Schubert & Salzer – Type 8090 Adjustable Sliding Gate Orifice

Overview

The Schubert & Salzer Type 8090 is a continuously adjustable sliding gate orifice designed for precise, repeatable flow rate control in demanding industrial applications. Built on the GS3 platform, it features a compact wafer-style intermediate flange construction that fits between standard ANSI or DIN flanges without added face-to-face length.

The Type 8090 can be manually adjusted and secured directly in the installed position during operation, making it well suited for hydraulic balancing, commissioning, and flow-setting tasks across cooling, energy, and process systems. Available in sizes from 1/2″ to 10″ with pressure ratings up to 1450 psi, it is offered in stainless steel and carbon steel body options.

Features & Benefits

• Infinitely adjustable in the built-in state — allows precise flow setting without removing the valve from the line
• Manual adjustment with integrated safety device — lockable position prevents unintended setting changes
• Defined characteristic curve — consistent, predictable flow behavior across the adjustment range
• End-position stops — mechanical limits protect the disc pair and prevent over-travel
• Space-saving wafer (intermediate flange) construction — installs between standard ANSI or DIN flanges with minimal footprint
• Very lightweight — simplified installation and reduced pipe loading compared to full-body valve designs
• Insensitive to cavitation — sliding gate disc geometry minimizes cavitation damage in liquid service
• Low packing leakage — stem sealing tested per TA-Luft 2021 and DIN EN ISO 15848-1
• Optional sealable configuration — external locking nut and locking plate available for tamper-resistant installations
• Stroke indicator included — visual position feedback at a glance

Technical Specifications

• Nominal sizes: 1/2″ – 10″
• Pressure ratings (DIN): 580 psi (PN40) for 1/2″–6″; 1450 psi (PN100) for 1/2″–4″; 235 psi for 8″–10″
• Pressure ratings (ANSI): Class 150 (1/2″–10″), Class 300 (1/2″–6″), Class 600 (1/2″–4″)
• Media temperature: -76°F to +662°F (body-material and rating dependent)
• Ambient temperature: -22°F to +284°F
• Body connection: Wafer type (self-aligning), flanges per ASME B16.5 RF or DIN EN 1092-1 Form B
• Actuation: Manual with adjusting nut and stroke indicator
• Body material (stainless steel): CF8M
• Body material (carbon steel): WCB
• Body cover: 316L stainless steel (both body options)
• Actuating stem: 316Ti stainless steel, roller burnished
• Fixed disc: 316Ti stainless steel (standard) or STN2-coated
• Sliding disc: Special carbon material (standard) or STN2
• Packing: PTFE (carbon-filled), spring-loaded — 301 stainless steel spring
• Leakage class (carbon/stainless disc pair): <0.0001% of Kvs — IEC 60534-4 Class IV-S1
• Leakage class (STN2 disc pair): <0.001% of Kvs — IEC 60534-4 Class IV
• Cv range: 4.6 (1/2″) to 1056 (10″) at 100% open — linear and equal-percentage characteristics available
• Flange gaskets (customer-supplied): ANSI B16.21 or DIN EN 1514-1 in applicable pressure rating
• Approvals: TA-Luft 2021 / ISO 15848-1; EU Declaration of Conformity; UKCA Declaration of Conformity

Applications

• Hydraulic balancing and commissioning of cooling and heating water systems
• Flow-setting on large engine cooling circuits in combined heat and power (CHP) plants
• Marine engine cooling system balancing
• Industrial process flow restriction and orifice applications
• Water treatment and circulation systems requiring precise, fixed flow rates
• Energy systems requiring tamper-resistant, lockable flow setting
• Chemical and petrochemical process lines where low leakage and TA-Luft compliance are required

Type 8090 Accessories

• Locking nut and locking plate – Optional sealable configuration to secure the valve position and prevent unauthorized adjustment
• Additional bellows seal (316Ti) – Secondary stem sealing for fugitive emission-critical applications
• Low-temperature packing kit – Stem sealing package rated down to -76°F for cryogenic or cold-service installations

Documentation