- Manually (with a handle or a gear);
- With an actuator (electric, pneumatic, pneumohydraulic or electrohydraulic);
- Underground (as per GOST R 56001, it is allowed to have a stem extension in accordance with Customer’s requirements));
Anti blow‐out stem
Allows safe replacing of a seal with closed trim and pressure applied in the operating gas pipeline.
Stem and gland extension
May be used to remove the operating device from the low temperature zone.
The valve stem gland has no less than three seals (lip or chevron type). The stem is mandatory equipped with a special maintenance-free seal that does not require the input of seal lubricant between the seals during design lifetime.
The cryogenic valve design has no option for seal lubricant input to the area of seats and stem seal in case of tightness loss.
To increase fire resistance, all polymer seals of valves are duplicated with TEG seals that help maintaining the valve tightness during long-term thermal impact (for emergency cases).