- 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).
Wear-resistant coating is applied to ball and seats
Tungsten carbide is applied to surfaces of ball and seats by high-velocity oxygen fuel spraying with 150 to 500 µm thickness and hardness not less than 1100 HV.
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 input system is not required for lubricating the stem seal, but can be provided as per the Customer’s request.
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).