, ISO 5752 |
Face-to-Face Dimensions | ASME B16.10, EN 558, API 609, BS 5155, DIN 3202 |
Flange Accommodation | ASME B16.42, DIN PN10/PN16, BS 4504, ISO 7005 |
End Connections | Wafer type, flanged (RF, FF), plain face |
3.2 Operating Conditions
Parameter | Specification |
Maximum Working Pressure | 2.5 MPa (25 bar) / Class 300 |
Maximum Pressure (Ductile Iron) | 640 PSI @ 100°F (Class 300 WOG, non-shock) |
Operating Temperature (Valve) | -34°C to +121°C (-30°F to 250°F) |
Maximum Temperature (Bronze Trim) | 316°C (600°F) |
Allowable Continuous Use Temp. | 0°C to +80°C (standard service) |
Component | Material | Grade / Standard |
Body | Ductile Iron (DI) | ASTM A395 Gr. 60-40-18 / ASTM A536 |
Disc | Bronze / Aluminum Bronze | ASTM B148 / CA377 |
Trim | Bronze (Aluminum Bronze) | Unleaded bronze composition |
Seat | Metal seat (Bronze) or Resilient (EPDM/NBR) | Metal-to-metal or soft-seal option |
Spring | Stainless Steel (316 SS) | ASTM A313 Gr. CF8M |
Guide / Bushing | Bronze / Stainless Steel | — |
O-Ring / Seals | Buna-N (NBR) / EPDM / Viton® | Various elastomer options |
Note: Bronze trim provides excellent corrosion resistance, low friction operation, and is NSF/ANSI 61 and 372 approved for potable water applications.
Test | Requirement |
Body Shell Test | 1.5 × rated pressure (hydraulic) |
Seat Leak Test | 1.1 × rated pressure |
Allowable Seat Leakage | Meets or exceeds API 598 leakage requirements |
Closure Characteristic | Silent, non-slam closure at near-zero flow velocity |
Water Hammer Prevention | Spring-assisted disc closes before flow reversal occurs |
Bubble-tight Seal | Available with resilient seat option |
Dimensions are for reference. Consult factory for specific drawings.
DN | Face-to-Face (mm) | Approx. Weight (kg) |
50 | 120 | — |
65 | 150 | — |
80 | 180 | — |
100 | 229 | — |
125 | 254 | — |
150 | 267 | — |
200 | 292 | — |
250 | 330 | — |
300 | 356 | — |
Face-to-face dimensions per GB/T 12221 / EN 558.
Option | Details |
Seat Materials | Metal seat (standard), EPDM, Buna-N (NBR), Viton® (FKM), RPTFE |
Body Materials | Ductile iron (standard), Carbon steel, Stainless Steel 316 |
Disc Materials | Bronze, Stainless Steel 316, Ductile Iron with coating |
Spring Materials | Stainless Steel 302, 316 |
End Connections | Wafer, lug, flanged (RF, FF) |
Pressure Classes | Class 125, 150, 300 |
Coating | Epoxy coating internal/external for enhanced corrosion resistance |
Standard | Description |
API 594 | Check valves: wafer, lug, and double-flanged types |
ASME B16.34 | Valves — Flanged, threaded, and welding end |
ASME B16.10 | Face-to-face dimensions |
ASME B16.42 | Ductile iron pipe flanges and flanged fittings |
ISO 5752 | Face-to-face dimensions for valves |
API 598 | Valve inspection and testing |
MSS SP72 | Ball valves with flanged or butt-welding ends for general service |
NSF/ANSI 61 & 372 | Drinking water system components – health effects & lead content |
GUATANTEE:
SAVVY VALVES is committed to delivering exceptional product quality and worry-free after-sales service. Our valves are guaranteed to provide a minimum service life of 12 months, during which we will supply all necessary spare parts and detailed maintenance instructions free of charge. Within the warranty period, if any non-human-induced damage occurs, we will replace components at no cost and provide professional technical support. After the warranty expires, customers only need to pay for the cost of spare parts, while still benefiting from discounted maintenance services. Our goal is to help clients reduce operational costs and enhance production efficiency through reliable quality and comprehensive after-sales support. Whether for technical inquiries or maintenance needs, our expert team will respond promptly to ensure your valve system maintains optimal performance at all times.
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