Schubert & Salzer – 8638 GS3 Flanged Sliding Gate Motor Valve

Overview

The Schubert & Salzer Type 8638 GS3 is a flanged sliding gate motor valve combining the precision of a high-resolution fast stepper actuator with ASME B16.5 flange connections for direct installation in US process piping. Designed to ASME standards, the Type 8638 handles steam, liquids, gases, and other media with positioning accuracy of ±0.2% even at a valve stroke of only 6 mm — the same high-precision stepper platform as the Type 8038 GS3, now in a flanged body configuration.

Available in sizes 1/2″ to 8″ with stainless steel CF8M or carbon steel WCC body options rated for ANSI #150 and #300, the Type 8638 operates with 2 kN or 5 kN thrust across a voltage range of 100–240V (50/60 Hz) or 24V AC/DC. The actuator is rated IP67, and super capacitor technology provides a built-in fail-safe return to a defined position on power loss. Media temperatures range from -76°F to 662°F.

Features & Benefits

• High-resolution fast stepper actuator delivers ±0.2% positioning accuracy at a stroke of only 6 mm — the same precision platform as the Type 8038 GS3 in a flanged body
• Super capacitor fail-safe technology — on power loss, the valve automatically returns to its defined basic position without mechanical spring or external energy storage
• ASME B16.5 flange connections for direct installation in US process piping without adapter fittings
• Body material options: stainless steel CF8M and carbon steel WCC — both per ASME material requirements
• Thrust options of 2 kN and 5 kN with wide voltage input: 100–240V (50/60 Hz) or 24V AC/DC
• IP67 protection rating for use in submerged or high-washdown environments
• Available in sizes 1/2″ to 8″ for ANSI #150 and #300 flanged piping
• Media temperatures from -76°F to 662°F for broad process coverage
• Metal bellows accessory available for zero-emission stem sealing
• Analog stroke feedback and position electronics available for continuous position monitoring
• TA-Luft / ISO 15848-1 fugitive emissions compliance — standard approval
• EC Declaration of Conformity available

Technical Specifications

• Size: 1/2″ – 8″
• Pressure: ANSI #150; ANSI #300
• Body material: Stainless steel CF8M; Carbon steel WCC
• Media temperature: -76°F to 662°F
• Actuator: High-resolution stepper motor (control actuator or 3-point actuator)
• Positioning accuracy: ±0.2% at 6 mm stroke
• Actuator thrust: 2 kN; 5 kN
• Voltage: 100–240V (50/60 Hz); 24V AC/DC
• Fail-safe: Super capacitor technology — automatic return to defined basic position on power loss
• Protection class: IP67
• Connection: Flange per ASME B16.5
• Media compatibility: Steam, liquids, gases
• Approvals & Certificates: TA-Luft / ISO 15848-1, EC Declaration of Conformity

Applications

• High-precision modulating control requiring ±0.2% positioning accuracy in ASME B16.5 flanged US process piping
• Flanged process installations where the wafer-type Type 8038 GS3 stepper motor valve is not suitable
• Electric motor control of steam, liquids, and gases in US process plants where pneumatic supply is unavailable
• Applications requiring super capacitor fail-safe return to a defined position on power loss
• Submerged or high-washdown environments requiring IP67 actuator protection
• Low-emission process plants requiring TA-Luft / ISO 15848-1 fugitive emissions compliance
• Applications requiring continuous analog stroke position monitoring

Type 8638 GS3 Accessories

• Metal Bellows – Metal bellows stem seal for zero-emission applications requiring enhanced fugitive emissions control.
• Position Electronics – Integrated electronics for enhanced position control and signal processing with the Type 8638 GS3 stepper actuator.
• Analog Stroke Feedback – Continuous analog position feedback signal for real-time valve stroke monitoring and control system integration.
• Limit Switch – Position feedback accessory providing open/close status signal for process monitoring and control integration.
• Fail-Safe Feature (Super Capacitor) – Built-in super capacitor technology providing automatic return to defined basic position on power loss.

Documentation