Isha90,
You need to think this through.
1. My comment was only a suggestion. A starting point for you to move on from.
2. You should not be leaning too much on information you get from a Forum like this.
3. You need to put together a Data Sheet of all the information for your situation (Design and Max Operation Temperature of the system, etc). Include every thing related to your installation. Include the basics of how you plan to maintain a fluid state in the lead during a short stoppage of the flow.
4. Send it to a bunch of Valve Manufacturing Companies
Sometimes its possible to do all the right things and still get bad results