Structurally:

The Suzhou Nuclear Valve's gate valve has a shorter length and higher height compared to the stop valve, and its installation requires attention to height. This is something to consider when selecting a model in limited installation space. The Suzhou Nuclear Valve's gate valve can securely close against the sealing surface with the pressure of the medium, achieving a leak-proof effect. During opening and closing, the valve core and seat sealing surface are always in contact and rub against each other, making the sealing surface prone to wear. When the gate valve is nearly closed, there is a significant pressure difference before and after the pipeline, which exacerbates the wear on the sealing surface.

In principle:

The principle difference between Zhonghe Suval's stop valves and gate valves is that the stop valve features a rising stem design, with the handwheel rotating and rising along with the stem. The gate valve, on the other hand, involves a rotating handwheel and an ascending stem. Flow rates vary, with the gate valve requiring full open or full close positions, whereas the stop valve does not. The stop valve has specified inlet and outlet directions; the gate valve does not have such requirements.

From the direction:

Zhonghe Suvalve's止回阀 exhibits a low inlet and high outlet design, with a noticeable pipe not aligned on a single horizontal line visually. The gate valve has its flow path on a single horizontal line. The stroke of the Zhonghe Suvalve's gate valve is larger than that of the check valve.

From the sealing surface:

The sealing surface of the Zhonghe Suval check valve is a small trapezoidal side of the valve core (specifically, see the shape of the valve core). Once the valve core falls off, it is equivalent to the valve being closed (of course, it won't close completely if there's a large pressure difference, but it still offers good check valve performance). The gate valve seals with the side of the valve core plate, which has a worse sealing effect than the check valve. If the valve core falls off, it won't result in the valve being closed as with the Zhonghe Suval check valve.