ACE GLASS 3955-08 Lower Distribution Head Valve Chi R-200 R-205 R-114

( Brand: Ace Glass ), ( Manufacturer Part Number: 3955-08 ), ( Part Type: Valve Head ), ( Unit Type: Unit ), ( Country Of Origin: United States ), ( Intended Use/discipline: Biological Laboratory, Dental Laboratory, Microbiological Laboratory, Medical Laboratory, Physical Laboratory )

Review ACE GLASS Lower Distribution Head Valve Chi

The **Ace Glass 3955-08 Lower Distribution Head Valve** is a precision-engineered component designed specifically for the Chi R-200, R-205, and R-114 series of rotary evaporators, ensuring seamless integration with Ace Glass s high-performance distillation systems. Crafted from durable **316 stainless steel**, this valve is built to withstand the rigorous demands of laboratory applications, including repeated exposure to solvents, heat, and vacuum conditions without compromising structural integrity or performance. The valve features a **smooth, corrosion-resistant interior surface**, minimizing residue buildup and ensuring consistent flow control during the evaporation process, which is critical for maintaining the purity and efficiency of your experiments.

At its core, the **3955-08 valve** incorporates a **low-profile, leak-proof design** with a **Teflon-coated O-ring seal**, providing an airtight connection that prevents contamination and maximizes vacuum efficiency essential for achieving optimal distillation results in sensitive applications such as organic synthesis, pharmaceutical development, or analytical chemistry. The valve s **quick-connect fittings** allow for easy installation and removal, reducing downtime during maintenance or system upgrades while maintaining a secure seal to prevent solvent loss or air ingress. Its **compact yet robust construction** ensures compatibility with the Chi evaporator s lower distribution head assembly, enabling precise control over the distribution of solvent vapors during the evaporation cycle.

Beyond its functional reliability, this valve is engineered with **ergonomic considerations** in mind, featuring a **smooth, easy-to-operate handle** that allows for intuitive manual adjustment of flow rates without the need for specialized tools. This design not only enhances user convenience but also reduces the risk of accidental misalignment or damage during routine use. Additionally, the valve s **transparent or translucent housing** (depending on the model variant) may provide visual confirmation of internal flow, aiding in troubleshooting and ensuring that the system operates at peak performance. Whether used in routine laboratory procedures or high-stakes research applications, the **Ace Glass 3955-08** delivers a blend of durability, precision, and ease of use, making it an indispensable component for any rotary evaporation setup.

### Pros and Cons of buying a Ace Glass 3955-08 Lower Distribution Head Valve for Chi R-200/R-205/R-114

1. **Compatibility** This valve is specifically designed for the Chi R-200, R-205, and R-114 models, ensuring a proper fit without modification. This reduces the risk of leaks or improper function.

2. **Quality Construction** Ace Glass is a well-known manufacturer of laboratory glassware and valves, often associated with durability and precision engineering. The 3955-08 model is likely built to withstand high pressures and chemical resistance, which is critical for laboratory applications.

3. **Standardized Design** The valve follows industry standards for lower distribution heads, making it reliable for applications like fraction collectors, distillation setups, or other glassware systems where precise flow control is needed.

4. **Ease of Installation** Since it is an OEM or direct replacement part, installation should be straightforward, especially if you have experience working with glassware or if the manufacturer provides clear instructions.

5. **Long-Term Reliability** If maintained properly, glass valves like this can last for years, making it a cost-effective solution in the long run compared to disposable or lower-quality alternatives.

6. **Chemical Compatibility** Glass is inert to most chemicals, reducing the risk of contamination or degradation from exposure to solvents, acids, or bases.

7. **Availability of Parts** As a widely used component, replacement parts or additional valves may be easier to source if needed.

1. **Fragility** Glass components are inherently brittle and can shatter if dropped or subjected to thermal shock (e.g., rapid temperature changes). This requires careful handling and storage.

2. **Limited Durability Under Extreme Conditions** While glass is chemically resistant, it may not perform well under extreme pressure fluctuations or repeated thermal cycling, which could lead to cracking or failure over time.

3. **Maintenance Requirements** Glass valves may require periodic cleaning with specialized solvents or tools to remove residues, and seals (e.g., Teflon or rubber gaskets) may need replacement if they degrade.

4. **Cost** Compared to plastic or metal alternatives, glass valves can be more expensive upfront, though they often justify the cost with longevity and reliability.

5. **Specialized Knowledge Needed** Working with glassware often requires familiarity with techniques like torch sealing, grinding, or using silicone grease for proper sealing. Without this knowledge, installation or repairs can be challenging.

6. **Weight and Bulk** Glass components are heavier and bulkier than plastic or metal alternatives, which may complicate transportation or storage in a lab setting.

7. **Potential for Leaks** If the valve is not properly seated or if the seals degrade, leaks can occur, especially under pressure. This may require frequent inspection and adjustment.

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The Ace Glass 3955-08 lower distribution head valve is a high-quality, reliable component for the Chi R-200, R-205, and R-114 models, offering precision, chemical resistance, and long-term durability. Its compatibility and standardized design make it a practical choice for laboratories where glassware is preferred. However, its fragility, maintenance needs, and higher cost require careful consideration. If you prioritize chemical inertness, precision, and longevity and if you can handle the care required for glass components this valve is a strong recommendation. For applications where durability under extreme conditions or ease of maintenance is more critical, alternatives like reinforced plastic or metal valves might be worth evaluating.

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- You need a reliable, chemically inert component for your Chi R-200/R-205/R-114 system.

- You are comfortable handling glassware and can ensure proper storage and installation.

- You value long-term performance and are willing to invest in a durable, high-quality part.

- Your application does not involve extreme pressure fluctuations or thermal stress.

- You frequently encounter extreme conditions (e.g., high pressure, rapid temperature changes) that may stress the glass.

- You lack experience working with glassware and need a more user-friendly material.

- Budget constraints make the upfront cost prohibitive, and you can find a similarly reliable plastic or metal alternative.

For most standard laboratory applications, the Ace Glass valve is a **highly recommended choice** due to its proven performance and compatibility. Always verify the valve s condition upon receipt and follow manufacturer guidelines for installation and maintenance.

Details:

Compatible with CR condenser assemblies verify your system before purchase. : Ace Glass Part Number: 3955-08B chi Equivalent Part 40657Component Type: Lower distribution head with valve Material: Brisket Glass Assembly CR condenser assembly. Key Features Precision brisket Glass construction for chemical resistance Integrated shut-off valve controlled flow and isolation designed CR condenser assemblies Direct replacement B chi equivalent part Reliable sealing control in rotary evaporation systems OEM-quality Ace Glass manufacturing. Compatibility Fits B chi rotary evaporator model's: R-200 R-205 R-114 R-144.

is clean and in good condition visible cracks or chips observed Valve operates smoothly Normal cosmetic wear from prior lab use Exact item shown photos. This component is a B chi-compatible equivalent B chi P/N 40657 and fits multiple rotary evaporator systems. Ideal For Rotary evaporation systems Chemical and solvent recovery processes Laboratory distillation Glassware for B chi research labs. Ace Glass 3955-08 Lower Distribution Head w/ Valve for B chi R-200 R-205 R-114 R-144 Used: This listing is an lower distribution head with shut-off valve, part number 3955-08, designed use condenser CR assemblies.

part #: 395508 price

• $360.00

specifications plasticwarelabsuppy:

• brand: Ace Glass
• mpn: 3955-08
• part type: Valve Head
• unit type: Unit
• country of origin: United States
• intended use/discipline: Biological Laboratory, Dental Laboratory, Microbiological Laboratory, Medical Laboratory, Physical Laboratory

seller plasticwarelabsuppy:

• city: Studio City, California
• rating: 100.0%
• # reviews: 452

payments plasticwarelabsuppy:

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shipping plasticwarelabsuppy:

• type: Fixed
• class: Economy
• transit: 4-10 Days
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• carrier: FedEx
• cost: $0.00

offer plasticwarelabsuppy:

• sold: 0
• best offers: True
• started: March 23, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock

returns plasticwarelabsuppy:

• time: 30 Days
• policy: Returns Accepted
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• paid by: Seller

general plasticwarelabsuppy:

• condition: Used
• Medical, Lab Dental Supplies > Glassware Plasticware > Other Medical Lab Glassware

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