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Quality Control

Quality cannot be sacrificed by any means.

All Hy-Lok valves, Hy-Lok tube fittings, Hy-Lok threaded and clean fittings and Bite type fittings are manufactured under our strict Quality Control Program. We have obtained ISO 9001 Certificate and Quality System Certificate from ASME. We also have certificates from Det Norske Veritas (DNV) and Germanischer Lloyd (GL). Furthermore, we are one of a few valve and fitting manufacturers in the world holding the Nuclear Certificates as material manufacturer and supplier. These certificates cannot be obtained overnight. They are the results of our extensive and continuing efforts for quality control, covering virtually all our activities ; product design, material procurement, manufacturing, cleaning and packaging, inspection, testing, and after-sales services.

Raw Material Management

The base materials are one of the key factors determining the quality of valves and fittings which manufacturing processes involves forging, fine machining, heat treatment, etc. Using poor quality base materials can affect the quality, reliability, and service life of the products. Hy-Lok products are made from the highest quality materials obtained from the most reliable suppliers around the world Material Certificates are readily available upon request from us or from the base material suppliers. Our efficient, stock of raw materials enables a short delivery.

Quality Control

HCT (Heat Code Tracability)

Hy-Lok has implemented a Heat Code Tracability system. Our HCT is unique because it not only contains the raw material information, but also more detailed process and technical information, if necessary, each product can be traced back for the verification of materials, processes, etc.

Pressure Test

Our valves are 100% factory tested with nitrogen normally at 1000 psig to the max leak rate of 0.1 SCC/M Upon client''s specific request, valves or fittings can be tested under severe conditions; e.g. at higher pressure, and/or at elevated or very low temperatures, with vibrations, etc.

Close Dimensional Control

At Hy-lok, all dimensions are closely checked and controlled by each operator according to our special in-process-quality-control procedures separate form the QC inspection. This is done accurately with inspection gauges which are specifically designed and periodically calibrated. Each operator knows whether the process is in exact control or not. Defects or problems, if any, are detected and corrected on the spot immediately. By doing so, we have achieved the following.

-Dimensional Tolerance of 1/1000 inch
-Threads tolerance acc 2A, 2B, as per ASME B1.1

In addition, we have minimized the failure rate and downtime and maximized pass rate and productivity, which in turn has made our products most competitive in price.

In order to keep gas or liquids clean, the inner surface of the fittings must be smooth. The inner surface of the fittings must be smooth. The inner surface of each Hy-Lok Valves and fittings is fine machined and tested with special instruments.

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