Axial Silent Check Valve

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

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TECHNICAL DATA SHEET

Axial Silent Check Valve

Ductile Iron Body · Bronze Trim

PRODUCT DESCRIPTION

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.

디자인 특징

Feature	설명
밸브 유형	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

TECHNICAL SPECIFICATIONS

3.1 General Parameters

매개변수	사양
Size Range	DN50 – DN600 (2″ – 24″)
Pressure Ratings	PN10 / PN16 / Class 125 / Class 150 / Class 300
설계 표준	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

매개변수	사양
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)

MATERIAL SPECIFICATION

요소	재료	Grade / Standard
몸	Ductile Iron (DI)	ASTM A395 Gr. 60-40-18 / ASTM A536
디스크	Bronze / Aluminum Bronze	ASTM B148 / CA377
Trim	Bronze (Aluminum Bronze)	Unleaded bronze composition
좌석	Metal seat (Bronze) or Resilient (EPDM/NBR)	Metal-to-metal or soft-seal option
봄	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.

PERFORMANCE & TESTING

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 (Typical – Wafer Type)

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.

APPLICATIONS

Municipal water supply and distribution systems
Wastewater treatment plants
Pump discharge protection (prevents backflow and pump reversal)
HVAC and building services
Fire protection systems
Irrigation systems
Industrial process cooling water
Potable water systems (NSF/ANSI 61 & 372 approved with bronze trim)

OPTIONS & CUSTOMIZATIONS

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

APPLICABLE STANDARDS

기준	설명
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

보증:

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