Check Valve

Your Professional Check Valve Supplier

WENZHOU ZHONGTOU VALVE/ZT VALVE is a leading valve manufacturer specializing in the production of various types of butterfly valves. Our products are extensively utilized in fluid systems across industries such as oil and gas, chemical, petrochemical, power generation, shipbuilding, and machinery.

Rich Experience

Our founders possess over three decades of experience in the stainless steel industry and have been exporting stainless steel products for more than 15 years.

Quality Control

We implement a scientific informatization management system and rigorous quality control processes. CAD and CAPP systems are employed for design and innovation, while PDM and ERP systems support our information management infrastructure.

Professional Team

We boast a highly skilled technical team, including five engineers with an average of over ten years of experience. This expertise enables efficient production arrangements and rapid business growth.

Sales Market

Our products are exported to over 30 countries, including European nations like Spain and the United Kingdom, North American markets such as the United States, Middle Eastern countries like Iran, and Southeast Asian countries such as Vietnam, Malaysia, and Singapore.

Parameter

Size	1/2''~12'' ( DN15~DN300)
Port	Full Port
Working Pressure	1.0~42Mpa
Connection Ends	Flange
Working Temp.	-40ºC~300ºC
Structure:	Plug
Type of connection	BW RTJ RF ETC.
Inspection & Testing	API598;API-6D
Applicable Medium:	Water / Oil / Gas / Causticity Medium
Pressure Rating:	PN10-PN100, 150LB-1500LB
Standard:	ANSI BS DIN JIS
Place of Origin:	Zhejiang, China
Customized support:	OEM, ODM
Certificate:	ISO9001:2008 CE
Warranty:	12 Months

Types of Check Valve

The check valves produced by our company mainly include the following types:

Stainless Steel Wafer Check Valve

A stainless steel wafer check valve is a valve with a stainless steel disc and body that prevents backflow of liquids or gases. They are used in a variety of applications, including water, heating, air conditioning, and compressed air.

Ss Lift Check Valve

A lift check valve is a crucial component in many piping systems, designed to prevent the backflow of media and ensure fluid consistency. As a type of check valve, its primary function lies in its ability to allow fluid flow in a single direction while preventing it from reverse direction.

Ss Vertical Check Valve

Thread stainless steel check valves are devices that allow fluid to flow in only one direction. They are commonly used in applications where backflow could cause damage or contamination, such as in water lines or chemical processing systems.

Main Material of Check Valve

ITEM	PART	MATERIAL
1	BODY	CF8M	CF8
2	DISC	CF8M	CF8
3	PIN	304
4	GASKET	PTFE
5	GASKET	PTFE
6	CAP	CF8M	CF8

Check Valve Installation Precautions

Match the Valve Flow Direction with the Fluid Flow

Wafer-type check valves require a specific flow direction. Install the valve so that its flow direction matches the fluid flow in the pipeline. Most valves will have an arrow indicating the correct direction. Verify the fluid flow before installation. Installing the valve incorrectly may cause failure and disrupt the entire system.

Keep the Valve Disc’s Operating Radius Clear

Ensure that no pipe fittings or obstructions are placed within the operating radius of the valve disc. Obstructions may block the disc’s movement, preventing the valve from opening or closing properly. This could damage the valve and reduce system efficiency.

Avoid Reducer Pipes Before or After the Valve

Do not install reducer pipes immediately before or after the check valve. Reducers can cause changes in fluid velocity and pressure, which may affect the valve’s function. This can lead to improper valve operation and reduce the overall efficiency of the system.

Ensure Enough Space Around Elbows

When installing a check valve near an elbow, make sure there is sufficient space. Elbows alter the flow of fluid and can affect the valve’s performance. Leave enough room around the elbow to ensure smooth fluid flow and avoid problems like pressure loss or flow dead zones.

Leave Adequate Space at Pump Outlets

When installing a check valve at a pump outlet, leave at least six times the valve’s diameter in space before the valve. This space ensures the valve disc can move freely, preventing issues like water hammer or pump reversal. Proper spacing helps maintain the valve’s efficiency and prevents failure due to excessive pressure.

Install the Valve According to Pipeline Orientation

The installation position of the check valve should match the orientation of the pipeline. For vertical pipelines, install the valve vertically. For horizontal pipelines, position the valve horizontally. Correct positioning ensures smooth valve operation and prevents issues like improper opening or closing.

Use an Expansion Joint Between the Check Valve and Butterfly Valve

When installing a check valve next to a butterfly valve, use an expansion joint between them. Do not connect the check valve directly to other valves. The expansion joint helps absorb thermal expansion and movement, reducing stress on both valves and ensuring proper operation.

Check Valve Customization Process

Consultation with Specialists

Engage in detailed discussions with our check valve specialists to thoroughly evaluate your application requirements and identify the most suitable customization options.

Design Determination

Select a standard check valve design that can be adapted to meet your specific needs, or explore the feasibility of a fully customized design based on your unique application requirements.

Material Specification

Choose the appropriate materials for the body, seal, and spring components, ensuring compatibility with the working fluid and operational conditions.

Component Parameter Definition

Specify critical parameters such as orifice diameter, port dimensions, and spring tension settings to achieve optimal performance characteristics.

Prototype Development and Validation

Develop a prototype of the customized check valve and perform rigorous testing to verify that it meets all specified performance criteria.

Packaging and Shipping

Packaging

Export standard

Carton or wooden case

Shipping

We will help you to choose the best shipping way according to your detail requirements. By sea, by air, or by express, etc.

productcate-1-1

Our Services

1. Pre-sale service

ZHONGTOU VALVE has a technical team with rich experiences in fluid control system, and we own industry-leading installation and inspection equipments. From drawing to installation, ZHONGTOU VALVE will provide you with the most professional services, technical assistance and quality assurance, to optimize your system operation in the best state.

2. Sale of services

● Fast delivery

We are a factory with a large inventory of stock, which guarantees that the goods will be shipped within the fastest day from the date of signing the contract.

● Quality Inspection

Our products are manufactured in strict accordance with national and international standards, and we test each product before delivery. If you would like to view our quality certification and various test reports, please ask us.

● Project Tracking

ZHONGTOU VALVE will establish a dedicated project team for every solution order, in order to provide a better aftermarket service.

3. After-sales service

According to the contract to provide product certification, production license, inspection reports, installation instructions.

In the correct installation and use of the product quality problems, the company will be responsible for in the end.

Our Factory

WENZHOU ZHONGTOU VALVE/ZT VALVE is located in Wenzhou City, Zhejiang Province, a place with a very developed stainless steel industry. There is a well-established and mature supply chain here. We mainly export to over 30 countries in North America, South America, Europe, Asia and other states. With persistence and effort, we have become one of the leading enterprises of valves fittings and flanges in China.

productcate-1-1

FAQ

Q: How does a check valve work?

A: To put it simply, check valves act as a one way gate within your system. Pressure applied to the inlet will be able to pass with little impedance. However, if pressure is applied to the outlet side, the valve will close. This keeps media (gasses or liquids) flowing in the desired direction and preventing backflow.

Q: What are three basic methods for testing a check valve?

A: Critical check valves are inspected/tested using three main methods: externally, internally and, in unique situations, in-line function testing.

Q: What is the life expectancy of a check valve?

A: A metal disc pivots on a hinge or trunnion to prevent reverse flow. Most larger-scale check valves use this design due to their simplicity. With a life span of five to seven years, these valves are often a component that needs to be replaced frequently.

Q: How do I choose a check valve?

A: Four pressure ratings should be considered for any check valve: operating pressure, system pressure, proof pressure, and burst pressure. Operating pressure is the pressure applied to the valve during normal operation throughout its life, both in the free flow and checked directions.

Q: Does a check valve prevent back pressure?

A: Like a backflow preventer, a check valve stops media from flowing through it in the reverse direction. Check valves, however, do not offer the degree of protection that backflow preventers do and therefore are not suitable for protecting drinking water sources.

Q: What is the maximum back pressure for a check valve?

A: The differential pressure between the inlet and outlet, at which an initial flow is passing through the valve. The differential pressure between the outlet and inlet, at which no flow is passing through the valve. Maximum allowable back pressure is rated to 1000 psi (69 bar) for 1/4, 200 psi (14 bar) for 3/8 to 1".

As one of the leading check valve manufacturers and suppliers in China, we warmly welcome you to buy discount check valve from our factory. All our products are with high quality and competitive price. Contact us for quotation.

ball valve for manufacturing, industrial butterfly valve, ball valve with gasket

Check Valve 316