Schubert & Salzer – Type 5020 Segmented Disc Valve

Overview

The Schubert & Salzer Type 5020 is a pneumatic segmented disc valve designed for precise control of liquids and steam, including media contaminated by particulate matter. Its wafer-type, flangeless body fits compactly between standard flanges, making it well-suited for both new installations and retrofit applications where space is limited.

Available in sizes from 1″ to 12″ (DN 25–DN 300) and rated for fluid temperatures from -76 °F to 428 °F (-60 °C to 220 °C), the Type 5020 delivers a high rangeability of 60:1 with a modified linear characteristic and near-zero leakage. Two actuator platform options — the standard pneumatic actuator and the compact MZ actuator — allow the valve to be configured for a wide range of system requirements.

Features & Benefits

• Suitable for particle-contaminated fluids — the segmented disc design resists clogging and wear in challenging media
• Bi-directional sealing — tight shutoff in both flow directions with leakage below 0.001% of Kvs
• Controllable against flow direction — provides flexibility in installation orientation
• Space-saving wafer design — flangeless construction reduces face-to-face length and overall system footprint
• High Kvs values — delivers strong flow capacity across the full size range
• 60:1 rangeability — wide control range with modified linear flow characteristic for precise throttling
• Low-noise operation — segmented disc geometry minimizes flow-induced noise and turbulence
• Robust all-stainless construction — wetted components in treated stainless steel 1.4112 for corrosion resistance and long service life
• NAMUR-compatible positioner mounting — compatible with digital positioners including IO-Link, Ex-Pro, and integrated process controller (IPC) versions
• Optional ATEX non-electrical explosion-proof rating — available for hazardous area installations

Technical Specifications

• Valve type: Segmented disc valve, pneumatically actuated
• Body design: Flangeless, wafer-type for flanges acc. to DIN EN 1092-1, Form B
• Size range: DN 25–DN 300 (1″–12″)
• Nominal pressure: DN 25–DN 150: PN 25 acc. DIN 2401; DN 250–DN 300: PN 16 acc. DIN 2401 (other pressure ratings on request)
• US pressure ratings: 1″–6″: 363 psi; 10″–12″: 232 psi
• Fluid temperature range: -60 °C to 220 °C (-76 °F to 428 °F)
• Ambient temperature (digital positioner): -10 °C to +75 °C
• Ambient temperature (analog positioner): -15 °C to +60 °C
• Rangeability: 60:1
• Flow characteristic: Modified linear
• Leakage: <0.001% of Kvs
• Body material: Stainless steel 1.4301 / 1.4308 (CF8M); Carbon steel A738
• Disc & plate material: Stainless steel 1.4112, treated
• Rack material: Stainless steel 1.4112, treated
• Pressure spring: Stainless steel 1.4310
• Slide ring: Stainless steel 1.4112 or bronze (alternative)
• Positioner body: Anodized aluminum / synthetic
• Pressure Equipment Directive (DGRL 2014/68/EU): DN 25–DN 150 up to Category I; DN 200–DN 300 up to Category II
• Ex-proof (optional): ATEX non-electrical — II 2G Ex h IIC T6–T2 X Gb; II 2D Ex h IIIC 85 °C–220 °C X Db
• Certifications: EC Declaration of Conformity; UKCA Declaration of Conformity

Applications

• Control of process liquids contaminated by particulate or fibrous matter
• Steam control in industrial heating and process systems
• Chemical processing — corrosive or aggressive fluid handling
• Food & beverage processing — compatible with hygienic process requirements
• Water treatment — throttling and flow control in treatment plants
• Pulp & paper — handling of slurries and contaminated process streams
• Tire, rubber & plastics manufacturing — high-temperature fluid control
• Energy & power generation — steam and condensate control
• Metallurgy & building materials — high-pressure liquid and steam service
• Hydrogen applications — where robust, tight shutoff is required

Models / Configurations

• Type 5020 (Standard Actuator) – Available DN 25–DN 300 (1″–12″); five actuator sizes (250, 500, 1000, 1500, and 3000 cm² effective area) to match pipe size and differential pressure requirements; pilot pressure 5 bar
• Type 5020-MZ (Compact MZ Actuator) – Available DN 25–DN 80 (1″–3″); compact MZ 20″ and MZ 30″ actuator configurations; pilot pressure 5–6 bar; ambient temperature range -40 °C to +80 °C; suited for installations with tight clearances

Type 5020 Accessories

• Digital Positioner Type 8049 – NAMUR-mount digital positioner available in 2-wire, 4-wire, Ex-Pro explosion-proof, IO-Link, and integrated process controller (IPC) configurations
• Limit Switch – End-position feedback for open/closed status indication
• Position Feedback Transmitter – Continuous valve position signal output for control system integration
• Manual Override – Allows manual valve operation during actuator maintenance or power loss
• Solenoid Valve – For pneumatic actuator control and fail-safe positioning

Documentation