How to choose the valves in different application?

Many people have doubts about how to choose valves in different media. Here are a few situations for you:

1. If the pipeline medium is ozone, we recommend using PTFE valve seat, because the oxidation of ozone is very high, conventional EPDM and NBR are not good, and PTFE has good ozone resistance.

2.120 degrees of compressed air, it is recommended to use FKM or HEPDM valve seat

3. The pipeline medium is 70-degree hydrochloric acid with a concentration of 20%-30%. Such a medium has very high corrosion performance,

It is not acceptable to use SS304, SS316, 1.4469, 2507, 2205 for the valve disc.

At this time, the valve plate needs to be covered with PTFE, so the valve body does not need to be considered so much, and ductile iron is enough. As long as the valve plate is covered well, it will be fine. In this way, the cost will be much lower.

4.9-10 alkaline solution; 9-10 is quite strong, so the valve seat is made of PTFE.

5. If the medium is salt water, and it is aquaculture, the economical configuration:

DI body, plate DI+NYLON, shaft: SS420, seat: EPDM

(This configuration is the most economical, and the use time is relatively long)

6. If the medium is: ethylene glycol solution:

This kind of solution is quite special, it is best to use FKM or PTFE, but remember not to use NBR or EPDM in this medium; because these two materials are easily corroded by ethylene glycol. Ethylene glycol, propylene alcohol. . . . Alcohol rubber is not good, because there is an additive in the rubber, which is easy to fuse with alcohol;

So the best choice is to use FKM or PTFE, but because the current price of FKM is relatively high, you can choose PTFE valve seat

2. Medium: 30% Gypsum Slurry (gypsum slurry)

???PH: 5-6.5

3. Medium: 30% limestone Slurry (lime magma)

?????PH: 7-8

For the choice of this medium - we choose, Ductile iron body, 2507 disc, HEPDM seat

8. Desulfurization and denitrification system:????

Therefore, the recommended plate is duplex stainless steel: 2507, instead of C95400/C95800

Seat: HEPDM

?

9 Sea water desalination system

Generally, the reverse osmosis process is used.

1. First, seawater is introduced into a large reservoir for sedimentation.

When diverting seawater, the valve plate of the valve is made of aluminum bronze. If you consider the cost, you can also use the valve plate to spray halar.

2. Precipitated seawater needs to be dosed and sterilized

(1) In the dosing process, aluminum bronze valve plate or 5A valve plate can also be used, or a fully lined PTFE valve can be used

3. The treated water is fully lined with PTFE butterfly valves.

9. Sugar factory:

Generally, Mexico is rich in sugar cane - boiled into sugar

In the process of boiling, heat and purify,

(1) Heating (the temperature will increase to 170-180 degrees)

(2) Purify, filter, and generate sugar crystals

In these two processes, the valve needs to meet two requirements:

Sanitary requirements--stainless steel SS304

Requirements for temperature resistance--silicone rubber

Therefore, in the sugar factory, the valve plate uses CF8, and the valve seat uses silicone rubber;

11. The medium is: the mixed gas of hydrogen, methane, carbon dioxide and hydrogen sulfide.

For biogas mixtures:

The following configurations are possible:

Ductile iron body/CF8M disc/FKM seat/SS431 worm gear shaft/SS304 chain

Ductile iron body/2507 plate/PTFE seat/SS431 worm gear shaft/SS304 chain

Lydia Zheng?

Sales Manager

We are professional OEM manufacturer of butterfly valve, gate valve and check valve for 16 years!

WRAS/ACS/UKCA/CE/ISO9001

**************************

?Tianjin Worlds Valve Co., Ltd.

?Tel:?+86-22-65358377

?Fax:?+86-22-65358366?????????Mobile:?0086-15620102471

Web:?https://www.worldsvalve.net/????

Email: [email protected]?

???????????????????????????????????????????????

QQ:???????2142132722

WhatsApp:?0086-15620102471

Skype:?????[email protected]

Wechat:???A15620102471

Add:No.25 Fuhui Road, Beizhakou Industrial Zone, Tianjin China.