The valve assembly includes valve body, valve cap, valve rubber, valve seat,
righting support, and valve spring. Valve body and seat are made of alloy steel,
heat-treated strictly, with high facial hardness and good internal tenacity, anti-
fatigue, impact resistance, and tight angle matching. The valve rubber is made of
wear-resistant material, such as oil-proof rubber and epoxy resin. There are all
kinds of specifications and types such as SH300 vehicle, AC-400B, 400C, ACF-
700B, 350 type 35-15, international vehicle, 70-265 pump, 1000 type mud pump.