A Ductile Iron Silence Check Valve (also known as a Silent Check Valve or Non-Slam Check Valve) is a high-performance non-return valve engineered specifically to eliminate "water hammer" and noise in piping systems.
Unlike traditional swing check valves that rely on gravity or backflow to slam the disc shut, a silent check valve uses a spring-assisted mechanism to close the valve before the flow can reverse.
Design & Mechanism
The valve consists of a streamlined body, a center-guided disc, and a heavy-duty stainless steel spring.
Spring-Assisted Closing: As the pump starts to slow down, the spring pushes the disc toward the seat.
Early Closure: The valve is fully closed the moment the fluid velocity reaches zero, preventing the column of water from crashing back against a closed disc (which is what causes the "bang" or slam in other valves).
Technical Attributes
1,Design Standard,EN 16767 / MSS SP-125 / API 594
2,Size Range,"DN50 to DN600 (2"" to 24"")"
3,Body Type,Globe Style or Wafer Style
4,Pressure Class,PN10 / PN16 / PN25
5,Closing Mechanism,Spring-Loaded / Center Guided
6,Sealing Type,Metal-to-Metal or Resilient (EPDM/NBR)
7,Body Material,Ductile Iron (GGG40 / GGG50)
8,Disc Material,Stainless Steel (SS304/316) or Bronze
9,Spring Material,Stainless Steel AISI 304 / 316
10,Stem / Guide,Stainless Steel / Bronze
11,Bushing,Bronze (self-lubricating)
12,Face-to-Face,EN 558 Series 10 / Series 1
13,Coating,"Fusion Bonded Epoxy (FBE), Blue RAL 5005"
14,Coating Thickness,≥ 250 Microns
15,Flange Standard,EN 1092-2 / ASME B16.1
16,Tightness Class,EN 12266-1 Rate A (Soft seat) / Rate C (Metal)
17,Mounting Position,"Any Orientation (Vertical, Horizontal, Inclined)"
18,Flow Coefficient (Cv),Optimized streamlined body for low head loss
19,Shell Test Pressure,"1.5×PN (e.g., 24 Bar for PN16)"
20,Seat Test Pressure,"1.1×PN (e.g., 17.6 Bar for PN16)"
21,Working Temp.,−10°C to +80°C (Standard EPDM)
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
