Why is 35 carbon steel adopted for the stem? Isn't it vulnerable to corrosion?

Diaphragm separates process media completely, stem will not touch corrosive fluid. 35# carbon steel as standard. For humid outdoor environment, upgrade stem to 2Cr13 / 410 stainless steel.

Will the valve cause external leakage? Does it have a stuffing box?

No stuffing box, zero stem external leakage. Media is fully isolated by diaphragm. Possible leakage only from flange gasket or damaged diaphragm.

Will the lining peel off?

Molded F46/PFA lining will not peel under rated condition.Over-temperature,heavy vacuum or sharp thermal cycling may cause blister & delamination.

What causes internal leakage when the valve cannot close tightly?

Possible causes: insufficient closing torque, solid particles stuck on sealing surface, aged / cracked diaphragm. Solution: apply proper torque, clean weir seat, replace diaphragm if damaged.

Stable Diaphragm Valve with Customizable Features for Industrial Applications

Name: Stable Diaphragm Valve with Customizable Features for Industrial Applications
Brand: Naifulong Group Co., Ltd.
SKU: 2324385585

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

Actuator

Manual

Connection

Flanged Diaphragm Valve

Material

Stainless Steel

Structure

Roof Type Diaphragm Valve

Pressure

Low Pressure

Flow Direction

Bidirectional

Usage

Emptying, Drain

Standard

GB, ANSI

Body,Bonnet,Disc

Ht250, Wcb, P

Stem

35, 1Cr13, 1cr18ni19

Lining

FEP(F46) PCTFE(F3) PTFE(F4)Po

Diaphragm

Nut

45, 0Cr18Ni9

Handwheel

Ht200, Wcc

Transport Package

Wooden Case

Specification

Customizable

Trademark

OEM

Origin

China

Key features

Diaphragm valve is a special type of valve with cutoff function.

Its disc is composed of a diaphragm made of steel disc and soft materials(rubber and fluoroplastic composite),and separate the body inner cavity from the bonnet inner cavity.

When the handwheel is operated clockwise,the stem will move downward,and the disc will drive the diaphragm downward to cut off the passage,otherwise,the valve will open.

The composite membrane separates the lower inner cavity of the body from the inner cavity of the bonnet,and forms a DC channel with it,completely isolating the the stem,disc and other internals

The membrane made of FEP(Teflon) fluoroplastics and synthetic rubber and the valve with a (Teflon) fluoroplastic lining layer can be used for various highly corrosive medium.

As actuator,the diaphragm is prone to fatigue fracture due to frequent opening and closing.Therefore,it should be tested for working conditions,media,and characteristics,and replaced regularly.

Design Specification:Comply with HG/T 3704. GB/T 12224. ASME B16.34.

Drive mode :Manual, Pneumatic (normally open or normally closed ).Electric.

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 operating temperature range for fluorine-lined diaphragm valves?

Working temperature for F46(FEP) lined:-20~150,continuous service <=120.PFA lining up to 180.Do not exceed temperature limit,fluoroplastic will creep and blister.

Q:Can it work under negative pressure / vacuum conditions?

Standard G41F46 is NOT for high vacuum.For negative pressure/vacuum,please select vacuum-type with PFA lining & reinforced diaphragm,avoid lining collapsing.

Q:What is the typical service life of the diaphragm?

Diaphragm is wearing part.Normal service life 30,000-50,000 cycles.Under high-frequency high-temp/heavy corrosion,inspect & replace every 1-2 years.Spare diaphragm available.

Q:Can fluorine-lined diaphragm valves be used for flow regulation?

Mainly for ON-OFF cut-off service.NOT recommended for long-term throttling at partial open position,diaphragm will get fatigue damage.Short-time throttling is acceptable.

Q:What media are not suitable for F46-lined valves?

Resist most strong acid, alkali, oxidant & solvent. NOT suitable for molten alkali metal, elemental fluorine.