Silent Check Valve

Your Professional silent-check-valve Supplier

TIANJIN XTD VALVE CO., LTD. is a professional manufacturer of various valves, including butterfly valves, gate valves, filters, ball valves, globe valves, and more.

Unlike ordinary valve manufacturers, XTD VALVE owns its own rubber factory and valve stem processing facility, allowing for greater control over quality and production efficiency.

Ductile Iron Silencing Check Valve
The ductile iron silent check valve serves as a critical barrier against backflow in pipeline networks, ensuring unidirectional flow to safeguard pumps and equipment. Its technical superiority stems

Why choose us

Our Certificates
Our products have passed ISO 9001 certification. We have also been recognized as a high-tech enterprise, received an AAA credit rating certificate, and hold multiple patents.

Production & Market
Since its establishment, TIANJIN XTD VALVE CO., LTD. has gained strong domestic sales due to its excellent quality and solid reputation.While maintaining a firm foothold in the domestic market, the company actively explores international markets by participating in global exhibitions, showcasing product advantages, and establishing relationships with customers worldwide. Our products are exported to multiple countries and regions, including Indonesia and other international destinations.

Our Services
From CAD drawings to delivery – We provide seamless service:
● 1-on-1 Engineering Support with over 30 years of expertise
● 15-Day Fast Delivery for standard valves
● Custom Solutions at no additional cost

Silent-check-valve

Silent check valve is a specially designed check valve used primarily to prevent the reverse flow of liquid or gas in a pipeline. Its main function is to prevent the medium from flowing back and ensure that the fluid can only flow in one direction, thereby protecting the pipeline system from the effects of backflow. At the same time, the silent check valve design reduces water hammer and noise when closed, providing a quieter operating environment.

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Model number	Nominal pressure	Shell test pressure	Seal test pressure	Application medium	Working temperature
H41X-10	1.0MPa	1.5MPa	1.1MPa	Water and weak corrosive fluid	0-80℃
H41X-16	1.6MPa	2.4MPa	1.76MPa	Water and weak corrosive fluid	0-80℃

Model number	Body	Sealing ring	Spring
H41X-10	Cast iron or stainless steel	Butyl rubber (NBR)	1Cr18Ni9Ti stainless steel wire
H41X-16	Cast iron or stainless steel	Butyl rubber (NBR)	1Cr18Ni9Ti stainless steel wire

Nominal pressure	Nominal diameter	Size (mm)					Nominal pressure	Nominal diameter	Size (mm)
Nominal pressure	Nominal diameter	L	D	K	B	Z-Ød	Nominal pressure	Nominal diameter	L	D	K	B	Z-Ød
1.0	40	110	145	110	18	4-18	1.6	40	110	145	110	18	4-18
	50	110	160	125	20	4-18		50	110	160	125	20	4-18
	65	120	180	145	20	4-18		65	120	180	145	20	4-18
	80	130	195	160	22	8-18		80	130	195	160	22	8-18
	100	150	215	180	24	8-18		100	150	215	180	24	8-18
	125	180	245	210	26	8-18		125	180	245	210	26	8-18
	150	180	280	240	26	8-22		150	180	280	240	26	8-22
	200	210	335	295	28	8-22		200	210	335	295	30	12-22
	250	230	390	350	28	12-22		250	230	405	355	32	12-26
	300	300	440	400	28	12-22		300	300	460	410	32	12-26
	350	365	500	460	30	16-22		350	365	520	470	36	16-26
	400	410	565	515	32	16-26		400	410	580	525	38	16-30
	450	430	615	565	32	20-26		450	430	640	585	40	20-30
	500	450	670	620	34	20-26		500	450	715	650	42	20-33
	600	510	780	725	36	20-30		600	510	840	770	48	20-36

Technical Parameters

Size	DN32-DN600	DN650-DN2000
Working pressure	16Bar	10Bar
Shell	24Bar	15Bar
Seal	18Bar	11Bar
Operating Temperature	-45°C~+150°C
Operating Environment	Ballast and bilge system Chemical processing Desalination plants Drilling rigs Drinking water Dry powder Food and beverage Gas plants HAVC Mining industry Paper industry Sand handling Seawater Sugar industry Thermo technical water treatment Waste water
Driving Method	Hand Lever Worm Gear Electric Pneumatic

Executive Standards

Design Standard	EN 593, MSS SP67, API 609, BS 5155
Inspection & Test	API 598, ISO 5208, EN 12266
End Standard	ANSI B16.1 CL. 125LB & B16.5 CL. 150LB
	AS 2129 Table D & E
	BS 10 Table D & E
	DIN 2501 (PN6, PN10, PN16)
	EN 1092 (PN6, PN10, PN16)
	ISO 2531 (PN6, PN10, PN16), 7005 (PN6, PN10, PN16)
	KS B / JIS B 1511 / 2210 (5K & 10K)
	MSS SP44 CL. 150LB
	AWWA C207
	SABS 1123 Table 1000/3 & Table 1600/3
Face to Face	ISO 5752, EN 558, MSS SP67, API 609, DIN 3202
Top Flange	ISO 5211

Advantages of Silent Check Valve

01/

Eliminates Water Hammer
Spring-loaded closure prevents sudden reverse flow, reducing pressure spikes and protecting system components.

02/

Quiet Operation
Designed for sound-sensitive environments (hospitals, residential buildings, hotels), this valve operates with little to no noise during shut-off.

03/

Compact Structure, Flexible Installation
Compared to swing check valves, silent models are more compact and can be installed horizontally or vertically (based on specific models).

04/

Prevents Backflow Contamination
Rapid closure ensures no reverse flow, avoiding contamination or system malfunction.

05/

Low Maintenance, Long Service Life
With a simple, robust internal structure and fewer moving parts, these valves offer high durability and low maintenance costs.

06/

Wide Range of Applications
Suitable for use with cold and hot water, HVAC systems, compressed air, and pump discharge lines—Especially where noise and water hammer control are critical.

Applications of silent check valves

Water treatment and water supply applications.
Oil and gas refinery and transmission systems.
They are used in chemical processing industries.
Steam power generation plants.
Pharmaceutical applications.
Paper and pulp industries.
Research or testing applications.

Composition of Silent Check Valve

The silent check valve consists of the following main components:

Valve body

Seat

Disc

Guide body

Bushings

Spring

Working Principle of Silent Check Valve

Forward Flow

When the medium (such as water, air, or oil) flows in the correct direction, the valve disc automatically opens under fluid pressure, allowing free passage.

Reverse Flow Prevention

When flow stops or reverses, the disc closes rapidly with help from

Spring Assistance

The built-in spring applies back pressure to the disc, speeding up closure.

Optional Damping Design

Some models use a two-stage closing action (fast-close followed by soft-close) to eliminate impact from sudden shut-off.

Noise Reduction

The valve design incorporates optimized disc geometry, spring tension, and sealing materials to minimize vibration and sound during closure.

FAQ

Q: Are you a manufacturer or trading company?

A: We are valve manufacturer and factory, and not trading company.

Q: What's your product range?

A: We can produce Butterfly valve, Gate valve, Check valve, Y strainer, Rubber Joint By ISO/ANSI/DIN/JIS/ EN/GOST/AS standard.

Q: Is there any stock in your factory? And how about your lead time?

A: We stock valves with normal sizes. The lead time depends on your quantity, Generally 30-35 days.

Q: What certificates will you provide?

A: We can provide CE/ ISO / WRAS.
After-sales service
18 months year warranty for all kinds of products.
As an experienced manufacturer, you can rest assured of the quality and sales service.

Q: Payment?

A: T/T, L/C, OA, D/P, D/A.

Q: Transportation?

A: Transported by DHL, UPS, EMS, FedEx, SF, by Air, by Sea.

Q: Do you provide free sample?

A: Free sample is OK for us.

Q: Do you accept custom design on size?

A: Yes, if the size is reasonable.

We're well-known as one of the leading silent check valve manufacturers and suppliers in China. Please feel free to buy high quality silent check valve at competitive price from our factory. For more information, contact us now.

Ductile Iron Silencing Check Valve, silent check valve