How Do I Choose a Reliable PVC Pipe Machinery Manufacturer in India?

I’m researching PVC pipe manufacturing machinery and would like to understand what buyers should evaluate before choosing a manufacturer in India. Besides the initial machine price, which factors matter most—production capacity, build quality, automation level, power consumption, maintenance requirements, spare-parts availability, customization, or after-sales support? I’d also like to know which technical specifications should be compared when evaluating different machines and how buyers can determine whether a machine is suitable for their expected production requirements.