Hydraulic emergency shut-off valve QDY421F

Product Name: Stainless Steel Hydraulic Emergency Cut off Valve
Product model: QDY421F-16/25/40P
Product specifications: DN15-DN300
Pressure rating: 1.6Mpa-2.5Mpa-4.0Mpa
Applicable media: liquid ammonia, ammonia, natural gas, liquefied gas
Operating temperature: -40~+80 ℃
Valve body material: stainless steel 304, 316, 304L, 316L, cast steel

Stainless steel hydraulic emergency shut-off valve is a safety protection valve installed on liquid ammonia, ammonia, liquefied petroleum gas (gas), liquid and gas pipelines. It is used in conjunction with a remote hand-operated oil pump (SB03-175 type) and uses hydraulic control to open and close the valve, so that in the event of a large amount of leakage or even fire on the pipeline or storage tank, the hand-operated oil pump can be quickly manually depressurized, or high temperature can melt the fusible alloy. The oil cylinder of this valve automatically depressurizes, and the valve quickly closes to stop leakage, providing safety protection Widely used in chemical hazardous material pipelines, gas supply pipeline systems, gas thermal energy factory workshops, gas boiler rooms, and residential safety facilities.

The stainless steel hydraulic emergency shut-off valve combines the advantages of globe valve, check valve, hydraulic valve, and manual valve, with excellent technical performance, low load loss, and high reliability. It is used to open the pressure relief valve of the hand-operated oil pump in case of emergency, quickly relieve the pressure of the oil pressure system, and automatically close the valve. Valves can quickly control the opening and closing of valves on pipelines or storage tanks from a distance, ensuring personal and property safety.

Stainless steel hydraulic emergency shut-off valve has the characteristics of simple structure, sensitive response, and reliable action. It can be widely applied in industrial production sectors such as gas, petroleum, chemical, and metallurgy. The hydraulic oil used for stainless steel hydraulic emergency shut-off valves should be a mixture of spindle oil and transformer oil that is free of impurities and particles.

Working pressure of oil cylinder: ≤ 6.0.Mpa
Oil cylinder medium: mixed spindle oil, transformer oil
Oil cylinder opening pressure: ≥ 2.0MPa
Oil cylinder operating temperature: ≤ 75 ℃

Melting temperature of (fusible alloy): 75 ± 5 ℃
Cut off time: Valve diameter less than or equal to DN65, closing time ≤ 5 seconds
Valve diameter greater than DN65, closing time ≤ 10 seconds

Oil cylinder and piston: ductile iron
Spring material: 50CrVA (spring steel)
Sealing ring, O-ring: polytetrafluoroethylene, nitrile rubber
Opening type: normally open, normally closed

The stainless steel hydraulic emergency shut-off valve is opened by reciprocating the hand cranked oil pump handle to increase the pressure and allow the medium to pass through. In case of fire or other emergency situations, the pressure relief valve of the hand cranked oil pump is opened, and the oil pressure system quickly releases pressure, causing the emergency shut-off valve to immediately close. When the temperature rises above 75 ℃, the fusible plug installed on the oil pump or emergency shut-off valve immediately melts, achieving the purpose of automatic pressure relief and causing the emergency shut-off valve to automatically and quickly close.

When multiple emergency shut-off valves are installed in the pipeline, two hand-operated oil pumps should be used for control, with one pump in operation and the other as a backup to prevent damage to the oil pump and prevent the valve from functioning properly. Each emergency shut-off valve should be controlled by a needle valve (J23H-40P).

1. When storing, seal all external passages of this valve with plugs or cover plates, and store it in a dry and ventilated room. For long-term storage, regular inspections should be carried out to eliminate dirt, and anti rust oil should be applied to the processing surface to prevent rusting.
2. Valves can be installed on horizontal or vertical pipelines for use. Before installation, remove the dust cover and clean the inside of the valve to prevent dirt from entering the valve body and damaging the sealing ring.
3. The emergency shut-off valve adopts the principle of a check valve, which can only cut off in one direction. The flow direction of the working medium of the valve is high in and low out. When installing, attention must be paid to the valve markings, and the end to be protected should be used as the valve inlet.
4. After the valve is opened for 12-14 hours every day, the valve disc should be promptly closed when the system is not working to avoid long-term compression of the spring and reduce the reliability of long-term use of the valve.
5. When ordering products, the flange sealing surface form, pressure rating, and connection standard must be specified.

The above is the product information of stainless steel hydraulic emergency shut-off valve. If you have any questions about the specifications, models, pictures, and technical parameters of stainless steel hydraulic emergency shut-off valve, please contact us for detailed information.