According to requirements of customer, special specification and model products can also be desinged and manufactured.

Kelly Cock Valve is a manual control valve in drilling string cycle system. It is one of the effective tools for preventing blowout. It is divided into upper kelly cock valve and lower kelly cock valve. Upper kelly cock is located at the position between lower end of swivel and the top of kelly stem. Lower kelly cock is located at the position between lower end of kelly stem and drilling rod or kelly stem saver sub.