Cast iron round gate is mainly used in water supply and drainage, flood control, irrigation, water conservancy, hydropower projects, to cut off, dredge water flow or regulate water level. This series of gate can be divided into three types: zmf square gate, zmy round gate and ZML flange round gate.

　　It is made of gray cast iron, nodular cast iron and stainless steel. The sealing surface is inlaid with copper bar or rubber. After precision processing, it is matched and researched to achieve plane contact sealing. The sealing performance is good. When the sealing performance decreases, it can be solved by adjusting the wedge device.

　　The structure characteristics and working principle of cast iron round gate are as follows

　　1. Cast iron gate and cast iron round gate are composed of door frame, gate, guide rail, sealing strip, transmission screw, lifting block nut / lug and adjustable sealing mechanism. The gate frame and gate are made of gray cast iron or nodular cast iron. The guide rail is symmetrically arranged on the left and right and connected with the two ends of the gate frame with stainless steel bolt positioning pin (for small and medium-sized gates, the guide rail can be poured with the gate frame) The length of the guide rail is generally 1 / 2-1 / 3 of the full opening height of the gate, so the overall structure has high strength, high rigidity, good wear resistance, corrosion resistance and high bearing capacity.

　　2. The sealing material is copper alloy or rubber, and the sealing performance is good after precision machining.

　　3. It is easy to install, debug, use and maintain and has long service life.

　　4. All kinds of specifications, wide adaptability.

　　5. It is used together with the hoist. The gate is the working part, and the hoist is the executive part of the gate opening and closing. The hoist is driven by human power, motor or pneumatic, hydraulic mechanism to drive the gear, worm and so on of the transmission device. The transmission nut or screw is driven to rotate to make the gate shaft move vertically, so as to open or close the gate and achieve the goal The purpose of water supply, water shut-off or water level regulation.

　　Main technical performance parameters of cast iron round gate:

　　1. Model and specification:

　　Round gate: zmqy with rising stem DN300 ～ DN 1500mm

　　2. Main performance indexes of cast iron gate and cast iron round gate:

　　1. The fit clearance of gate sealing surface is less than 0.1 mm, and the thickness of sealing seat is more than 10 mm.

　　2. Leakage per meter of sealing surface: forward direction ≤ 0.7l/min · m, reverse direction ≤ 1.25l/min · M

　　3. Nominal pressure ≤ 0.1MPa; sealing test pressure 0.1MPa.

　　4. Working environment: temperature - 20 ℃ ~ 120 ℃, humidity: 95%, working medium: water and sewage, pH value: 5 ~ 10.

　　5. Installation position: under normal condition, it is facing the water and is in the vertical state.

　　6. Maximum working head: unidirectional compression: forward: 10M, reverse: 5m, bidirectional compression: both 10m

　　7. Opening and closing speed: not less than 0.2m/min, not more than 1.5m/min.

　　8. The distance between the gate frame and the side wall is ≥ 300 mm, and the distance between the gate frame and the pool bottom is ≥ 150 mm ~ 250 mm.

　　Cast iron gate, cast iron round gate specification is complete, from 0.2x0.2-6.5x6.5m6.5x6.5m, and according to customer needs casting rectangular gate mass production and sales. The shape of cast iron gate after forming is mostly square, round, fan-shaped and arc-shaped. But there are different requirements in casting, according to the needs of customers casting gate.

　　The shape of cast iron gate after forming is mostly square, round, fan-shaped and arc-shaped. However, there are different requirements in casting, according to the needs of customers casting appropriate gate.