MKS 253B-23958 Exhaust Throttle Valve (N.C.) | Replacement, Equivalent & Selection Guide
The MKS 253B-23958 (Part No. 80046, Ref. 043926) is a Normally Closed (N.C.) exhaust throttle valve designed for precise flow control in vacuum and process gas systems. Operating pressure range: 0.39–0.59 MPa. Sourced and supplied by Konmask.com — your trusted industrial automation component partner.
Technical Specifications
- Manufacturer: MKS Instruments
- Part Number: 253B-23958
- Internal Reference: 80046 / 043926
- Type: Exhaust Throttle Valve — Normally Closed (N.C.)
- Series: 253B
- Operating Pressure: 0.39–0.59 MPa
- Valve Action: Pneumatically actuated, N.C. (fail-safe closed)
- Application: Exhaust flow throttling in vacuum process chambers
- Weight: ~20 g
- Origin: USA
Compatible Replacement & Equivalent Models
When the MKS 253B-23958 is unavailable or discontinued, the following models may serve as functional equivalents depending on your system configuration. Always verify port size, pressure rating, and actuation type before substitution.
- MKS 253B Series — Same series, verify pressure sub-spec
- MKS 248A / 248B — Throttle valve alternatives for similar vacuum ranges
- VAT Series 64 / 65 — Industry-standard exhaust throttle valves, compatible in many OEM setups
- Nor-Cal Products throttle valves — Compatible in ISO-KF and CF flange configurations
- SMC VHS / VHK Series — Pneumatic safety valves with N.C. action for comparable pressure ranges
Contact [email protected] for cross-reference verification before ordering a replacement.
Why Choose the Original MKS 253B-23958
- ✅ OEM-grade reliability — engineered to MKS Instruments’ precision standards
- ✅ Fail-safe N.C. design — closes automatically on loss of actuation signal, protecting process integrity
- ✅ Tight pressure control — optimized for 0.39–0.59 MPa operating window
- ✅ Drop-in compatibility — direct replacement for existing 253B-series installations
- ✅ Traceable sourcing — Konmask supplies verified, authentic components with documentation
Typical Applications
- Semiconductor CVD / PVD / Etch process chambers
- Vacuum pump exhaust throttling and pressure regulation
- Flat panel display (FPD) manufacturing equipment
- Solar cell deposition systems
- Industrial vacuum furnaces and coating lines
- Gas abatement and exhaust management systems
System Compatibility
The MKS 253B-23958 is commonly found in systems manufactured by Applied Materials, Lam Research, Tokyo Electron (TEL), Novellus, and other OEMs that integrate MKS Instruments vacuum control components. Verify your system’s valve interface (port size, flange standard, actuation voltage) before ordering.
Selection Guide
Use the table below to identify the right valve for your application:
- Operating pressure < 0.39 MPa → Consider MKS 248A or VAT Series 64 (lower range)
- Operating pressure 0.39–0.59 MPa → MKS 253B-23958 ✓ (this model)
- Operating pressure > 0.59 MPa → Consult MKS 253C series or equivalent high-pressure throttle valves
- Normally Open (N.O.) required → Specify N.O. variant when ordering; 253B-23958 is N.C. only
- Manual override needed → Confirm actuator sub-model supports manual override option
Not sure which model fits your system? Send your equipment model number to [email protected] for a free selection consultation.
Quality Assurance & Sourcing
- All components sourced through verified industrial supply channels
- Pre-shipment inspection available on request
- Traceability documentation (COC / datasheet) provided where available
- Konmask specializes in hard-to-find and obsolete automation components
How to Order
- Confirm part number: MKS 253B-23958 (80046 / 043926)
- Specify required quantity
- Contact us for lead time and pricing: [email protected] | +0086 19859288691
- Or place your order directly on Konmask.com
Replacement & Compatibility FAQ
Q: Is the MKS 253B-23958 still in production?
A: Availability varies. Konmask maintains stock of both current and legacy MKS components. Contact us to confirm current stock status.
Q: Can I use a VAT throttle valve as a direct replacement?
A: VAT valves may be functionally compatible but require verification of port dimensions, flange standard, and actuation interface. We recommend consulting our team before substitution.
Q: What does N.C. mean for this valve?
A: Normally Closed (N.C.) means the valve defaults to the closed position when no actuation signal is present — a fail-safe design critical for vacuum process safety.
Q: Do you supply the full MKS 253B series?
A: Yes. Konmask stocks and sources multiple variants across the MKS 253B series. Contact us with your specific part number for availability.
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Contact: [email protected] | +0086 19859288691
