What Is an Ammonia Valve?

Ammonia valve is a new type of safety protection valve for dangerous goods. It combines the lifting structure of the stop valve and the principle of the check valve to prevent the medium from flowing backward. Pneumatic film actuator or floating piston actuator and regulating valve are mainly used to quickly close the entrance and exit of the storage tank at a distant place in an emergency, and play a role of personal safety protection.

Ammonia valve

Ammonia valve is a new type of safety protection valve for dangerous goods. It combines the lifting structure of the stop valve and the check valve to prevent the medium from flowing backward.

Ammonia: There are two types.

First, the ammonia valve

Ammonia valve In physical and chemical experiments, oxygen, nitrogen, hydrogen, argon and other gases are often used. This

Relative molecular mass

The density of ammonia under standard conditions is 0.7081g / L

Ammonia is very soluble in water, solubility 1: 700

Irritating odor

(1) According to different requirements, there are many specifications of ammonia pressure reducing valve. The maximum inlet pressure is mostly, and the minimum inlet pressure is not less than 2.5 times the outlet pressure. There are many specifications of outlet pressure, generally, the maximum outlet pressure is.

(2) When installing the ammonia pressure reducing valve, it should be determined whether the connection specifications are consistent with the cylinder and the joints of the system used. The ammonia gas pressure reducing valve and the cylinder are connected by a hemispherical surface, and the two are completely matched by tightening the nut. Therefore, the smoothness of the two hemispheres should be maintained during use to ensure a good airtight effect. Before installation, dust can be blown off with high-pressure gas. If necessary, materials such as polytetrafluoroethylene can be used as the gasket.

(3) ammonia

React with water

When ammonia is dissolved in water, ammonia molecules and water molecules are combined to form monohydrate ammonia (NH3 · H2O) through * hydrogen bonding. Ammonia monohydrate can be ionized into ammonium ions and hydroxide ions in a small amount, so the ammonia water is weakly alkaline and can make The phenolphthalein solution turned red. The reaction of ammonia in water can be expressed as:

Ammonia monohydrate is unstable and thermally decomposes to generate ammonia and water

Three molecules, three ions, and three equilibriums in ammonia

Molecule: NH3, NH3 · H2O, H2O;

Ions: NH4 +, OH-, H +;

Triple balance: NH3 + H2O NH3 · H2O NH4 ++ OH-

H2O H ++ OH-

Use a glass rod dipped in concentrated ammonia to check the presence of HCl and other gases;

The laboratory uses it to react with aluminum salt solution to produce aluminum hydroxide;

Prepare silver ammonia solution to test the existence of aldehyde groups in organic molecules.

(4) Reaction with acid

2NH3 + H2SO4 === (NH4) 2SO4

3NH3 + H3PO4 === (NH4) 3PO4

NH3 + CO2 + H2O === NH4HCO3

(The essence of the reaction is that the lone pair of nitrogen atoms in the ammonia molecule and the hydrogen ions with empty orbits in the solution are combined to form an ionic crystal through a coordination bond. If reacted in an aqueous solution, the ion equation is

8NH3 + 3Cl2 === N2 + 6NH4Cl

(Yellow-green fades to produce white smoke)

Reaction essence: 2NH3 + 3Cl2 === N2 + 6HCl

NH3 + HCl === NH4Cl

Total reaction formula: 8NH3 + 3Cl2 === N2 + 6NH4Cl