Glyoxylic acid is a 2-oxo monocarboxylic acid that is acetic acid bearing an oxo group at the alpha carbon atom.
Dimetridazole is a drug that combats protozoan infections. It is a nitroimidazole class drug. It used to be commonly added to poultry feed.
2-Methyl-5-nitroimidazole as pharmaceutical intermediates used for the compounding of Metronidazole, IndyMac yl, etc.
Glyoxylic Acid 50%,2 - methylimidazole,2-methyl-5-nitroimidazole,Dimetridazole Chengdu Jingke Trading Co., Ltd. , https://www.jkherb.com
2. The valve is a pressure regulating-overflow combination valve. When the outlet pressure is lower than the set pressure, the pressure regulating valve acts to raise the pressure to the set pressure. When the outlet pressure is higher than the set pressure, the relief valve acts to lower the outlet pressure to the set pressure. This ensures that the outlet pressure is always stable at the required set pressure.
3. Since the valve has the characteristics of the pressure regulating valve and the relief valve at the same time, it can work instead of the pressure regulating valve and the relief valve at the same time. Compared with the pressure regulating valve and the relief valve in the pneumatic system, the system is simplified. Compact structure. At the same time, the set pressure difference between the pressure regulating valve and the relief valve is eliminated, so that the air pressure in the system can be more accurately adjusted and stabilized at the required set pressure value.
4. The valve belongs to a gas-controlled pressure-regulating overflow combined valve with outlet pressure feedback, and is in a normally closed state when there is no pilot signal input. When the compressed air of the pilot air path enters the B chamber, the valve starts to work. The output pressure is controlled by the air pressure entering the pilot port CP, and the outlet pressure is set by adjusting the pressure. The compressed air entering the control chamber B from the CP port pushes the piston upward along the spool together with the spool thereon to overcome the force of the spring 7 to compress it. When the overflow valve port (i.e., the upper end surface) of the spool 6 is completely in contact with the bottom surface of the valve cover 3, the output and the overflow passage are blocked. The piston continues to move upward, the valve core pushes the bonnet upward in the axial direction, and the spring on the bonnet is compressed, the pressure regulating valve port is opened, the input cavity is connected with the output cavity, and the compressed air of the input cavity is output through the pressure regulating port. The cavity is output through the OUT port. The compressed air of the output chamber enters the A cavity and the C cavity through two gas paths on the valve body. The pressure of the gases in the three chambers is the same.
5. When the output pressure is lower than the set value, the force on the lower side of the piston is greater than the upper side, the piston moves upward, and the bonnet 3 is pushed up, so that the pressure regulating valve port is enlarged, and the pressure regulating valve port enters the compression of the output chamber. As the flow of air increases, the pressure in the output chamber increases. When the pressure of the output chamber reaches the set value, the forces on the upper and lower sides of the piston are in equilibrium, the piston stops moving up, and the opening of the pressure regulating valve port remains unchanged. The pressure and flow rate of the compressed air output from the output port remain stable.
6. When the output pressure is higher than the set pressure, the upper side of the piston is stronger than the lower side, and the valve cover and the piston move downward together, so that the opening of the pressure regulating valve port is reduced, and the pressure regulating valve port enters the output cavity. As the flow rate of the gas decreases, the pressure of the gas in the output chamber drops. If the pressure in the output chamber is still higher than the set value at this time, the piston will continue to move downward until the pressure regulating valve port is completely closed. At this time, the force of the spring 1 on the valve cover no longer acts on the piston through the valve core, but the rubber pad on the bottom surface of the valve cover is tightly pressed against the pressure regulating valve port, and the passage between the input cavity and the output cavity is blocked. At this time, if the output pressure is equal to the set pressure value, the piston stops moving. At this time, the set pressure is the outlet pressure at the same time that the pressure regulating valve port and the overflow valve port are closed at the same time, and the valve is in a static equilibrium state.
7. If the output pressure is still higher than the set pressure value, the piston continues to move downward, and the overflow valve port, that is, the upper end surface of the valve core is separated from the bottom surface of the valve cover 3, and the output chamber communicates with the overflow chamber, and the gas in the output chamber passes through. The overflow valve port is discharged through the EX port. As the pressure in the output chamber decreases, the pressure in the C chamber also decreases, and the pressure on the lower side of the piston is higher than the upper side, so that the piston B moves upward along the axial direction of the valve core to gradually close the opening of the small relief valve port. When the output pressure reaches the set value, the overflow valve port completely conforms to the bottom surface of the valve cover, and the passage between the output chamber and the overflow chamber is blocked, and the overflow stops. At this time, the overflow valve port and the pressure regulating valve port are simultaneously closed, and the valve is in a static equilibrium state in which the gas stops flowing. Since the pressures on the upper and lower sides of the bonnet are in an equilibrium state of offsetting each other, no matter how the pressure of the intake port (IN) fluctuates, the pressure balance in the valve cannot be affected, thereby ensuring that the outlet pressure is always stable at the required The set value gives the valve a good pressure characteristic.
The characteristics and working principle of the pressure reducing valve
1. QPF-F50 pneumatic balance valve, also known as main pressure reducing valve, is used in the pneumatic circuit to adjust the pressure value of compressed air so that the set pressure value is nearly constant.
2-Methylimidazole is used as a raw material, a chemical intermediate, and as a component in the manufacture of pharmaceuticals, photographic and photothermographic chemicals, dyes and pigments, agricultural chemicals and rubber.