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  3. MKS 1009900SSS

MKS 1009900SSS Angle Isolation Valve

1009900sss Mks Angle Isolation Valve Used Working

( Brand: Mks ), ( Manufacturer Part Number: 1009900SSS ), ( Part Type: Angle Valve ), ( Valve Operation: Angle Isolation Valve ), ( Country Of Origin: United States )

Review MKS Angle Isolation Valve Used Working

The **MKS 1009900SSS Angle Isolation Valve** is a high-performance, stainless steel precision valve engineered for demanding applications in vacuum systems, semiconductor manufacturing, and scientific research environments where reliability, leak integrity, and durability are paramount. Designed with a compact yet robust **90-degree angle configuration**, this valve features a **316L stainless steel body and wetted parts**, ensuring exceptional resistance to corrosion, chemical exposure, and thermal cycling, making it ideal for use in aggressive or corrosive atmospheres. The valve operates on a **pneumatic or manual actuation system**, providing precise control over gas flow with minimal dead volume, which is critical for maintaining ultra-high vacuum (UHV) conditions or ensuring accurate process gas delivery in plasma etching, deposition, or thin-film coating systems. Its **conical seal design** guarantees a hermetic seal when closed, preventing backstreaming and cross-contamination, while the **low-outgassing materials** and **bakeable construction** (up to 450 C) allow for thorough system outgassing and high-temperature processing without compromising performance. The **flanged connections** (typically CF or ISO-KF, depending on the configuration) ensure a secure, leak-tight interface with minimal conductance loss, and the valve s **quick-connect or permanent mounting options** provide flexibility for integration into existing vacuum systems. Whether used in research laboratories, semiconductor fabrication plants, or specialized industrial processes, the MKS 1009900SSS delivers uncompromising precision, longevity, and operational efficiency, making it a trusted component for maintaining the integrity of vacuum environments where even the slightest deviation could impact critical experimental or manufacturing outcomes.

### Pros and Cons of buying a MKS 1009900SSS Angle Isolation Valve

#### **Pros:**

1. **High-Quality Construction** The valve is made from **316L stainless steel**, which is corrosion-resistant and suitable for demanding applications, including vacuum systems, semiconductor manufacturing, and chemical processing. This material ensures longevity and reliability in harsh environments.

2. **Precision Engineering** Designed for **ultra-high vacuum (UHV) and high-vacuum (HV) applications**, the valve provides tight sealing and minimal outgassing, which is critical for sensitive processes like thin-film deposition or particle physics experiments.

3. **Compact and Space-Efficient Design** The **angle configuration** allows for flexible piping layouts, reducing the need for excessive piping runs and saving valuable space in tight installations.

4. **Manual Operation with Optional Actuation** While primarily manual, it can be integrated with **pneumatic or electric actuators** (sold separately) for automated control, improving workflow efficiency in automated systems.

5. **Compatibility with MKS Systems** As part of the MKS Instruments ecosystem, it integrates seamlessly with other MKS components, such as vacuum pumps, gauges, and controllers, ensuring system-wide compatibility.

6. **Low Outgassing** The valve is designed to minimize contamination in vacuum systems, which is essential for maintaining clean environments in research and manufacturing.

7. **Durability** The robust construction and high-quality materials make it suitable for **long-term use** in industrial and laboratory settings without frequent replacements.

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#### **Cons:**

1. **High Initial Cost** MKS products are premium, and this valve is no exception. The price point may be prohibitive for small labs, startups, or budget-conscious projects.

2. **Specialized Application** While versatile, it is optimized for **vacuum systems** and may not be practical for general fluid or gas control applications outside of high-vacuum environments.

3. **Maintenance Requirements** Like all precision valves, it requires **proper handling and occasional maintenance** (e.g., lubrication of seals, checking for leaks) to ensure optimal performance. Improper use can lead to premature wear.

4. **Dependence on MKS Ecosystem** If you are not already using MKS components, you may need to invest in additional hardware (e.g., controllers, pumps) to fully utilize this valve, increasing overall system costs.

5. **Limited Manual Operation Convenience** The manual operation can be cumbersome for frequent adjustments, especially in large systems. While actuators can be added, this adds to the complexity and cost.

6. **Potential for Leaks Over Time** Even high-quality valves can develop leaks if seals degrade or if the system is subjected to extreme temperature fluctuations or pressure cycles. Regular inspections are necessary.

7. **Training and Expertise Required** Proper installation, calibration, and troubleshooting may require **technical expertise**, particularly in vacuum system design. Inexperienced users might struggle with setup or maintenance.

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### **Conclusion:**

The **MKS 1009900SSS Angle Isolation Valve** is an excellent choice for **high-vacuum applications** where reliability, precision, and corrosion resistance are critical. Its stainless steel construction, compact design, and compatibility with MKS systems make it ideal for **semiconductor manufacturing, research labs, and industrial vacuum processes**. However, its **high cost, specialized nature, and maintenance demands** may not justify its purchase for general-purpose or low-budget applications.

If your project involves **ultra-high vacuum, semiconductor fabrication, or particle accelerator systems**, this valve is a strong recommendation due to its performance and durability. For **non-vacuum applications or cost-sensitive projects**, exploring alternative valves (e.g., standard stainless steel ball valves or cheaper manual isolation valves) may be more practical.

### **Recommendation:** - **Buy it if:**

- You are working in a **vacuum-sensitive environment** (UHV/HV systems).

- You are already using **MKS components** and need seamless integration.

- Budget constraints are not a major concern, and long-term reliability is prioritized.

- Your application requires **compact, corrosion-resistant isolation** with minimal outgassing.

- **Avoid it if:**

- You need a **general-purpose valve** for non-vacuum applications.

- Your budget is limited, and you can find equally effective (but cheaper) alternatives.

- You lack the expertise to properly install, maintain, or troubleshoot vacuum systems.

- Your system does not require the precision or sealing performance of an MKS valve.

For most **high-end vacuum applications**, this valve is a worthwhile investment. For other uses, consider whether the premium features align with your specific needs.

Details:

Also, buyer has the option to use their own shipping account. Sale Details. Only items pictured are included - If a part is not pictured, or mentioned above, then it in the sale. Otherwise, the physical condition of valve is good and clean.

Model #: 1009900SS. Condition: Used working, 90-day warranty. MKS 1009900SSS Angle Isolation Valve used working: Inventory# 1000-593. Return/Warranty.

This MKS 1009900SSS Angle Isolation Valve, is used working surplus. Specifications. It shows signs of use and handling, such as, minor scuffing scratching to the exterior. Pictured test equipment is not included or available for sale.

part #: 1009900sss price

  • $500.00

specifications valvesplumbing:

  • brand: Mks
  • mpn: 1009900sss
  • part type: Angle Valve
  • valve operation: Angle Isolation Valve
  • country of origin: United States

offer valvesplumbing:

  • best offers: True
  • started: June 9, 2026
  • sold: 0
  • options: Ship-to-home
  • quantity: 1
  • availability: In Stock

general valvesplumbing:

  • condition: Used
  • Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Other Valves Manifolds

shipping valvesplumbing:

  • class: Economy
  • type: Fixed
  • cost: $0.00
  • service: FedEx Ground Economy
  • transit: 7-14 Days
  • carrier: FedEx

returns valvesplumbing:

  • paid by: Seller
  • time: 60 Days
  • method: Money back
  • policy: Returns Accepted

payments valvesplumbing:

  • wallet: Apple-pay
  • other
  • credit card: Diners-club

seller valvesplumbing:

  • city: Hollister, California
  • rating: 100.0%
  • # reviews: 818
part type: angle valve, valve operation: angle isolation valve, country of origin: united states,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > valves manifolds, sku: 25028983265094881,
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1 offer $500.00 USD
  • Used. Offer #1 priced at $500.00 + $0.00 shipping estimate = $500.00* total. Otherwise, the physical condition of the valve is good and clean. This MKS Angle Isolation Valve, is used working surplus.FREE SHIPPING

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