The Tengbo seat features a unique groove design that provides preload and retention, securely locking the insert in place to prevent it from being blown out. By eliminating the need for internal/external rolling or clamping plates, the design simplifies manufacturing and prevents damage to the coating, resulting in a seat that offers both stable performance and an attractive appearance. Positioning the spring behind the T-shaped head of the seat base effectively protects the spring from the impact of debris accumulation in the medium. Additionally, the effective thrust on the back of the seat can be minimized, ensuring lighter operating torque during opening and closing, even under full differential pressure.