Which domestic brand of vacuum pump offers the best cost-performance ratio?

What’s the capacity? For Huas with a low gas volume of 100~50 Pa, use a Roots + screw pump!

Foshan Water Pump Factory – quite impressive

This vacuum system needs to be addressed from two aspects. First, the ultimate vacuum level achievable with the pump combination should be between 5 and 10 Pa; domestic rotary vane pumps aren’t good enough for this purpose. It is recommended to use a rotary vane pump in combination with another type of pump, such as a screw pump, and it’s better to opt for foreign-made pumps. Second, during system installation, ensuring the system’s airtightness is crucial. It is advisable to use vacuum ball valves for valves and other components, as they are more suitable for this purpose. If possible, use connection fittings specifically designed for vacuum systems as well

Both Yester pumps and Nash pumps are manufactured in Zibo. The difference is that Yester uses corrosion- and wear-resistant composite materials, while Nash uses metal materials; as a result, Yester pumps do not suffer from losses in mechanical precision due to wear and corrosion over time. The geometric dimensions of the components of these two types of pumps are exactly the same, allowing them to be used interchangeably. However, the price of Yester pumps is much lower than that of Nash pumps. Nash pumps come with a one-year warranty, while Yester pumps have a one-and-a-half-year warranty.

All the pumps and vacuum pumps in our company are from NASH; currently, due to the operating conditions, the vacuum level is often close to the limit, above 98. So the pump’s rotor assembly and disk, among other components, suffer from severe cavitation over a period of about 1.5 years. The rotors are made of cast iron; two of them have been replaced with stainless steel, but the results were not very satisfactory. I haven’t been in contact with the East person you mentioned. It’s not right for the company to keep replacing parts in this manner; we currently have 13 NASH pumps, and having to replace parts on a yearly basis like this is not acceptable. The company is currently carrying out gradual technical upgrades, having added 2 claw pumps. Could you please provide the contact information as well? You said that the pumps from the two companies are of the same size, but I’m not sure whether the rotors, disks and other components can be exchanged between them How much is the price difference between the two?

Can the after-sales service abroad keep up? And then, are there any good foreign brands?

For liquid ring pumps, operating near the limit – none of them can do it, as cavitation will occur in all cases! A pre-pump must be added!

Now, many foreign-brand dry pumps have assembly plants in China, so there are basically no issues with after-sales service. The use and maintenance of vacuum pumps actually depend on the quality of the initial process design; all possible problems need to be taken into account. Moreover, when calculating vacuum systems, it’s necessary to allow for a fairly wide range of errors – sticking strictly to the calculated values can lead to serious problems with the vacuum pump, regardless of its quality. As for brands, for dry pumps, imported Edwards models offer good value for money. If you can afford it, Sihi is also a good choice. Other brands such as Leybold, Pfeiffer, Teschler, and ULVAC are also excellent, each with its own strengths – you can decide based on your own needs

If you’re looking for good value for money, I recommend that you consult me. Haha, the water ring pumps produced by Yantai Wolm can compete with those from Siemens, and their dry screw vacuum pumps are designed to replace brands from Europe and the United States such as Puxi and Tesco. There’s no need to overly rely on foreign brands; there are many domestic manufacturers that possess their own advanced technologies. In the vacuum pump industry, Wolm is renowned for its excellent value for money. I truly hope that domestic users can make use of high-quality Chinese-made products at affordable prices. As the saying goes, it’s better to see it in person; feel free to visit our company if you’re interested.