Schubert & Salzer – Type 8050 – GS3 Sliding Gate Valve

Overview

The Schubert & Salzer Type 8050 GS3 is a manually operated sliding gate valve designed for precise on/off and throttling control of liquid and gaseous media in industrial applications. It uses a handwheel actuator to drive a sliding disc across a fixed disc, providing accurate flow regulation with low actuation force — even under high differential pressure conditions.

The GS3 series is offered in a flangeless wafer-style body that self-aligns between ASME B16.5 and DIN EN 1092-1 flanges. Available in stainless steel and carbon steel constructions, the Type 8050 handles media temperatures from -76°F to +662°F and is rated to ANSI 150, 300, and 600 pressure classes. It meets the requirements of TA-Luft 2021 for fugitive emissions and is available with optional ATEX non-electrical marking for hazardous area installations.

Features & Benefits

• Sliding gate design delivers precise flow control with high Cv-values across a wide size range
• Low actuation force enables simple, reliable manual operation — including at high differential pressures
• Flangeless wafer body (ANSI B16.5 RF and DIN EN 1092-1 Form B compatible) minimizes installation length and weight, especially in larger sizes
• Exceptionally low leakage rates — IEC 60534-4 Class IV-S1 achievable with carbon/stainless or SFC disc pairs
• Wide temperature range: -76°F to +662°F media temperature; -22°F to +212°F ambient
• Multiple disc material options (SFC carbon, STN2) allow matching of valve to media compatibility requirements
• Self-adjusting PTFE packing (carbon-filled) with stainless steel spring for consistent stem sealing
• Optional metal bellows (316 Ti) provides secondary stem sealing for critical or zero-leakage applications
• Meets TA-Luft 2021 requirements; ISO 15848-1 tested for shaft and body sealing
• Optional ATEX non-electrical classification: II 2G Ex h IIC T6…T1 X Gb / II 2D Ex h IIIC 85°C…530°C X Db
• CRN Certificate, EU Declaration of Conformity, and UKCA Declaration of Conformity available
• Stroke indicator provides visual position reference during operation

Technical Specifications

• Sizes: 1/2″ – 10″
• Body design: Flangeless wafer (self-aligning) for ASME B16.5 RF or DIN EN 1092-1 Form B flanges
• Pressure ratings: ANSI 150 (1/2″–10″); ANSI 300 (1/2″–6″); ANSI 600 (1/2″–4″); DIN 580 psi (1/2″–6″); DIN 1450 psi (1/2″–4″); 235–363 psi (8″–10″)
• Media temperature: -76°F to +662°F
• Ambient temperature: -22°F to +212°F
• Body material (stainless): CF8M; Head section: 316 Ti or 316L
• Body material (carbon steel): ASTM A216 WCB; Head section: 316 Ti or 316L
• Actuating stem: Stainless steel 316 Ti, roller burnished
• Packing: PTFE (carbon-filled), self-adjusting; spring SST 301
• Sliding disc options: Special carbon (SFC), STN2/STN3 coated
• Fixed disc: Stainless steel 316 Ti, coated (STN2 option)
• Optional bellows: Stainless steel 316 Ti
• Leakage class (carbon/SFC disc pair): IEC 60534-4 Class IV-S1; EN 12266-1 Class E
• Leakage class (STN2 disc pair): IEC 60534-4 Class IV-S1; EN 12266-1 Class F
• Flange gaskets: ANSI B16.21 or DIN EN 1514-1 (customer-supplied)
• Fugitive emissions: ISO 15848-1 rated; meets TA-Luft 2021
• Cv range: 4.6 (1/2″) to 1056 (10″) at 100% stroke — linear and equal-percentage characteristics available

Applications

• On/off shutoff and precise throttling of liquid and gaseous process media
• Chemical processing — neutral and aggressive media
• Oil & gas and energy production
• Water and wastewater treatment
• Pulp & paper manufacturing
• Food & beverage processing
• Pharmaceutical and cosmetics production
• Textile industry applications
• Metallurgy and high-temperature industrial processes
• Hazardous area installations (with ATEX non-electrical option)
• Fugitive emissions-critical systems requiring TA-Luft 2021 compliance

Type 8050 GS3 Accessories

• Metal Bellows (316 Ti) – Optional secondary stem seal for zero-leakage or fugitive emissions-critical service
• Limit Switch – Optional position feedback device for remote monitoring of valve open/closed status

Documentation