SOLIDWORKS Design & Help

if the liquid temperature coming out is not greater than the temperature the seal ring can withstand then yes, you can use a seal ring at the end

Yes, you will need some form of seal on the valve or it will leak. There are several different types of seals you can use, an o-ring or a wiper seal.

I am guessing this is a pressure regulating type of valve?

That is technically called a needle valve.

Looks good, just add some seals and you are good.

Puedes utilizar las siguientes guías de diseño de sellos:

Paginas en ingles:

https://www.applerubber.com/src/pdf/seal-design-guide.pdf

http://www.sealanddesign.com/page/o-ring-groove-design

https://www.aceseal.com/o-ring-materials

if this website forces me to write in English I force you to read in Spanish ;P