Valve with sealing ring convenient to replace

The valve comprises a valve body, a valve plate, a valve rod, a valve cover and a hand wheel, the valve cover is fixedly installed on the valve body, a fluid channel is formed in the valve body, an opening and closing opening is formed in the valve body and located in the fluid channel, the valve plate is arranged at the opening and closing opening of the valve body, one end of the valve rod is fixedly connected with the valve plate, and the other end of the valve rod is fixedly connected with the hand wheel. One end of the valve rod is connected with the valve cover, the other end of the valve rod penetrates out of the valve cover, the valve rod is in threaded connection with the valve cover, a hand wheel is installed at the penetrating-out end of the valve rod, and the valve further comprises a sealing ring arranged at the opening and closing opening. The mounting groove is located above the opening and closing opening, the radius of the mounting groove is larger than that of the opening and closing opening