I am working on a unidirectional pipe prover and i need to design and purchase the launching and receiving chamber. I am now facing some difficulties on the sphere handling valve, which should be something like an "hemispheric valve" which at first stops the ball and then release the ball  valve nd stops the fluid. Is there anybody who can give me some hints about this kind of valve.
Are we talking about something like a pig launcher/receiver or a sample testing unit, But a single valve?
Could you please expand on your idea? I do not believe this 'animal' exists, the first impresiion is that we would probably be talking about a bypass with a combination of pipe/valves assembly?
The valve i am speaking about is something like the one in the link. It is rather difficult to find it.I need a 16" 300# for crude oil.
Thank you for your time and attention.
Maybe a 3-way valve with welded in stop solve your problem. KTM was earlier years willing to offer modified valves. Perhaps other supplier, or standard valve modified by valve service workshops/suppliers.

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