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VALVES & FITTINGS

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Brass Gate Valves Cast Iron Gate Valves Cast Steel Gate Valves Forged Steel Gate Valves Stainless Steel Gate Valves Rising Stem Gate Valves Non-rising Stem Gate Valves Double Disk Parallel Gas Gate Valves Knife Gate Valves Bellows Sealed Gate Valves

Globe Valves

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Cast Iron Globe Valves Cast Steel Globe Valves Forged Steel Globe Valves Stainless Steel Globe Valves Brass Globe Valves

Butterfly Valves

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Wafer Type Butterfly Valves Flange Type Butterfly Valves Eccentric Butterfly Valves Lug Type Butterfly Valves

Check Valves

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Cast Steel Check Valves Cast Iron Check Valves Stainless Steel Check Valves Brass Check Valves Lift Check Valves Swing Check Valves Forged Steel Check Valves

Ball Valves

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Cast Iron Ball Valves Cast Steel Ball Valves Stainless Steel Ball Valves Brass Ball Valves Fully Welded Ball Valves Electric Ball Valves Ceramic Core Ball Valves Multiport Ball Valves Rotary Valves Top Entry Ball Valves Floating Ball Valves High Pressure Ball Valves High Temperature Ball Valves V-port Ball Valves

Control Valves

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Globe Control Valves

Plug Valves

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Cast Iron Plug Valves

Regulating Valves

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Cast Iron Regulating Valves

Balance Valves

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Cast Iron Butterfly Balance Valve Cast Iron Internal Thread Globe Balance Valve Brass Balance Valve Number-lock Balance Valve

Safety Valves

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Closed Spring Loaded Full Bore Type Safety Valve Closed Spring Loaded Low Lift Type Safety Valve High Temperature And High Pressure Safety Valve Pilot Operated Safety Valve Spring Full Bore Type Safety Valve With Radiator Spring Full Bore Type With Lever Safety Valve Spring Loaded Low Lift External Thread Type Safety Valve Spring Loaded Low Lift Type Safety Valve Spring Loaded Low Lift Type With Lever Safety Valve Stainless Steel Spring Loaded Full Bore Type Safety Valve With Handle Twin Spring Type Safety Valve

Instrument Valves

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Needle Valves Other Valves

LNG Cryogenic Valves & Accessories

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LNG Filling Nozzle Cryogenic Gas Return Nozzle Cryogenic Gas Refueling Receptacle Cryogenic Gas Relief Valve Cryogenic Gas Shut-off Valve Cryogenic Gas Breakaway Coupling Cryogenic Gas Pressure Regulator Cryogenic Gas Check Valve

Pipeline Filters

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Cast Iron Filter Cast Steel Filter Stainless Steel Filter Brass Filter

Pipeline & Fittings

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Fittings

Flanges

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Blind Flange Lap Joint Flange Long Welding Neck Flange Slip-on Flange Socket Welding Flange Threaded Flange Welding Neck Flange Plate Flange Spectacle Blind Orifice Flange Tube Sheet Anchor Flange Swivel Flange Reducing Flange Loose Flange

Customization

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Two Way Distributing Valve Rotary Discharge Valve

The Main Classification And User Condition For Sealing Material Of Valves

The seal is the most important part in the valves, its main purpose is to prevent leakage. The valve sealing seat also be called sealing ring, it contact with the pipeline's medium directly and can prevent the medium's flow. Once valve using, there will be many kinds of medium fill in the pipeline, such as liquid, gas, oil and corrosive medium and etc. For example, valves used in sewage treatment plant come into contact with corrosive liquids. Different seal material used in different parts and can apply for different medium.

So, the main seal material can be divide to 2 parts, one is metallic material, the other is nonmetallic material. The nonmetallic seal material always used to pipeline with normal temperature and pressure, the metallic seal material used widely in high temperature and pressure! Below will introduce the all kinds of seal materials using condition and the common valve types simply!

1. Synthetic rubber

Synthetic rubber is better than natural rubber in oil resistance, temperature resistance and corrosion resistance. The normal using temperature for synthetic rubber is T≤150℃, for natural rubber is T≥60℃. Rubber is used to the sealing of a globe valve, a gate valve, a diaphragm valve, a butterfly valve, a check valve, a clip valve and other valves with nominal pressure PN≤1MPa.

2. The nylon

Nylon have the characteristics of low friction coefficient and good corrosion resistance. Nylon is widely used in the ball valves and globe valves with T≤90℃, PN≤32MPa.

3. Teflon

Teflon is widely used in the check valves, gate valves and ball valves with T≤232℃, PN≤6.4MPa.

4. Cast iron

Cast iron is widely used in gate valves, globe valves and plug valves with medium oil and gas and with T≤100℃, PN≤1.6MP.

5. Babbitt alloy

Babbitt alloy is used for ammonia globe valve with T=70~150℃, PN≤2.5MPa.

6. Copper alloy

The main materials for copper alloy are 6-6-3 tin bronze and 58-2-2 manganese brass.

7. Chromium stainless steel

Chromium stainless steel is usually be called as 2Cr13, 3Cr13, after modulation treatment, corrosion resistance is good. Common used in globe valves and ball valves with medium of steam, nitric acid and with T≤450℃, PN≤6.4MPa.

8. Chromium nickel titanium stainless steel is usually be called as 1Cr18Ni9ti, its corrosion resistance, erosion resistance and heat resistance is good. Suitable for globe valves and ball valves with medium of steam, nitric acid and with T≤600℃, PN≤6.4MPa.

9. The nitrided steel

Nitrided steel is usually be called as 38CrMoAI, after nitrided treatment, have good corrosion and abrasion resistance. Common used in power station gate valves with T≤540℃, PN≤10MPa.

10. The boronizing

Using the valve body or valve disc body’s material processed the sealing surface directly, then boronizing surface treatment, the wear resistance of sealing surface will be very good. Boronizing is common used in sewage valve in power station.

We should pay attention to below matters once using the valves:

1. The sealing performance of the valve should be tested to ensure its performance

2. Check the sealing surface is worn or not, and repair or replace it according to the situation.