1. One-way valve is generally suitable for cleaning medium, not suitable for containing solid particles and larger viscosity of the medium.

2. For low pressure one-way valve below DN50mm, butterfly one-way valve, vertical lift one-way valve and diaphragm one-way valve should be selected; For dn200-dn1200 medium and low pressure one-way valve, it is advisable to choose the ball return valve without wear; For DN 50-dn 2000 low pressure one-way valve, butterfly type one-way valve and diaphragm type one-way valve should be selected.

3. It is applicable to the pipeline which is prone to water shock. The diaphragm can well eliminate the water shock caused by the adverse flow of the medium.

4. For the pipeline with small or no water impact when the water impact is required to close, it is appropriate to choose the slow closing swing type one-way valve and slow closing butterfly type one-way valve.

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Annex：