YTI inventory image. Contact YTI to confirm the exact physical unit, flange configuration, heaters, condition and included hardware before purchase or rental.
Varian · High-Vacuum Equipment
Varian HS-35 Diffusion Pump
Model: HS-35 · Equipment: Diffusion Pump
Large industrial Varian HS-35 diffusion pump available from YTI for $25,000. One unit is immediately available, with additional inventory expected, plus rental and refurbishment support for high-vacuum production systems.
YTI Purchase Price
Purchase price for one Varian HS-35 diffusion pump. Final physical configuration, equipment condition and freight are confirmed before sale.
Rental pricing available by quoteIn Stock
- 1 Varian HS-35 immediately available
- 3 additional units available within approximately 2 weeks
- YTI purchase price: $25,000 each
- Available for purchase or rental
What do you need? Choose the equipment path that matches your project.
Product Description
Varian HS-35 high-vacuum diffusion pump
The Varian HS-35 is a large industrial oil diffusion pump designed for applications that require substantial high-vacuum pumping capacity and dependable operation in production environments.
Pumps in the HS-35 family have been used in vacuum coating, metallizing, optical coating, vacuum furnaces, heat treatment, thin-film processing and other industrial vacuum systems where high gas throughput and large chamber volumes are common.
YTI currently has one HS-35 immediately available for purchase at $25,000, with three additional pumps expected within approximately two weeks. Rental pricing can also be requested for qualifying applications.
Because HS-35 pumps may have been produced in different configurations or modified during years of industrial use, YTI confirms the actual flange arrangement, heaters, electrical configuration, cooling, internal condition and included hardware before the physical pump is released for installation.
YTI also supports customer-owned HS-35 pumps through complete refurbishment. That service can include teardown, cleaning, jet-stack inspection, heater evaluation, resealing, fresh application-correct pump fluid, helium leak testing and performance verification before return to service.
HS-35 Factory-Reference Specifications
| Manufacturer | Varian / Agilent |
|---|---|
| Model Family | HS-35 / NHS-35 |
| Equipment Type | Oil Diffusion Pump |
| Air Pumping Speed | 28,000 L/s |
| Helium / Hydrogen Speed | 35,000 L/s |
| Operating Range | 9 × 10⁻⁴ to <5 × 10⁻⁸ Torr |
| Maximum Throughput | 25 Torr-L/s |
| Maximum Forepressure — Full Load | 0.40 Torr |
| Maximum Forepressure — No Load | 0.55 Torr |
| Recommended Backing Pump | ≥300 CFM / 510 m³/hr |
| Fluid Charge | 3 U.S. gal. / 11.3 L |
| Electrical | 3 phase · 50/60 Hz |
| Common Factory Voltages | 240 / 415 / 480 VAC |
| Pump Power | 24,000 W |
| Cooling Water | 4 GPM at approximately 60–80°F |
| Factory Fluid Reference | DC-704 |
| Inlet Flange | 35 in. ASA or ISO 1000F |
| Foreline | 6 in. ASA or ISO 200K |
| Factory Pump Weight | Approx. 1,500 lb / 680 kg |
| YTI Purchase Price | $25,000 each |
| Current YTI Availability | 1 now · 3 additional approximately 2 weeks |
| Rental | Available by quote |
These are factory-reference specifications for the HS-35 / NHS-35 family. The exact YTI inventory unit may differ by production year, flange arrangement, heaters, electrical configuration, modifications or prior refurbishment. Confirm the physical equipment with YTI before installation or system design.
Before You Purchase
Confirm the HS-35 matches the complete vacuum system
01 · INLET
Verify the chamber connection
Confirm inlet flange style, bolt pattern, chamber interface and physical installation dimensions before choosing a replacement pump.
02 · ELECTRICAL
Confirm heater power
Verify facility voltage, heater configuration, controls and safety interlocks before connecting the HS-35.
03 · COOLING
Check water capacity
Large diffusion pumps depend on stable cooling-water flow through the pump body and associated baffle or cold-cap hardware.
04 · BACKING
Size the backing pump
The mechanical backing stage must maintain acceptable forepressure and handle the chamber’s actual process gas load.
05 · BAFFLE / TRAP
Review vapor control
Baffles, cold caps and traps affect backstreaming, conductance, contamination control and pumping performance at the chamber.
06 · CONDITION
Confirm refurbishment scope
YTI can inspect the body, internal jet assembly, heaters, seals, cooling system and pump fluid before return to service.
Equipment Options
Purchase, rent or refurbish a Varian HS-35
Current Inventory
Purchase an HS-35
YTI’s purchase price is $25,000 per HS-35. One unit is currently available with three additional units expected. Final configuration and freight are confirmed before sale.
Request this $25,000 pump →Temporary Equipment
Rent an HS-35
Rental pricing is available by quote when production needs to continue while another pump is being repaired, rebuilt or prepared for replacement.
Request rental pricing →Existing Equipment
Refurbish your HS-35
YTI provides complete diffusion-pump refurbishment including teardown, cleaning, internal inspection, heater verification, resealing, pump fluid, leak testing and performance verification.
View refurbishment service →Technical Support
More Varian and diffusion-pump support from YTI
Product FAQs
Varian HS-35 diffusion pump questions
How much is a Varian HS-35 diffusion pump from YTI?
YTI’s purchase price for the Varian HS-35 diffusion pump is $25,000 per unit. Freight and the exact physical configuration are confirmed before sale.
Does YTI currently have a Varian HS-35 diffusion pump available?
Yes. YTI currently has one Varian HS-35 immediately available for $25,000, with three additional units expected within approximately two weeks.
Is the Varian HS-35 available for sale or rental?
Yes. The purchase price is $25,000 per pump. Rental pricing is available separately by quote and depends on timing, equipment availability and application.
What is the pumping speed of a Varian HS-35?
Factory specifications for the NHS-35 / HS-35 family list an air pumping speed of approximately 28,000 liters per second and approximately 35,000 liters per second for helium and hydrogen. Installed performance depends on the complete vacuum system.
How much electrical power does an HS-35 require?
Factory specifications list approximately 24 kW of pump power with three-phase electrical service. Common factory configurations include 240, 415 and 480 VAC. YTI should verify the exact heater configuration before installation.
How much cooling water does an HS-35 require?
Factory-reference specifications list approximately 4 gallons per minute of cooling-water flow at approximately 60–80°F. Connected baffles, traps and other equipment may have additional cooling requirements.
What backing pump is recommended for a Varian HS-35?
Factory specifications recommend at least approximately 300 CFM of backing capacity. Actual requirements depend on the process, chamber volume, gas load and foreline design.
What diffusion pump fluid does the HS-35 use?
Factory literature references DC-704 and an approximately three-gallon fluid charge for the NHS-35 family. YTI should confirm the appropriate fluid for the physical pump and intended process before service.
Can YTI rebuild an existing Varian HS-35?
Yes. Diffusion-pump refurbishment is a core YTI service. The rebuild process can include teardown, cleaning, jet-stack inspection, boiler and heater verification, new seals and gaskets, fresh pump fluid, helium leak testing and performance verification.
How do I know whether the HS-35 will fit my system?
Send YTI the existing pump model, nameplate photos, chamber connection, flange dimensions, electrical information, cooling requirements, backing-pump model, process application and photos of the installation. YTI can review compatibility before purchase.
Customer Reviews
Varian HS-35 customer reviews
Feedback from customers who purchased a Varian HS-35 diffusion pump through Yeagle Technology / YTI.
Customer Review
The HS-35 arrived clean, well packaged, and ready for installation. The pump was in excellent condition and performed as expected once installed on our vacuum system. YTI was also very helpful with compatibility questions before the order.
Customer Review
We needed a replacement HS-35 for an older coating system and Yeagle Technology made the process straightforward. The pump was properly prepared, shipped securely, and has been running reliably since installation.
Customer Review
Very pleased with the condition of the Varian HS-35 we received. Everything was clean and professionally handled, and the YTI team was knowledgeable about the equipment and our application.
Customer Review
Our existing diffusion pump was becoming unreliable, so we contacted YTI about an HS-35 replacement. They helped us verify what we needed and got us a solid unit without unnecessary downtime.
Customer Review
The pump showed up in excellent condition and was packaged extremely well for freight shipment. Installation went smoothly and vacuum performance has been consistent. Good experience working with Yeagle Technology.
Customer Review
YTI was easy to work with and knew the Varian equipment well. They answered our technical questions quickly and helped make sure the HS-35 was appropriate for our system before we moved forward.
Customer Review
We purchased the HS-35 for an older vacuum coating system where finding dependable replacement equipment can be difficult. The unit has performed well and YTI made sourcing the pump much easier.
Customer Review
Good communication, knowledgeable support, and a quality pump. The HS-35 was delivered in the condition described and has been operating reliably in our production equipment.
Varian HS-35 · $25,000
YTI currently has one HS-35 immediately available with additional inventory expected. Purchase for $25,000, ask about rental pricing, or request refurbishment support.
