Working principle of American FAIRCHILD pressure reducing valve

Brand

FAIRCHILD/Fairchild Technology (USA)

Application Areas

Medical & Health, Environmental Protection, Food/Agricultural Products, Agriculture, Forestry, Animal Husbandry & Fishery, Comprehensive

FAIRCHILD Pressure Reducing Valve

FAIRCHILD Control Valve

FAIRCHILD Frequency Converter

FAIRCHILD Controller

FAIRCHILD Water Separator Filter

The American FAIRCHILD pressure reducing valve is an accessory for pneumatic control valves. Its main function is to reduce and stabilize the pressure of the air source to a fixed value, so that the control valve can obtain a stable air source for regulation and control. According to its structure, it can be divided into diaphragm type, spring diaphragm type, piston type, lever type, and bellows type; according to the number of valve seats, it can be single-seat or double-seat; according to the position of the valve disc, it can be divided into direct-acting and reverse-acting types.

The basic operating principle of the American FAIRCHILD pressure reducing valve is to reduce the water pressure by the local resistance of the water flow in the valve's internal flow channel. The range of water pressure drop is automatically adjusted by the pressure difference between the inlet and outlet water on both sides of the diaphragm or piston connected to the valve disc.

The American Fairchild pressure reducing valve operates on a proportional pressure reduction principle, utilizing the water pressure ratio controlled by a floating piston within the valve body. The pressure reduction ratio at the inlet and outlet is inversely proportional to the piston area ratio on both sides. This type of valve operates smoothly without vibration, further improving domestic pressure reducing valve manufacturing technology. The valve body is springless, eliminating concerns about spring corrosion and metal fatigue failure. It boasts excellent sealing performance, preventing leakage, thus reducing both dynamic pressure (when water is flowing) and static pressure (when the flow rate is zero). Notably, it does not affect the water flow rate while reducing pressure. Pressure reducing valves are typically available in various sizes from DN15 to DN100, with upstream and downstream working pressures of <1MPa and 0.1–0.5MPa respectively, and a pressure adjustment range error of ±5%–10%.

The American Fairchild pressure reducing valve is based on the general-purpose standard JB/T2203-1999 "Pressure Reducing Valve Structural Length". Currently, most domestic pressure reducing valve manufacturers design and manufacture according to this standard, but this standard is not exhaustive, and specifications are incomplete. For example, the maximum nominal diameter for gas pressure reducing valves is DN500, and for water pressure reducing valves, it is DN1000. Based on the specifications of the pressure reducing valves produced by different manufacturers and the available information, the connection dimensions vary. For example, for a DN500 gas pressure reducing valve, it is recommended that the General Machinery Research Institute revise JB/T2203-1999 "Structural Length of Pressure Reducing Valves". Design institutes and users are advised to select valves according to the standard, and pressure reducing valve manufacturers should design and manufacture according to the standard.

The American Fairchild pressure reducing valve reduces the inlet pressure to a desired outlet pressure through regulation, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. From a fluid mechanics perspective, the pressure reducing valve is a throttling element with variable local resistance. That is, by changing the throttling area, the flow velocity and kinetic energy of the fluid are altered, resulting in different pressure losses, thereby achieving pressure reduction. Then, through the regulation of the control and adjustment system, the fluctuation of the downstream pressure is balanced with the spring force, keeping the downstream pressure constant within a certain error range.

Fairchild has distributors worldwide, providing localized service. Our factory engineers can solve all kinds of problems for you and provide products suitable for your needs. Our reputation is built on high-quality products, excellent service, and rapid response to customer needs. Our energy transmitters offer high-quality mechanical speed control with minimal speed difference. This technology is the foundation of our development and has positioned the company at the forefront of the energy transmission field. For 50 years, industry has trusted our energy transmission equipment for its reliable performance in speed and position control. Our transmitters are widely used in combined tension control and precise speed adjustment in printing, papermaking, packaging, and textiles. Additionally, our transmitters are used in machine tools, conveyors, synchronization, and other OEM applications. Every transmitter shipped is optimized for its specific application.

Fairchild has established a strong reputation in the industry due to its high-quality products, excellent customer service, timely delivery, competitive pricing, and prompt response to customer needs.

The company mainly deals with European and American brands and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson subsidiaries)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi

Our business scope includes:

Hydraulic components such as:

Solenoid directional valves, directional valves, check valves, stack valves, relief valves, counterbalancing valves, proportional valves, manual directional valves, flow valves, pressure reducing valves

Throttle valves, pressure control valves, back pressure valves, filling valves, flow dividers, shuttle valves, pressure relays, cartridge valves, pneumatic valves, piston pumps

Gear pumps, vane pumps, cycloidal hydraulic motors, oil coolers, hydraulic cylinders, etc. Pneumatic components include:

Air source processor assemblies, filters, pressure regulating valves, oilers, solenoid valves, pneumatic valves, angle seat valves, manual valves, pull valves, foot valves;

Mechanical valves, check valves, vacuum generators, cylinders, magnetic switches, dampers, pressure gauges, quick couplings, floating couplings;

Pressure gauge switches, water coolers, electric positioners, PU tubing, vacuum suction cups, oil filters, vibrators;

Electrical components include:

Relays, sensors, converters, proximity switches, encoders, programmable controllers;

The company maintains a large inventory, with standard parts readily available. To better serve customers in various industries, the company also distributes other spare parts, with professional sourcing channels and reasonable prices.

The company's products are widely used in industrial machinery, machine tools, plastic machinery, shoe machinery, brick machinery, metallurgy, mining, chemical industry, papermaking, coal mining, shipbuilding, etc.