What is the role of the expansion valve? It works?

What is the role of the expansion valve? It works?
The electronic expansion monoblock valves is a new throttle device, which is controlled by a microprocessor, it appears to achieve a computer direct control and regulation of the refrigeration cycle. Electronic expansion valve and stepper motor type solenoid type two structural forms . Strictly speaking, the electromagnetic coil is a solenoid-type expansion valve. Now we are talking about the current electronic expansion valve usually refers to the stepper motor type. It consists of the valve body, valve, bellows, transmission and pulse stepper motor and other components. Pulse stepper motor drive mechanism, the bellows is a refrigerant passage with moving parts separated to prevent refrigerant leaks. Role of the drive mechanism is rotary motion of the motor into reciprocating motion of the spool. There are two kinds of transmission, gear transmission mechanism includes gear pairs, rib pairs, such as the transmission lever. Direct-acting actuator no gear pair.
Characteristics of electronic expansion valve to regulate large-scale, rapid and sensitive action, adjust precision, stable and reliable. The refrigerant in the electronic expansion valve can be positive, the reverse flow in both directions, avoiding the disadvantages of only one direction of the thermal expansion valve. Refrigeration system can be greatly simplified for the heat pump when. The cooling system is down, the electronic expansion valve can be completely closed, so that no need to install the refrigerant inlet solenoid valve.

Sequence valve works it?

Sequence valve works it?
How it works:
According to the working principle and structure, sequence valve direct-acting and pilot sub-type categories; by pressure control mode, the sequence valve has internal and external control of the points. In the sequence valve installed in a one-way valve, can be called a reverse flow check valve composite sequence valve. Generally, the valve use more.
Functions and applications:
The basic function is to control the sequence hydraulic valve block actuators multiple sequential actions, depending on their functions, called sequence valve, back pressure valves, relief valves and balancing valves. Relief sequence valve performance and essentially the same, but because of the different functions of the sequence valve as well as its special requirements:
(1) In order to achieve accurate actuator action sequence, the order requires high precision pressure regulator valve, the deviation is small;
(2) the accuracy of the order of actions in order to require a small amount of leakage within the aluminium valves is closed;
(3) For one-way sequence valve, pressure loss and requires reverse positive pressure loss values should be compared with the school
       The main role of sequence valve are:
(1) controlling the operation sequence of the plurality of elements;
(2) for packing loop;
(3) to prevent the weight of the free-fall and cause cylinder piston do with balancing valves;
(4) with external control sequence valves do unloading valves, pump unloading;
(5) with internal sequence valve for back pressure valve.

Hydraulic valve

Hydraulic valve
The basic construction of the hydraulic valve manifold including spool, and driving the spool valve within the valve body for relative movement manipulation apparatus. The main form has a spool valve, poppet valve and ball; the body in addition to a body orifice or valve seat and valve fitting hole, there are external tubing into and out of the oil port and drain; actuated valves core in the valve body for relative movement means may be a manually adjustable mechanism, may be a spring or a solenoid, some occasions also driven by liquid pressure. On principle, the use of hydraulic valve spool relative movement in the valve body to control the on-off valve port and the size of the opening, in order to achieve pressure, flow and direction control. www.168fm.cn working hydraulic valve, the valve orifice size of all valves, valve inlet pressure difference between the oil port and through the relationship between flow valve orifice flow equation are consistent with (q = KA · Δp m) , but a variety of valve control parameters vary only.

Hydraulic valve job role

Hydraulic valve job role
1, acting hydraulic valves, types and common; the role of hydraulic flange, types and common; one-way valve, check valve working principle and its application;
2-way valve, check valve works and application; spool type valve commutation principle, spool type valve commutation principle, "bit", "pass", spool function (median performance) and manipulate the way the application; "slide valve function (median performance)," ways to manipulate and use; relief valves, valves, sequence valves
3, relief valve, pressure relief valve, sequence valve, the working principle and application of pressure relay; for Principles and Applications;
Characteristics of the throttle, the main structure and working principle;
  4, the characteristics of the throttle, the main structure and working principle; a typical control valve structure, working principle;

Bsp fitting suitable for most industrial

Bsp americanhydraulicadapter suitable for most industrial applications using bright nickel plated brass compact design, safe and reliable, corrosion in need are equipped with a gasket at the NPT, PT, NPT G distinguish the various threads, PT, G is the tube thread. NPT is the National (American) Pipe Thread abbreviation belonging American standard 60-degree taper pipe thread, for North America. National standards can be found on the National Pipe Thread standard GB/T12716-1991 PT is the acronym is 55 degrees sealing tapered pipe thread, the thread is Wyeth family, and more for Europe and the Commonwealth countries. Water and gas pipes commonly used in the industry, the taper is defined as 1:16. National standards GB/T7306-2000 G is available 55 degrees non-thread sealing pipe thread, the thread is Wyeth family. Labeled G represents cylindrical thread. GB/T7307-2001 national standards can be found in another thread 1/41/2, 1/8 mark refers to the thread size of the diameter, the unit is English?. Insiders often used to refer to the thread size of one? Equal to 8 points, 1/4? Is 2 points, and so on. G is the pipe threads collectively (Guan), 55, 60 degrees are divided into functional, commonly known as the tube round. That thread processing is made by a cylindrical surface. ZG commonly known as Cone, the thread processing by a conical surface made ??of pipe joints in general are like this, Rc GB labeled with metric thread pitch to represent the United States and Britain screw threads per inch number to represent this is the biggest difference between them, metric thread is 60 degrees equilateral tooth type, inch thread is 55 degrees isosceles tooth type, US-made thread 60 degrees. Metric thread with metric units, threaded with U.S. and British Imperial units. Pipe thread is mainly used to connect pipes, its internal and external thread closely, there are two kinds of straight pipe with cone. Nominal diameter refers to the diameter of the pipe is connected, apparently the thread diameter larger than the nominal diameter. 1/4, 1/2, 1/8 inch thread is the nominal diameter in inches.

jic female swivel fitting leak prevention

In the hydraulic system, both the metal pipe fitting, hose fitting, or are prone to leakage problems. For card sets of pipe joints, mostly due to the pipeline by a larger force or impact, so that jic swivel fittings the card sleeve loose or pipe end surface deformation caused by leaks, you should check whether the card sets out of round, edge or without defects, whether the pipe ends in good condition and the extent of compression ferrule nut, but also eliminate the pipeline force. For flared fittings, mostly due to excessive flaring, substandard quality requirements or repeatedly demolished, resulting in flaring deformation or cracks caused by the leak, this time jic female swivel hydraulic hose assemblies can be re-flared front amputated. If you use a male and female cone top pressure seal, which is mostly due to the two cone leak damage, is available on the cone grinders for grinding. In some with "о" or outer-ring seal on the end face of the occasion, the leakage following reasons: "о" ring deformation caused by aging or leakage; "о" ring assembly is not in place, so that the two-plane connection when the pressure is uneven or "о" ring is cut cause leakage; "о" ring is not compacted, less elastic deformation caused by leakage; "о" mouth-ring groove just too deep and cause leaks. In this regard, the need to re-select the same diameter and cross-sectional thick "о" rings can also be sealed with a flat opening slot stop cutting or grinding to reduce the groove depth mouth only to make "о" rings are sufficiently resilient deformation (compression typically be between 0.35-0.65mm). For use oil sheet, wool felt, soft steel board, combination gasket sealant joints or pipe leaks, no matter what the material is, you should first check the seals for damage, deformation, aging and rough through the large, etc. and then take the appropriate measures.

Installation Notes bsp swivel fittings of

(1) female swivel fitting in mobile or stationary, and can not bend over, it can not bend at the root,hydraulic hose crimping machine at least to start bending at 1.5 times its diameter;
(2) hose is moved to the extreme position not pull too tight, should be more relaxed;
(3) try to avoid the hose twisting deformation;
(4) hose as far away from the heat radiating member, jic nipples fashion necessary insulation board;
(5) Avoid hose external damage, such as the use of the same term component surface friction;
(6) If the hose weight caused excessive deformation, should support members....