Q: What is the function and type of check valve?
A: Check valves, also known as flow valves or check valves, only allow the medium to flow in one direction and prevent it from flowing in the opposite direction. They are used as pump stop protection devices in the outlet pipeline of water pumps. According to different structures, it can be divided into lift and swing check valves. Lift check valves can only be used on horizontal pipelines, while swing check valves can be applied on both horizontal and vertical pipelines

Q: What are the characteristics of ball valves?
A: Ball valves have the characteristics of compact structure, good sealing performance, simple structure, small volume, light weight, low material consumption, small installation size, small driving torque, easy operation, quick opening and closing, and convenient maintenance.

Q: What is the working principle of butterfly valve?
A: Butterfly valve, abbreviated as butterfly valve, rotates its disc (butterfly plate) around the valve axis to achieve the opening and closing action of the valve. When the butterfly plate is parallel to the fluid flow direction, the valve is in the open state and the fluid can pass smoothly; When the butterfly plate rotates perpendicular to the fluid flow direction, the valve closes, preventing the fluid from passing through. During the rotation process, the flow rate of the fluid can be adjusted by changing the angle between the butterfly plate and the fluid flow direction.

Q: How to maintain the valve during use?
A: The valve stem thread should be lubricated with butter or graphite powder; Valves that are not frequently opened or closed should have their handwheel turned regularly and lubricated; Outdoor valves should be equipped with protective sleeves for the valve stem; The valves of mechanical transmission should be lubricated with oil and kept clean on time for the gearbox; Do not let the valve support heavy objects or stand on the valve; Regularly clean the valve stem threads and add new lubricant.

Q: How to maintain valves when they are left unused for a long time?
A: Small valves are placed on shelves, while large valves are neatly arranged on the floor of the warehouse, without allowing the flange connection surface to touch the ground; Valves that are not in use in the short term should have asbestos packing removed; If there is rainwater or dirt on the inlet valve, it should be wiped clean; Seal the inlet and outlet of valves with wax paper or plastic sheets; The machined surface of valves that can rust should be coated with anti rust oil; Outdoor valves should be covered with oil felt or tarpaulin; The warehouse should be kept clean and dry.