Brays pneumatic valve seal materials are metal and nonmetallic two kinds big. Commonly used material and its conditions of use are as follows:

1, synthetic rubber

Synthetic rubber oil resistance, heat resistance, corrosion resistance, and other comprehensive performance than the natural rubber. General synthetic rubber using temperature t acuities were 150 ℃, 60 ℃ or less t natural rubber, rubber used for nominal pressure PN acuities 1 mpa of cut-off valve, gate valve, diaphragm valve, butterfly valve, check valve, pinch valve and valve seal.

2, nylon

Nylon is small friction coefficient, corrosion resistance is good wait for a characteristic. Nylon used to 90 ℃, temperature t acuities nominal pressure PN acuities 32 mpa ball valves, globe valves, etc.

3, ptfe

Teflon used to 232 ℃, temperature t acuities nominal pressure PN acuities were 6.4 MPa of cut-off valve, gate valve, ball valve, etc.

4, cast iron

Cast iron used for temperature t acuities were 100 ℃, nominal pressure PN acuities were 1.6 MPa, gas and oil in the gate valve, globe valve, plug valve, etc.

5, babbitt

Babbitt used for temperature t - 70 ~ 150 ℃, nominal pressure PN acuities were 2.5 MPa of ammonia with cut-off valve.

6, copper alloy

Copper alloy commonly used materials have the 6-6-3 bronze and the 58-2-2 manganese brass, etc. Copper alloy good wearing resistance, suitable for temperature 200 ℃, t acuities nominal pressure PN acuities were 1.6 MPa water and steam, often used in gate valves, globe valves, check valves, plug valves, etc.

7, chromium stainless steel

Chromium stainless steel grade of commonly used two cr13, 3 cr13 after quenching and tempering, corrosion resistance performance is good. Often used in temperature 450 ℃, t acuities nominal pressure PN acuities 32 mpa water, steam and oil and other medium on the valve.

8, chromium nickel titanium stainless steel

Chromium nickel titanium stainless steel grade of commonly used for 1 cr18ni9ti, its decay resistance, resistance to erosion resistance and heat resistant performance is good. Apply to the temperature of 600 ℃, t acuities nominal pressure PN acuities were 6.4 MPa steam, nitric acid, and other media, used to stop valve, ball valve, etc.

9, nitriding steel

Nitrided steel commonly used brand is a crmoala 38, the cementation, good corrosion resistance and anti scratch resistance. Often used in temperature 540 ℃, t acuities nominal pressure PN acuities 10 mpa plant gate valves.

10, boriding

Boronizing by the body or disc ontology material direct work out sealing surface, and then boriding surface treatment, sealing surface wear-resisting performance is very good. Used in power station drain valve.