What symbol is this? (P&ID) 2

[BamaGump]

Hi all, I was looking over a P&ID and am not familiar with the highlighted symbols below. Would anyone be able to help identify them? The horizontal line is headed towards a cartridge filter and the vertical branch is a bypass, if that context helps. I presume they must be some sort of valve, as there is nothing else shown on the line entering the cartridge filter.

 

[Gator]

Diaphragm valve

 

[shvet]

see std. PIP PIC001 appendix A3

https://files.engineering.com/getfi...6-9651-461a-b6e5-92b5035fc9d9&file=PIC001.pdf

 

[BamaGump]

Thank you Gator and shvet!