Start with your process.

Pipeline isolation and non-return service. Define pressure, temperature, medium and sealing requirements.

Review corrosion compatibility, seat and packing materials, and any emission-control requirements.

Specify steam or water duty, operating conditions, trim materials and the required pressure class.

Discuss shutoff and backflow duties, water composition, installation space and actuation needs.

Describe solids content, abrasion, flow conditions and maintenance needs for application review.

Identify whether the duty involves direct product contact or utilities; specify cleaning and material requirements.