The invention discloses a
water hammer eliminating and pressure reducing device for valve protection. The
water hammer eliminating and pressure reducing device comprises a first connecting
pipe, a device body and a second connecting
pipe which are sequentially arranged from left to right. The
water hammer eliminating and pressure reducing device has the advantages that in the water hammer eliminating and pressure reducing device, on one hand, in a first straight plane, a first inclined plane, a second straight plane, a second inclined plane and a third straight plane with the widths constantlyincreased, according to the Bernoulli principle, the
water pressure is gradually reduced when the width is gradually increased; on the other hand,
water flow constantly extrudes a plurality of pistonplates, a second spring is compressed, air in a first compression cavity and a second compression cavity passes through a first communication
pipe and a second communication pipe to be pressed into first flow stopping bags and second flow stopping bags, the first flow stopping bags and the second flow stopping bags in a plurality of acting pieces can form flow stopping planes for closing a waterpassing port, and valve impacts are avoided; and due to
compressibility of air, a third compression cavity can further achieve the
pressure reduction function, the water hammer is thoroughly eliminated, the structure is simple, and the manufacturing cost is low.