Richter – KN PFA Lined Ball ValveEnquire Now

Manual Richter KN ball valve with thick PFA lining for H2SO4 and ClO2 isolation

KN Manual Lever Operated

Richter KN valve with pneumatic actuator for automated chemical isolation

KN On/Off & Control

Cutaway of Richter KN showing PFA lining and ENVIPACK stem sealing system

KN Cut-Away

BRAND: RichterCATEGORY: Ball Valves, Control Valves, Lined Valves,

Heavy-Duty Corrosion Protection and Shut-Off

The Richter KN PFA-lined ball valve is engineered for reliable shut-off and control in aggressive, corrosive and metal-reactive chemical duties where metallic valves cannot maintain long-term sealing integrity. Its thick fluoropolymer lining, robust ductile iron or steel body, and ENVIPACK stem sealing system deliver dependable performance under thermal cycling, vacuum conditions and high-corrosion environments.

Designed as a modular valve family—including KN, KNA, KNR, KNAR and KA-N variants—the series supports shut-off, control and drain duties from a single platform. This allows engineers to standardise on one system while specifying different body configurations, end connections and automation options to suit process requirements. PFA or antistatic PFA-L linings provide proven permeation resistance and protect wetted parts in applications involving strong acids, halogenated compounds, pickling solutions and high-purity chemicals.

Its low operating torque, high dimensional stability and actuator compatibility help maintain operational reliability across chemical production, minerals processing and high-purity manufacturing environments.

With decades of proven performance in acid, HF, HNO₃, pickling, and ultrapure chemical services, the Richter KN series is the go-to choice when standard materials fall short.

For technicians, engineers and production managers, this means:

Longer service life — Thick PFA/PFA-L lining and ENVIPACK stem sealing reduce chemical attack and minimise wear in corrosive or metal-reactive media.
Reliable shut-off and control — Precision ball and seat geometry maintain tight isolation and stable throttling under varying process conditions.
Lower maintenance effort — Zero-adjustment stem sealing and corrosion-resistant construction reduce intervention frequency and maintenance downtime.
Improved plant availability — Durable lining anchoring and robust body design limit failures caused by blistering, permeation or thermal distortion.
Operational flexibility — Modular variants (KN, KNA, KNR, KNAR, KA-N) allow one valve family to cover shut-off, control and drain applications across the plant.
Reduced environmental risk — ENVIPACK low-emission stem sealing supports fugitive-emission compliance in hazardous and regulated areas.
Simplified automation — Low torque requirements ensure compatibility with pneumatic and electric actuators without compromising sealing integrity.

Modular design. Superior sealing. Corrosion-proof peace of mind.

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Specifications

Series	KN/KNA
Design	Heavy Duty PFA Lined Ball Valve
Features	Thick PFA/PFA-L lining — Provides strong resistance to corrosion and permeation, ensuring long-term durability in aggressive chemical media. Vacuum-resistant lining anchoring — Prevents lining collapse or blistering during vacuum cycling and thermal variation. Robust ductile iron or steel body — Offers mechanical stability under temperature changes, vibration and pipeline loads. ENVIPACK stem sealing system — Multi-stage PTFE-based sealing arrangement supports low fugitive emissions and long-term sealing integrity. One-piece ball and stem design — Enhances mechanical strength, reduces potential leak paths and ensures smooth rotational operation. Low operating torque — Facilitates easy manual operation and reliable actuator performance in automated systems. Modular product family — KN, KNA, KNR, KNAR and KA-N share common components, simplifying spares management and maintenance planning. Transparent lining material — Allows visual quality inspection of lining integrity during manufacturing and maintenance. Wide temperature capability — Suitable for a broad temperature envelope (medium dependent), maintaining reliable shut-off across process ranges. Multiple end-connection options — Includes a selection of chemical-service flanges and special interfaces to suit diverse plant piping requirements.
Size Range	KN DN 15 – 200 / ½” – 8” KK DN 25 – 150 / 1″ – 6″
Pressure Rating	PN16 – 25 / ANSI 150
Temperatures	-60°C to 200°C
End Connections	KN Flanged / KK Wafer
Materials	PFA Lining (Standard) PFA-L antistatic lining (Optional)
Body Materials	Ductile Iron lined ASTM A395 Fully PFA Lined
Seat Materials	PTFE / Modified PTFE
Ball Materials	Stainless Steel Core lined with PFA / PFA-L
Options & Accessories	Manual, pneumatic actuators or electric actuators “V-Control ball” AL₂O₃ Ceramic ball 5 mm Pure PFA lining Full 316 SS body Bolt on steam jackets Valve positioners Switchboxes
Applications	Isolation, on/off and control for acids and other corrosive media throughout chemical process industries