Another functional connection that is mostly used in the sewage industry is cast iron valves, which are produced from gray cast iron and ductile cast iron. These valves are used to cover the sewer manholes in different parts of the streets to control water, electricity, gas, etc.
Application of cast iron valves
The main use of cast iron manhole valves is to cover the opening of manholes and access wells to underground lines. With this, in addition to preventing incidents such as people and vehicles falling into manholes and safe traffic on the streets and sidewalks, in the time needed to visit the sewers, technicians from underground facilities (such as power lines and telecommunications) , gas, water and sewage) can be provided by removing the cast iron valves to provide access to these facilities and carry out the necessary repairs if needed.
Among the other applications of cast iron frames and valves, we can refer to the transfer of rainwater and surface runoff to urban sewage systems.
Composite valve
Composite is made by combining two or more substances together in such a way that they are chemically separate and, in other words, insoluble. In another definition, composites are things that are made of different materials and different in form and composition, and their components have kept their identity and have not been dissolved with each other.
In today's era, one of the problems that threatens the country's infrastructure is the issue of collecting urban and industrial wastewater and surface water. In order to use urban sewage systems, we need tools and equipment such as manholes and manhole valves that can transfer surface water as well as domestic and industrial waste water to the sewage treatment plant. Composite manhole valve is because of the advantages that Composite has been used more.
Composite valve is obtained from the combination of materials and polymer resins and other chemicals. Composite valve due to cost reduction, high mechanical and hydraulic resistance and high chemical and even thermal resistance and resistance to fire, corrosive chemicals and erosion are growing strongly and replaced by metal products.
