Shanghai Jianggong Valve Manufacturing Co., Ltd.
Shanghai Jianggong Valve Manufacturing Co., Ltd. Industrial valve expert With safe and reliable products To provide you with thoughtful services
Add to Cart
Fire Fighting System Use Ductile Iron Pressure Holding And Safety Relief Valve
Product introduction:
Fire fighting valve products are control accessories on industrial and building pipelines. Fire fighting valve is the most important controlled accessory on industrial and building pipelines, normally consisting of valve body, opening and closing mechanism, and valve cover. Simple structure and reliable sealing.
Most fire valves are connected with clamps, making the complex valve installation and pipeline connection process simple, fast, and convenient. Taking pipeline connection technology a big step forward.
8500 series pressure holding and relief valve consists of a main valve, a guide valve, a needle valve, a ball valve, and a pressure gauge. As the guide valve, needle valve, ball valve, and pressure gauge are connected to the main valve through a conduit, they are collectively referred to as a conduit control system, as shown in the following figure.
When making a pressure relief valve, the main valve is installed on the drainage bypass, which is connected to the main pipeline in parallel. When the upstream pressure gradually rises than the set pressure, the main valve quickly opens to relieve pressure and reduce pressure. The pressure relief valve is mainly used to eliminate excessive pressure that gradually increases due to flow supply exceeding demand, such as in the early stages of fire protection in the fire hydrant system, automatic spraying, and various water supply systems.
When making a pressure holding valve, the main valve is installed on the main pipeline directly. As long as the water supply pressure upstream of the main valve is lower than the set pressure, the main valve is closed. When the water supply pressure upstream of the main valve exceeds the set pressure, the main valve will open to supply water downstream of the main valve, thereby ensuring the water supply pressure upstream of the main valve. It is mainly used to maintain the minimum water supply pressure of the urban main pipeline, especially in the event of a fire, It can prevent branch pipes from being used for excessive pumping and pressure reduction.
Product technical parameter:
| Nominal Diameter DN (mm) | 65~200 | |
| Nominal Pressure PN (MPa) | 1.6/2.5 | |
| Test Pressure (MPa) | Strength (water) | 2.4/3.8 |
| Enclose (Water) | 1.8/2.8 | |
| Working temperature | 0~80℃ | |
| Medium suitable | Water | |
Product features:
1. The valve body adopts streamlined design, small fluid resistance and large flow.
2. Dual sealing between valve body, bonnet, piston cylinder to ensure zero eakage.
3. The entire stainless steel piston cylinder, the whole cast pistons and NBR sealing ringto make a perfect combination of prolonging the service life greatly.
4. The band back bore in the piston cylinder, appropriate to increase the damping piston movement, which tend to be more stable.