PVDF Diaphragm Valve

PVDF diaphragm valves handle the media that defeat other plastics — concentrated acids, halogens, and high-purity fluids — while the diaphragm design keeps the flow path free of dead space, packing, and contamination. We build ours from 100% virgin PVDF and offer them in true union, flanged, and pneumatic configurations for chemical processing, semiconductor, and water-treatment duties.

A diaphragm valve isolates the working media behind a flexible diaphragm, so no stem packing ever contacts the fluid and there is no crevice to trap or contaminate it. In PVDF, that makes it one of the most reliable choices for aggressive corrosive service and for ultrapure applications where leaching and particle generation must be near zero.

PVDF chemical compatibility

PVDF resists a wide range of high-concentration acids, halogens, and oxidizers. The table summarises typical ratings — ◎ excellent, ○ limited, × not recommended — across temperature.

Media	Rating
Sulfuric acid 98%	◎ 20–80 °C (○ at 100 °C)
Hydrofluoric acid 40–55%	◎ 20–100 °C
Hydrochloric acid 35%	◎ 20–120 °C
Chlorine gas (wet / dry)	◎ 20–120 °C
Hydrogen peroxide 35–50%	◎ 20–100 °C

PVDF is not suited to some strong polar solvents, esters, ketones, and certain amines, which can swell or attack the polymer. Acetone, butyl acetate, THF, and aniline, for example, are only limited at 20 °C and not recommended at 40 °C and above. For a specific medium and temperature, send us the details or see our PVDF chemical resistance guide.

Why our PVDF diaphragm valves

• 100% virgin PVDF. We use only new resin — never regrind — with imported Arkema Kynar® or Solvay Solef® grades available. The result is high purity, resistance to embrittlement, and effectively zero leaching for ultrapure service.
• No-glue chemical joining. Connections are made by socket fusion or infrared (IR) butt welding, so the joint fuses at the molecular level and is as strong as the pipe itself — eliminating the leak paths of a bonded or threaded joint.
• Double-diaphragm design, low compression set. The diaphragm assembly delivers a tight, durable seal, and the body distributes closing pressure evenly. That lowers the required closing torque and keeps flow regulation stable and repeatable.
• No dead space, no packing wear. The diaphragm seals the media completely, so there is no stem packing to wear and nowhere for media to stagnate or contaminate the line.
• Customisable. Bonnet, compressor, stem, bolts, and diaphragm can all be specified — for example 304 or 316 stainless steel stems and fasteners.

Diaphragm material options

The diaphragm is the key wetted part. We offer several combinations, selected to your media:

Diaphragm	Best suited to
EPDM + PTFE	Acetone, alcohols, alkalis, ambient water
FKM + PTFE	Oils, aromatics, strong acids, high temperature
EPDM + FEP (F46)	High-pressure gas, pure water, anti-permeation duty

Configurations

True union PVDF diaphragm valve

A compact, manually operated valve in DN15–DN50 (1/2″–2″) with union end connectors. The unions let you unscrew and lift the valve straight out for cleaning or replacement without cutting pipe — ideal for skid-mounted dosing systems and instrument panels where space is tight and maintenance is frequent.

Flanged PVDF diaphragm valve

Available in DN15–DN150 (1/2″–6″) to ANSI, DIN, or JIS flange standards. The bolted flange gives far greater structural strength against pipe stress, vibration, and thermal movement, and is the standard choice on larger-bore and permanent process lines. Compared with the true union version, the flanged valve offers higher pressure capability and better tolerance to pipe misalignment, at the cost of more weight and a more involved removal.

Pneumatic PVDF diaphragm valve

The same valve in DN15–DN150 with a corrosion-resistant all-plastic actuator, in double-acting or spring-return (fail-safe) action. An adjustable closing-stroke stop protects the diaphragm and extends its life, and the valve accepts the usual control accessories — solenoid valve, limit switch / position feedback, positioner, and air filter regulator — for automated dosing and emergency-shutdown duties.

Specifications

Body material	PVDF (100% virgin; Arkema Kynar® / Solvay Solef® option)
Size range	DN15–DN150 (1/2″–6″); true union DN15–DN50
Pressure rating	PN10 (derates with temperature)
Max temperature	~120 °C
Body design	Weir type
Diaphragm	EPDM + PTFE / FKM + PTFE / EPDM + FEP
Connection	True union / flanged (ANSI / DIN / JIS)
Operation	Manual / pneumatic (double-acting or spring-return)
Stem & bolts	304 or 316 stainless steel option

Typical applications

PVDF diaphragm valves are specified where corrosion resistance and purity both matter: semiconductor and ultrapure-water (UPW) systems and strong-acid cleaning lines, mixed-acid transfer and dosing in chemical processing, and exhaust scrubbers and chlor-alkali service. To weigh PVDF against the other thermoplastics, see our plastic valve material selection guide,or explore our full range of PVDF valves..

Why buy PVDF diaphragm valves from Huiya

Our PVDF diaphragm valves are built for the most aggressive acids, halogens, and ultrapure service, supplied factory-direct — so you get the right configuration, competitive pricing, and a fast reply with no trading-company markup.

• ✅ Factory-direct — our own 2,000+ m² plant in Zhejiang, no middleman
• ✅ 100% virgin branded resin, fully traceable; produced at an ISO 9001-certified facility; material test reports on request
• ✅ Low MOQ — 20 pieces; samples available; OEM / custom welcome
• ✅ Fast lead time — about 7 days standard, 14 days custom
• ✅ 12-month warranty

Frequently asked questions