Do you offer custom-made special size or non-standard pressure rating?

Custom solutions are available. Kindly provide diameter,pressure,temperature,medium and pipeline conditions for technical confirmation.

Can these FEP-lined check valves work under vacuum condition?

Limited vacuum service is acceptable. Please advise exact vacuum degree and medium for our technical evaluation, as fluorine-plastic lining may suffer peeling under high vacuum.

What anti-corrosion precautions should be taken during storage?

Store in dry indoor environment.Keep away from sharp objects to avoid lining damage.Valve should stay half-open state for long-time storage. Do not expose to direct sunlight for long periods.

High-Performance Lined Check Valve for Industrial Water Systems

Name: High-Performance Lined Check Valve for Industrial Water Systems
Brand: Naifulong Group Co., Ltd.
SKU: 2328396465

Zhejiang, ChinaNaifulong Group Co., Ltd.

US$10.00-5,000.00

1 Set

Product profile

Customization

Available

Media

Acid

Temperature

Ordinary Temperature

Model NO.

custom

Material

Stainless Steel

Connection Form

Flange

Structure

Swing

Pressure

Low Pressure

Function

Sfcv Rubber Lobe

Sealing Form

Bellows Globe Valve

Flow Direction

Unidirection

Standard

GB/T 12224 , Hg/T3704

Application

Industrial Usage, Water Industrial Usage

Model No

H44f46 H41f46

DN

DN15-DN500

Pn

Pn0.6-2.5

Color

Green,Blue,Red

Transport Package

Wooden Case

Specification

Customizable

Trademark

NFL

Origin

Zhejiang China

Key features

Swing check valve:The main models include:fully lined H44F46 and H74F46 single flap swing series and H76F46 double flap swing series.

The Structural forms are:the valve flaps rotate and open and close around the (pin) axis outside the seat to prevent medium backflow.

The characteristics of the H44F46 and H74F46 check valve are:the shafts and disc are designed as a whole ,all lined with FEP shafts,embedded in a special groove formed between the body and bonnet .

In addition,the characteristics of the H72F46 and H76F46 check valves are:in addition to the body and disc,the return spring is also completely lined with corrosion resistant fluoroplastic.

And the spring is reasonably designed,which make the disc can also generate sufficient sealing pressure in the low pressure area,emsuring the reliability of sealing the valve in the low pressure area

Lift Vertical check valve:The main models include fully lined H40F46,H42F46,and H71F46 lift vertical check valve.

H40F46 is a new type of structure with a hemispherical disc.The common feature is that the fluorine lined flap moves up and down along the body path axis.

Lift check valve:The main models include:a fully lined H40F46,H42F46,and H71F46 lift vertical check valves.H40F46 is a new type of structure with a hemispherical disc.

The common feature is that the fluorine lined flap moves up and down along the body path axis.

Fully lined H41F46 straight through lift check valve.Its structural characteristics are:fluorine lined disc perpendicular to the body inlet and outlet axis for lifting movement,to close and open.

Company profile

Importers and ExportersPatents AwardedExhibition ExperienceHigh Repeat Buyers Choice

Naifulong Group Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples CertifiedExport Year: 18 Years CertifiedNearest Port: Ningbo Port, Shanghai PortAverage Response Time: ≤0.03h

AI-Powered supplier vetting

SummaryThe supplier is a Zhejiang-based high-tech manufacturer focused on pumps, vacuum equipment, valves, hardware, metal products, and industrial automation components. It reports over 40 patents, recent new-product development, ODM services, and OEM work for well-known brands. Production is supported by machining, injection, CNC, welding, and pipe-machining facilities, 12 quality inspectors, documented finished-product inspection instructions, and valid contracts with associated subcontractors. Quality and sustainability systems include ISO9001:2015, ISO45001:2018, and ISO14001 certifications, while regular fire drills were conducted during the past year. The supplier has 18 years of export experience, with exports representing 51%–70% of total sales, and has participated in the Russian PVC Exhibition. However, it reports no SDK, inventory, overseas warehouse, overseas showroom, overseas agent or branch, and zero countries with overseas service coverage. Financial records are identified for 2023–2025, but no...

Supplier typeThe supplier identifies itself as a national high-tech enterprise, Zhejiang Made unit, and specialized and sophisticated enterprise. Its stated business scope covers manufacturing, pumps and vacuum equipment, valves and plugs, hardware, metal products, and industrial automation products, indicating a diversified industrial equipment manufacturer.

CertificationsThe supplier reports ISO9001:2015, ISO45001:2018, and ISO14001 management-system certifications. It also reports other product-compliance certification, but the specific standard is not identified, so the assessment is supported primarily by the named management-system certificates.

After-Sales capabilityThe supplier reports no in-stock service capability, overseas warehouse, overseas showroom, overseas agent, or overseas branch, and lists zero countries where overseas services are offered. These stated limitations indicate weak overseas after-sales and local-service coverage.

R&D capabilityThe supplier reports more than 40 patents, including multiple national patents, and states that it developed new products during the past year. It also provides ODM and OEM services, although it explicitly reports no available SDK.

Production capacityProduction evidence includes valid manufacturing-capacity contracts with associated subcontractors, machining, injection, CNC, welding, and pipe-machining facilities, 12 quality inspectors, documented inspection instructions, and a one-month peak-season lead time. The supplier also reports 12 qualified service-capability suppliers and written procedures with follow-up records, supporting substantial production and quality-management capability.

Customization capabilityThe supplier reports customization from samples, ODM services, and OEM services for well-known brands. These statements directly support the ability to deliver customer-specific products and manufacturing solutions.

Product Q&A

Q:What is the difference between F46 (FEP) and F4 (PTFE) lining?

F46 (FEP) features better melt-processability and superior permeation resistance,working from -50 to 150. PTFE (F4) withstands higher temperature up to 180,yet it is more difficult for forming.

Q:How to choose between H41F46 and H44F46?

H41F46 (Lift check valve): Excellent sealing performance, for clean corrosive media, small & medium size, horizontal pipeline installation. H44F46 (Swing check valve): Low flow resistance, preferred for large size and pump outlet service, install horizontally only.

Q:Can H40F46 floating-ball check valve be mounted on horizontal pipelines?

H40F46 floating-ball check valve must be installed on vertical pipelines with upward flow direction. It can handle media containing minor solid particles.

Q:What are the standard pressure, temperature and applicable media?

Standard pressure class PN10 / PN16. Working temperature: -50 ~ 150. Suitable for strong acid, strong alkali, oxidizing and other highly corrosive chemical media.

Q:Brief introduction for each model

H44F46:Flanged FEP-lined swing check valve,horizontal installation,for large-diameter pump outlet. H74F46:Wafer-type FEP-lined swing check valve,compact dimension for limited installation space,horizontal installation. H40F46:Flanged FEP-lined floating-ball check valve,vertical installation (flow upward),tolerates slight particle-containing medium. H41F46:Flanged FEP-lined lift check valve,good sealing,for clean medium, horizontal installation,small-medium size.