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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

Introduction and Selection of Safety Valves

The safety valve is a special valve which the opening and closing part always stay on closed state under the action of an external force. When the pressure of the medium in the equipment or the pipeline rises above a prescribed value, the medium is prevented from exceeding the specified value by discharging the medium outside the system. Safety valves are automatic valves, mainly used in boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation.

Common safety valves generally have the following types:

1. According to the overall structure and the loading structure, it can be divided into three types: heavy hammer lever type safety valve, spring type safety valve and control type.

2. According to the ratio of the valve opening height to the valve circulation diameter, it can be divided into a micro-open type and a full-open type safety valve.

3. According to the way of safety valve gas discharge, it can be divided into three types: fully enclosed, semi-closed and open.

The selection of a suitable safety valve should be considered from the following items:

1. The structural form mainly depends on the process conditions of the equipment as well as the working medium and characteristics. Generally, the spring type safety valve is often used when the amount of boiler and pressure vessel is not large. Otherwise, it is better to select the full-open safety valve.

2. If the medium is toxic, flammable and explosive, the closed safety valve should be selected.

3. Each safety valve has its own working pressure range. When selecting, it should be selected according to actual needs.

4. The discharge of the selected safety valve must be greater than the discharge amount of the equipment, so as to ensure that part of the medium is removed and the pressure is prevented from rising.

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