1. The fluid is depressurized step by step, and its direction changes continuously, which increases the flow resistance and prevents cavitation when the pressure difference of the liquid flowing inside the valve reaches 24MPa.
2. The valve core features 4-stage throttling, and a throttling element is arranged on the lower side of the valve seat sealing surface to improve the fluid flow state, with the fluid velocity being around 30m/s.
3. The throttling surface is separated from the sealing surface. The surfaces of the valve core, valve core sleeve, valve core rod and throttling element are hardened to a hardness of approximately HRC70, ensuring tight closure and a long service life.
4. The surface of the valve core is provided with large notches, so even if the fluid contains solid particles such as 2-3mm welding slag, the valve core will not get stuck and can move flexibly.

Performance
Leakage: Conforms to ANSI B16.104 Class Ⅳ, less than 0.01% of the rated Cv
Allowable pressure difference: 24MPa

Structure diagram

​

• A 125MW unit is equipped with two 100% capacity electric feed water pumps, one in operation and one as a standby.
• A 200MW unit is configured with three 50% capacity electric feed water pumps, two in operation and one as a standby.
• A 300MW unit is equipped with two 50% capacity pneumatic pumps for normal operation, and one electric feed water pump with a capacity not exceeding 50% as a standby, with the model DG-370-240.

​Installation method
Install vertically. There are two ways for the relative position of the inlet pipe and the outlet pipe, as shown in the figure below.