Pneumatic shut-off valve for normally closed single acting ammonia water storage tank

Pneumatic shut-off valve for normally closed single acting ammonia water storage tank-Pneumatic shut-off valve for ammonia storage tank - Pneumatic shut-off valve for ammonia storage tank

Model: QDQ641F-40P

Overview of Pneumatic Cut off Valve:

The pneumatic cut-off valve of the ammonia water storage tank is composed of a fireproof and anti-static ball valve and a pneumatic actuator. The pneumatic actuator structure is divided into a double acting pneumatic actuator (normally open) and a single acting pneumatic actuator (normally closed). The remote control of the cut-off valve is achieved through the control of the explosion-proof solenoid valve coil. Pneumatic cut-off valves can achieve centralized automation control, quickly open or close pipelines, and effectively control and manage emergency situations in storage tanks, pipelines, and workshop production.

Pneumatic shut-off valve for ammonia water storage tank

Execution standards for pneumatic cut-off valves in storage tanks:

1. Design and Manufacturing: GB12237-89, API608, API 6D, JPI 7S-48, BS5351, DIN3357.

2. Flange size: JB/T74～90（JB74～90）、GB9112～9131、HGJ44～76、SH3406、ANSI B16.5、JIS B2212～2214、NF E29-211、DIN2543。

3. Structural length: GB12221-89, ANSI B16.10, JIS B2002, NF E29-305, DIN3202.

4. Main test for inspection: JB/T 9092, API 598.

Working principle of ammonia pneumatic cut-off valve:

1. When the pneumatic actuator is connected to the circuit and system air source, air enters cylinder A (cylinder B) through pipe A or B to push the piston towards one end, thereby driving the rotating shaft and ball core to rotate 90 °.

2. The top of the pneumatic actuator is linked with a visual device, and when the green sign points to the word "open", it indicates that the valve is open.

3. When the green light of the reply signal light is on, the valve is in the open position, and when the red light is on, the valve is in the closed position.

4. The air pressure reducing valve can filter moisture and impurities and regulate the pressure of the air source.

Pneumatic shut-off valve for liquid ammonia storage tank

The manual part of the emergency shut-off valve can use a steel plate pressed handle. The handle is equipped with a limit structure, which sets limits at the opening and closing positions of the valve. When the valve is used on a (pneumatic/manual) device, the limit block is equipped with a locking hole to lock the switch position and avoid misoperation. There are obvious open and close markings on the handle. The function of the handwheel mechanism is to directly operate the emergency shut-off valve to maintain normal production when the control system loses power, gas, the controller has no output, or the actuator fails.

Pneumatic shut-off valve for normally closed single acting ammonia water storage tankSprings are installed between the ball core, valve stem, and valve body to dissipate static electricity generated during the switching process. The bottom mounted valve stem and the protruding step at the valve stem head prevent the valve stem from spraying out. In the event of a fire causing damage to the valve stem seal, metal contact can also be formed between the protruding step and the valve body to ensure valve stem sealing. The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time. Due to the good self-lubricating properties of materials such as polytetrafluoroethylene, the friction loss with the ball is small, so the service life of the pneumatic cut-off valve is long.

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