Tungsten carbide Seats and Valves are applied into various oil and gas filed, oilfield valves, Coal chemical industry. In the condition of long and harsh working period , tungsten carbide valve is the best choice. At the same time, tungsten carbide valve and seat has the following advantages: low noise and high wear-resistance; high hardness, high compressive strength; Good chemical stability and low impact toughness; low expansion coefficient; heat conduction and electric conduction.