Q. Are there any special requirements for OEM purchases?
A. Yes. Liangchuan requires proof of trademark registration in order to print or emboss your trademark onto the product or packaging.

Q. Do Liangchuan products come with a warranty ?
A. Yes. That's why we offer 3-year product life guarantee, and a generous1 year warranty on all purchases that begins with the bill of loading.

Q. How can I get some samples?

A. Usually we don’t offer free sample and express fee are required, the sample cost can be deducted from your first large order.

Q. What's the MOQ of your products?

A. Our MOQ is one (1) piece/set.

Q. Are you a manufacturer with your own factory?

A. Yes, we are the manufacturer for more than 8 years

Advantage Of our company

1. Excellent technology:

the technology is in the leading level in China, cooperate with the most famous

universities in China;

2. Advanced equipment:

advanced processing equipment and testing means, providing the integration of automation system solutions for product, engineering, service and training.

3. Strong team:

have many senior engineers with plenty of research, development, design

experience, providing professional service for sales and after sales.

4. Good quality:

reliable and stable quality, good performance, long life time.

5. Full series of products:

covers full category of valves, meet the general standard of every country in the world, such as GB, DIN, ASTM, BS, JIS.

6. Professional after sales service:

have the professional engineer team to provide the service.

7. Certificates:

passed the ISO9001 certificate as well as CE,ISOetc.

8. Fast delivery time:

have the stock, fast delivery time could be guarantee.

9. Packing:

packing strictly as per the exporting standard or as per the customized request.

10. Long-term quality warranty time:

provide 12 months quality warranty time.

In the design of cryogenic valves, on the one hand, the structural design ensures that the packing is close to the ambient temperature. For example, the long-neck bonnet structure is adopted to keep the stuffing box as far away from the cryogenic medium as possible. On the other hand, consideration should be given to the selection of packing Low temperature characteristics of the filler. Asbestos filler impregnated with PTFE is generally used in cryogenic valves. Flexible graphite is a newly developed excellent sealing material. Cryogenic valves can also be sealed with bellows without packing, usually multi-layer bellows. Gaskets for cryogenic valves must have reliable sealing and restorability at room temperature, low temperature and temperature changes. As the gasket material will harden and reduce plasticity at low temperatures, a gasket material with small performance changes should be selected. When the operating temperature is -200℃ and the maximum operating pressure at low temperature is 3MPa, asbestos rubber sheet made of long-fiber white asbestos is used. When the service temperature is -200℃ and the maximum working pressure is 5MPa, the spiral wound gasket made of acid-resistant steel tape and asbestos, or the spiral wound gasket made of polytetrafluoroethylene and acid-resistant steel tape. Spiral wound gaskets made of flexible graphite and acid-resistant steel are ideal for low-temperature valves at -200℃.