Unloading valve introduction and principle

The basic concept Unloading valve is under certain conditions, can make the hydraulic pump unloading valve. Unloading valve and relief valve Unloading valve is usually a two-way two-way valve (often solenoid valve) relief valve, the function is not used when unloaded to set the system (pump) the main pressure, when the unloading State (by two two-way valve action conversion) pressure oil directly back to the tank, the system pressure value of 0. In order to achieve some of the loop control and improve pump life, reduce power consumption. In the loop are merged into the loop. Pressure reducing valve used to adjust the pressure required for the implementation of components is in series in the loop, the general can not be used interchangeably. Unloading valve works Unloading relief valve by the relief valve and check valve. When the system pressure reaches the opening pressure of the relief valve, the relief valve opens and the pump unloads. When the system pressure drops to the relief pressure of the relief valve, the relief valve is closed and the pump is loaded to the system. When the pump unloading pressure is called unloading pressure, the pump is in the state of loading pressure is called the loading pressure.

China Threaded Fittings,Pipe Threaded Fittings supplier & manufacturer,

Size: 1/2''~6'' 

Class Rating: 3000~6000 

Facing: RF(raised face);FF(flat face);RTJ(ring type joint);RJ(ring joint face) 

TG(tongue and groove face);MFM(male and female face) 

Manufacturing process: Push, Press, Forge, Cast, etc. 

 

Material: 

Carbon steel:

ASTM A105;  

ASTM A266 GR.1,GR.2,GR.3,GR.4 

 

Stainless steel: 

304/SUS304/UNS S30400/1.4301

304L/UNS S30403/1.4306;

304H/UNS S30409/1.4948;

309S/UNS S30908/1.4833

309H/UNS S30909;

310S/UNS S31008/1.4845;

310H/UNS S31009;

316/UNS S31600/1.4401;

316Ti/UNS S31635/1.4571;

316H/UNS S31609/1.4436;

316L/UNS S31603/1.4404;

316LN/UNS S31653;

317/UNS S31700;

317L/UNS S31703/1.4438;

321/UNS S32100/1.4541;

321H/UNS S32109;

347/UNS S34700/1.4550;

347H/UNS S34709/1.4912;

348/UNS S34800;

 

Alloy steel: 

ASTM A694 F42/F46/F48/F50/F52/F56/F60/F65/F70;

ASTM A182 F5a/F5/F9/F11/F12/F22/F91;

ASTM A350 LF1/LF2/LF3;

 

Duplex steel: 

ASTM A182 F51/S31803/1.4462;

ASTM A182 F53/S2507/S32750/1.4401;

ASTM A182 F55/S32760/1.4501/Zeron 100;

2205/F60/S32205;

ASTM A182 F44/S31254/254SMO/1.4547;

17-4PH/S17400/1.4542/SUS630/AISI630;

F904L/NO8904/1.4539;

725LN/310MoLN/S31050/1.4466

253MA/S30815/1.4835;

 

Nickel alloy steel:

Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;

Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;

Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;

Alloy K-500/Monel K-500/NO5500/2.475;

Alloy 600/Inconel 600/NO6600/NS333/2.4816;

Alloy 601/Inconel 601/NO6001/2.4851;

Alloy 625/Inconel 625/NO6625/NS336/2.4856;

Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;

Alloy 800/Incoloy 800/NO8800/1.4876;

Alloy 800H/Incoloy 800H/NO8810/1.4958;

Alloy 800HT/Incoloy 800HT/NO8811/1.4959;

Alloy 825/Incoloy 825/NO8825/2.4858/NS142;

Alloy 925/Incoloy 925/NO9925;

Hastelloy C/Alloy C/NO6003/2.4869/NS333;

Alloy C-276/Hastelloy C-276/N10276/2.4819;

Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;

Alloy C-22/Hastelloy C-22/NO6022/2.4602;

Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;

Alloy B/Hastelloy B/NS321/N10001;

Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;

Alloy B-3/Hastelloy B-3/N10675/2.4600;

Alloy X/Hastelloy X/NO6002/2.4665;

Alloy G-30/Hastelloy G-30/NO6030/2.4603;

Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;

Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;

Alloy 31/NO8031/1.4562;

Alloy 901/NO9901/1.4898;

Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;

Inconel 783/UNS R30783; 

NAS 254NM/NO8367;

Monel 30C

Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952

Nimonic 263/NO7263

Nimonic 90/UNS NO7090;

Incoloy 907/GH907;

Nitronic 60/Alloy 218/UNS S21800

SALES@GHSAILINGPIPE.COM

A threaded pipe is a pipe with a thread. They are often used in water gas pipes, small diameter water pipes, compressed air pipes and low pressure steam pipes. The pipe is connected to the pipe end with the thread. The thread can be coated with suitable adhesive (such as thick white paint, lead oxide glycerin adhesive, etc.) to ensure sealing.

There are mainly internal teeth, external teeth, live tube, elbow (elbow), three way pipe, four way pipe (crosshead) and reducer.Manufacturing standards:

GB/T 14383, ASME B16.11, BS 3799, MSS SP 83

Threaded Fittings

Threaded Fittings,Pipe Threaded Fittings,Steel Threaded Fittings,Forged Threaded Fittings

He Bei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com