CN201554910U - Check valve - Google Patents

Abstract

The utility model relates to a check valve consisting of a valve body, a valve clack, a sealing ring and a spring, wherein the valve clack and a valve rod are cast into a whole; the valve body is cast into an L shape; the valve body is divided into a flow passing cavity and a valve rod sliding cavity; the sealing ring is arranged at the water inlet end of the valve rod; the spring is arranged between the valve clack and the valve body; and the valve rod is arranged in the valve rod sliding cavity after passing through the spring. When a water inlet exists pressure, the water pushes the valve clack to move backwards, the valve clack drives the valve rod to move backwards in the valve rod sliding cavity, and at the moment the water can flow out of an outlet by a valve, and simultaneously the valve clack reduces the resistance of water; when the water inlet does not exist pressure (or the pressure is less than the pressure of the outlet), the push force for pushing the valve clack weakens (or reduces), the spring starts to expand and drive the valve clack to move forwards till the valve clack is contacted with the sealing ring of the water inlet so as to achieve the purpose of checking.

Description

A kind of safety check

One: technical field

The present invention relates to a kind of safety check that in supply and drain water system, uses, particularly a kind of lower resistance safety check that in water pump is supporting, uses.

Two: background technique

The safety check that uses in supply and drain water system in the prior art is because reasons in structure generally all such phenomenon can occur, and safety check hinders serious in use to the pressure of water in the system, causes that loss of head is big, energy consumption is big.

Three: summary of the invention

The objective of the invention is to: design a kind of safety check that in supply and drain water system, uses, make its hydraulic loss little, have the function of elbow.

The present invention adopts following structure to realize above-mentioned purpose, safety check is made up of valve body, flap, seal ring, spring, flap and valve rod are cast as one, valve body is cast " L " type, be divided into overcurrent chamber and valve stem slides chamber at valve body, seal ring is installed in the inlet end of valve body, and spring is installed between flap and the valve body, and valve rod is installed in the valve stem slides chamber after passing spring.

Adopt as above structure, because flap and water intake are in horizontal position together, water promotion flap moves backward when water intake has pressure, flap drives valve rod operation backward in the valve stem slides chamber, at this moment water just can be flowed away by outlet by valve, simultaneously flap has reduced resistance to water (flap of conventional safety check has been in the middle of the flowing to of water, hydraulic loss is very big, see Fig. 2), when water intake does not have pressure (or less than outlet pressure), thrust decay (or hour) spring that at this moment promotes flap begins to uphold, promotes flap and move forward, up to contacting, reach the purpose of non-return with this with the seal ring of water intake.Because valve body is cast as " L " type, just not be used in the configuration elbow like this in the system (conventional system all needs to dispose elbow in the outlet of water pump), reduced cost of material and labor strength.

Four: description of drawings

Fig. 1 is a sectional drawing of the present invention

Fig. 2 is conventional check valve structure schematic representation

Five: embodiment

A kind of safety check, comprise: valve body 1, flap assembly 2, seal ring 3, spring 4, valve body 1 is cast " L " shape for foundry goods, valve body 1 is divided into overcurrent chamber 5 and valve stem slides chamber 6, water intake 7 and water outlet 8, flap assembly 2 and valve rod 9 are cast as integral body, earlier spring 4 is enclosed within on the valve rod 9 during the valve assembling, then flap assembly 2 is entered in the valve body 1 by water intake 7, and with in the valve rod 9 embedding valve stem slides chambeies 6, again seal ring 4 is installed on water intake 7 places of valve body 1, at this moment the length of spring 4 should be able to make the flap end face of flap assembly 2 be close to seal ring 3 and form sealing surface, so just solved sealing problem, water promotes flap assembly 2 operation backward when water intake 7 has hydraulic pressure like this, thereby make safety check be in open mode water and just can flow to water outlet 8 by water intake 7, at this moment the flow-passing surface of water has not had any just stopping can flow to outlet, reach the purpose that reduces hydraulic loss, when water intake 7 pressure reduce (or not having pressure), at this moment since the pressure of water outlet 8 greater than water intake 7, at this moment the thrust of flap assembly 2 has just disappeared, flap assembly 2 is owing to the tension force of spring 4 promotes to seal ring 3 operations like this, finally get back to original state and form sealing surface with seal ring 3, reach the purpose of non-return with this, just do not need to have disposed elbow separately again because valve body 1 is cast in the such system of " L " type.

Claims (1)

1. a safety check is made up of valve body, flap, seal ring, spring, it is characterized in that: the flap and the valve rod of safety check are cast as one, valve body is cast " L " type, be divided into overcurrent chamber and valve stem slides chamber at valve body, seal ring is installed in the inlet end of valve body, spring is installed between flap and the valve body, and valve rod is installed in the valve stem slides chamber after passing spring.

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