Schubert & Salzer – Type 8020 GS3 Sliding Gate Control Valve
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Overview
The Schubert & Salzer Type 8020 GS3 is a diaphragm-actuated sliding gate control valve designed for modulating and high-speed on/off control of steam, liquids, gases, and other media across a wide range of process applications. Available in sizes 1/2″ to 10″ and rated to 145/580 psi, 1,450 psi, and ANSI #150, #300, and #600, the Type 8020 is the most pressure-capable and broadly specified valve in the Schubert & Salzer sliding gate control valve lineup. Media temperatures range from -76°F to 662°F, with special versions available on request.
The Type 8020 features a NAMUR interface for universal positioner assembly, supporting pneumatic, electro-pneumatic, and digital positioner configurations. Body and cover material options include stainless steel (CF8M body / 316L cover) and carbon steel (WCB body / 316L cover) for maximum application flexibility. TA-Luft / ISO 15848-1 and DNV GL certifications are standard approvals, alongside CRN and SIL compliance. The wafer-type body installs between standard flanges with minimal face-to-face length.
Features & Benefits
- Diaphragm-actuated GS3 sliding gate design for high-speed, high-cycle on/off and modulating control of steam, liquids, gases, and other media
- NAMUR interface enables universal positioner assembly — compatible with pneumatic, electro-pneumatic, and digital positioners
- Widest size range and highest pressure ratings in the GS3 control valve lineup: 1/2″ to 10″, up to 1,450 psi and ANSI #600
- Dual body material options: stainless steel CF8M / 316L cover for corrosive media; carbon steel WCB / 316L cover for general industrial service
- Broadest temperature range in the sliding gate series: -76°F to 662°F; special versions on request
- Wafer-type body minimizes face-to-face length and installation space in flanged piping systems
- Metal bellows accessory available for zero-emission stem sealing and enhanced fugitive emissions control
- TA-Luft / ISO 15848-1 fugitive emissions compliance — standard approval
- DNV GL Certificate for offshore and marine process installations
- Optional ATEX non-electrical approval (II 2G Ex h IIC T6…T1 X Gb; II 2D Ex h IIIC 85°C…530°C X Db) for hazardous area installations
- CRN Certificate, Safety Manual with SIL manufacturer’s declaration, EC and UKCA Declarations of Conformity available
Technical Specifications
- Size: 1/2″ – 10″
- Pressure: 145/580 psi; 1,450 psi; ANSI #150; ANSI #300; ANSI #600
- Body material: Stainless steel CF8M with 316L cover; Carbon steel WCB with 316L cover
- Media temperature: -76°F to 662°F (special versions available on request)
- Actuator: Diaphragm actuated; NAMUR interface for universal positioner assembly
- Connection: Wafer type (installs between flanges)
- Media compatibility: Steam, liquids, gases
- ATEX (optional): II 2G Ex h IIC T6…T1 X Gb; II 2D Ex h IIIC 85°C…530°C X Db
- Approvals & Certificates: CRN Certificate, DNV GL Certificate, TA-Luft / ISO 15848-1, EC Declaration of Conformity, UKCA Declaration of Conformity, Safety Manual with SIL manufacturer’s declaration
Applications
- High-speed, high-cycle on/off switching of steam, liquids, and gases in demanding process applications
- Modulating control in wide-range process applications with pneumatic, electro-pneumatic, or digital positioners
- High-pressure service up to 1,450 psi and ANSI #600 in stainless or carbon steel piping systems
- Offshore and marine process installations requiring DNV GL certification
- Low-emission process plants requiring TA-Luft / ISO 15848-1 fugitive emissions compliance
- Zero-emission applications requiring metal bellows stem sealing
- Hazardous area installations requiring ATEX non-electrical approval
- Applications requiring CRN certification for Canadian pressure vessel and piping compliance
- Applications requiring SIL compliance
Type 8020 GS3 Accessories
Positioners
- Pneumatic Positioner – For analog pneumatic control signal integration with the Type 8020 GS3 sliding gate valve via the NAMUR interface.
- Electro-Pneumatic Positioner – For 4–20mA or other analog signal control loop integration via the NAMUR interface.
- Digital Positioner – For advanced digital control, diagnostics, and fieldbus integration via the NAMUR interface.
- Without Positioner – Direct pneumatic supply for on/off operation without positioner.
Additional Accessories
- Metal Bellows – Metal bellows stem seal for zero-emission applications requiring enhanced fugitive emissions control.
- Limit Switch – Position feedback accessory providing open/close status signal for process monitoring and control integration.
- Position Feedback – Analog or digital position feedback device for continuous valve position monitoring.
- Manual Override – Allows manual operation of the valve independent of pneumatic supply for maintenance or emergency use.
- Pilot Valve – Solenoid pilot valve for pneumatic actuation control of the Type 8020 GS3.
