Adjustment of the opening pressure of the relief valve:
1. Before leaving the factory, the opening pressure of the relief valve should be adjusted one by one to the set value required by the user. If the user proposes the working pressure level of the spring, it should generally be adjusted according to the lower limit value of the pressure level before leaving the factory. 2. Before installing the relief valve on the protected equipment or before installation, the user must readjust it at the installation site to ensure that the set pressure value of the relief valve meets the requirements. 3. Within the working pressure range of the spring indicated on the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the spring compression amount. 4. Before rotating the adjusting screw, the inlet pressure of the valve should be reduced to less than 90% of the opening pressure to prevent the valve disc from being driven to rotate and damaging the sealing surface. 5. To ensure accurate opening pressure values, the medium conditions during adjustment, such as medium type and temperature, should be as close as possible to the actual operating conditions. The type of medium changes, especially when the accumulation state of the medium is different, and the opening pressure often changes. 6. Conventional relief valves are used to fix the additional back pressure. When the opening pressure is adjusted after inspection (the back pressure is atmospheric pressure), the setting value should be the required opening pressure minus the additional back pressure.

1. Our packing uses export wooden cases, plastic boxes, cartons or pallets. All the package are very strong, the wooden box is firmly bound, the package is covered with a waterproof film to prevent water or damage during transportation.Before packing, we can also stick corresponding labels and shipping marks according to your needs. All our goods are well packed.
2. According to the quantity, we can use express delivery, air transportation or ocean transportation, automobile transportation, railway transportation, etc. we have our own freight forwarders, and we can also use the designated freight forwarders of customers, which can meet various delivery requirements of customers, such as EXW, FOB, CIF, etc.It can also be exported from many ports in China.

Jinan carman International Trade Co., Ltd. was established in 2003. Its main business is the export of truck parts to the Russian market.like shacman ,sinoturk m,faw .The company has its own warehouse in Jinan with an area of 2000 square meters.and have a large stock .And Ability to quickly collect and deliver goods.

1. who are we?
We are based in Shandong, China, start from 2013,sell to Mid East(50.00%),Eastern Europe(20.00%),Eastern Asia(10.00%),South America(7.00%),Southeast Asia(5.00%),Africa(4.00%),North America(3.00%),Domestic Market(00.00%). There are total about 11-50 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Heavy Truck Parts and Construction Machinery Parts/Filter/Turbocharger/Clutch Disc/Clutch Cover/Water Pump/Truck Chassis Parts

4. why should you buy from us not from other suppliers?
Jinan Carman International Trade Co., Ltd. is located in Jinan city, the capital of Shandong Province. Main products are heavy truck accessories, light truck parts, engineering machinery parts and so on. We have perfect service system.