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.

High Performance Diaphragm Valve with Anti Corrosion and Resistance

Name: High Performance Diaphragm Valve with Anti Corrosion and Resistance
Brand: Naifulong Group Co., Ltd.
SKU: 2324639445

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, CF8

Stem

35, 1Cr13, 1cr18ni19

Lining

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

Diaphragm

PTFE(F46)/Cr

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 national high-tech enterprise with extensive patents and export experience, although it lacks certain logistical capabilities like overseas warehouses and in-stock services. It holds multiple ISO certifications, indicating a commitment to quality and sustainability, and has a reliable financial profile over recent years. The supplier is actively involved in product innovation, offering ODM and OEM services, but does not provide SDKs. Despite a lack of overseas service branches, it participates in international trade shows and has a robust production process with multiple facilities and quality control inspectors.

Supplier typeThe supplier is a national high-tech enterprise involved in manufacturing various equipment and components, exporting 51%-70% of its products.

CertificationsThe supplier holds ISO9001:2015, ISO45001:2018, and ISO14001 certifications, demonstrating adherence to quality and environmental standards.

After-Sales capabilityThe supplier lacks overseas warehouses and service capabilities, but it is close to major ports for distribution.

Financial creditThe supplier has maintained consistent financial capacity and cash flow over the past three years, indicating financial stability.

R&D capabilityThe supplier has introduced new products and offers ODM and OEM services, though it lacks SDK availability.

Production capacityThe supplier has a comprehensive production setup with facilities like CNC machining and welding, supported by a valid subcontractor network.

Customization capabilityThe supplier can customize products from samples and provides both ODM and OEM services.

Client casesSupplier participates in international trade shows such as the Russian PVC Exhibition, indicating active engagement with global markets.

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.