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.
