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Hi Erkamal, When we say NACE, we normally mean the valve body and trim. Tugsten is coating on the ball and seat. And Tugsten is higher than NACE standards. So as long as the valve body and trim material is NACE standard, the valve is in NACE application. Regards

there are a lot of things to learn... Good luck.

Littleinch's reply is very good. It is very easy to do an extended stem gate valve. His option is correct and easy to carry out. By the way, since the valve is underground, I'm afraid only epoxy coated is not enough. There are a few specific painting for underground valves. So, please put some...

I think littleinch's reply is very good. The extended stem is so common. This will be a cheap and good way.

This problem is easy to sort out. From my view, 1. you ask the torque from the manufacturer. They will give you easily. 2. you give the torque and wrench length information to your end user and let them decide whether they are acceptable. 3. If yes, use wrench. If no, use gear box. Of coz...

It shouldn't be a BIG problem. Because the onsite install can be adjusted by pipeline. But...yes, it depends how your end user regards this problem.

Normally, we say DI (Ductile Iron) only. And there are some manufacturers can supply Ductile Iron globe valve in China. They normally do OEM orders for Japan. If you need any further information, you are welcome to contact me.