304 Stainless Steel JIS 10K DN40 Water Supply Shock-Resistant Compact Silent Check Valve

Product Description

Brass Check Valve

A brass check valve is a compact, reliable flow control device designed to prevent reverse flow, consisting of a brass valve body, a movable closure element (disc or piston), a spring (for spring-loaded types), and precision-machined seating surfaces. Brass, its core material, offers excellent corrosion resistance, good thermal conductivity, and natural antimicrobial properties, making it ideal for water and low-corrosive media applications.
 

Its working principle is passive and automatic: no external controls are required. When fluid flows forward, the pressure pushes the closure element off the seat, compressing the spring (if equipped) and creating an unobstructed flow path. If flow reverses, the spring force and reverse pressure drive the element back onto the seat, forming a tight seal to block backflow instantly. This prevents equipment damage, media contamination, and pressure surges.
 

Key advantages include brass's durability against rust and wear, compact design for easy installation, and low maintenance due to fewer moving parts. It excels in residential, commercial, and light industrial scenarios-such as plumbing systems, water heaters, irrigation, and small-scale fluid transfer lines. Its combination of brass's material benefits and reliable reverse flow prevention makes it a cost-effective, long-lasting solution for low to medium-pressure applications.

DN	Size	L	H	quantity
15	1/2	55	3B	18
20	3/4	67	52
25	1	81	63
32	11/4	89	76
40	1/2	100	90
50	2	122	113
65	21/2	151	110	15
80	3	174	115
100	4	219	150	12

How a Silent Check Valve Works

A silent check valve achieves reverse flow prevention and noise elimination through a synergistic design of three core components: a streamlined valve body, a spring-loaded poppet (valve disc), and a precision-machined sealing seat. Its operational logic centers on linear motion, distinct from noisy swing-type alternatives.

During forward flow, fluid enters the valve inlet and exerts pressure on the poppet. This force overcomes the preload of the internal spring, pushing the poppet linearly upward to separate from the seat. The valve body's smooth, streamlined inner cavity ensures the poppet lifts without turbulence, creating an unobstructed flow path that minimizes pressure drop and avoids noise from chaotic fluid movement.

When flow reverses, the forward pressure dissipates instantly. The spring rebounds uniformly, driving the poppet to descend linearly and reseat tightly. Critical to its silence is the spring's damping effect: it absorbs the poppet's downward momentum, preventing the abrupt slamming against the seat that causes noise in traditional valves. The precision fit between the poppet and seat enhances sealing, blocking backflow completely while maintaining quiet operation.

This linear, spring-damped mechanism eliminates operational noise and reduces component wear, making it ideal for noise-sensitive environments like residences, hospitals, and commercial HVAC systems.