The valve of the KR thermal recovery well head assembly is provided with the parallel disc prevailing throughout the world presently,the valve body,bonnet,gate and stem are all fabricated form high temperature resistant materials having good creep properties.Therefore,the valve can resist the high temperature of 380°C,and its opening and closure are easy and not result in deformation under the high temperature and high pressure,non-metal sealing members are fabricated from high-temperature resistant materials ensuring good sealing characteristics for the380°Cworking condition.