SH01, spring return handle (also called deadman handle) is well designed as heavy duty type for very long term operation.
The most characteristic type of SH01 is the one with the optional locking device.
The SH01 is designed to mount upon the ISO 5211 direct mounting pad. This is very convenient for users to replace the normal type to SH01 with the handle from, and repair the handles after long term operation without throwing the whole valve set. It is very economic to stock the spring handles only.
SH01 is suitable for this type of valves, especially for the following 2-way ball valves.
That allows users to wisely stock valve & spring handle separately.