Safety Valve

The Pressure Safety Valve is a valve mechanism for the automatic release of a gas from a boiler, Pressure Vessel, or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named Pressure Safety Valves (PSV) or Pressure Relief Valves (PRV). The other parts of the set are named Relief Valves, safety relief valves, pilot-operated safety relief valves, low pressure safety valves, vacuum pressure safety valves.

Pressure Relief Valves were first used on steam boilers during the industrial revolution. Early boilers without them were prone to accidental Explosion.

Pressure safety Valves also evolved to protect equipment such as pressure vessel (fired or not) and heat exchangers. Safety valveterm should be limited to compressible fluid application (gas, vapor, steam).

The two general types of protection encountered in industry are thermal protection and flow protection. For liquid-packed vessels, thermal relief valves are generally characterized by the relatively small size of the safety valve necessary to provide protection from excess pressure caused by thermal expansion. In this case a small valve is adequate because most liquids are nearly incompressible, and so a relatively small amount of fluid discharged through the relief valve will produce a substantial reduction in pressure.

Flow protection is characterized by safety valves that are considerably larger than those mounted in thermal protection. They are generally sized for use in situations where significant quantities of gas or high volumes of liquid must be quickly discharged in order to protect the integrity of the vessel or pipeline. This protection can alternatively be achieved by installing a High Integrity Pressure Protection System (HIPPS)

We can offer a broad line of Safety Valves covering Relief Valve (RV), Safety Valve (SV), Safety Relief Valve (SRV), Pilot-operated Safety Relief Valve (POSRV), Low Pressure Safety Valve (LPSV), Vacuum Pressure Safety Valve (VPSV), Low and Vacuum Pressure Safety Valve (LVPSV).

Butterfly Valve

The Butterfly Valve, one type of which may be used in a variety of systems aboard ship.
These valves can be used effectively in freshwater, saltwater, lube oil, and chill water systems aboard ship. The butterfly valve is light in weight, relatively small, relatively quick-acting, provides positive shut-off, which can be used for throttling.
A Resilient Seated butterfly valve has a body, a resilient seat, a butterfly disk, a stem, packing, a notched positioning plate, and a handle or gear. The resilient seat is under compression when it is mounted in the valve body, thus making a seal around the periphery of the disk both upper and lower points where the stem passes through the seat. Packing is provided forming a positive seal around the stem for added protection in case the seal formed by the seat could become damaged.
To close or open a butterfly valve, turn the handle only one quarter turn to rotate the disk 90 degrees. Some larger butterfly valves may have a handwheel that operates through a gearing arrangement to operate the valve. This method is used especially where space limitation prevents of a long Lever.

Butterfly valves are relatively easy to maintain. The resilient seat is held in place by mechanical means, and neither bonding nor cementing is necessary, because the seat is replaceable, the valve seat does not require lapping, grinding, or machine work.

We can Supply a wide range of Butterfly Valves covering Resilient Seated Butterfly Valve and Metal Seated Butterfly Valve: Wafer Lug Type Butterfly Valve, Double Flanged Butterfly Valve, Eccentric Butterfly Valve, Ventilation Butterfly Valve, Flexible Butterfly Valve, High Performance Butterfly Valve, Muti-layer Butterfly Valve, Butt-welded Butterfly Valve, Hydraulic Counterweight Butterfly Valve and Fully Body Lining Butterfly Valve etc.

Materials range from conventional cast Iron, ductile iron, Cast steel or forged steel to special alloy materials like Monel, Inconel, Hastelloy or Duplex steel.

All of the Butterfly Valves are designed, manufactured and tested to API, ASTM, ANSI, JIS, DIN and BS Standards.

Globe Valve

Globe valves are probably the most common valves in existence. The   globe valve derives its name from the globular shape of the valve body.   However, positive identification of a globe valve must be made   internally because other valve types may have globular appearing bodies.   Globe valve inlet and outlet openings are arranged in several ways to   suit varying requirements of flow. Common type globe valve bodies can be   a straight flow, angle-flow or cross flow type. Globe valves are used   extensively throughout the engineering plant and other parts of the ship   in a variety of systems.

We can Supply a wide range of Globe Valves covering

Universal   Globe Valves of Cast Iron Globe Valve, Ductile Iron Globe Valve, Cast   Steel Globe Valve and Forged Steel Globe Valve, Cryogenic Globe Valve,   Bellow Sealed Globe Valve, Angle Type Globe Valve, Angle Choke Valve   SDNR Globe Check Valve, Oblique Type Globe Valve and Jacketed Type Globe   Valve etc.

All of the Globe Valves are designed, manufactured and tested to API, ASTM, ANSI, JIS, DIN and BS Standards.

The advantages of ball valve

Ball valve is fixed, does not produce mobile after compression. The fixed ball valve with floating seat, after the medium pressure, mobile seat, make the seal compression on the ball, to ensure the seal. Usually mounted on the upper and lower shaft with ball bearing, the operating torque is small, suitable for high pressure and large diameter of the valve.
To reduce the number of ball valve operating torque and increase the reliability of the seal, and in recent years the oil seal ball valve, both between the sealing surface pressure note special lubricating oil, to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure, large diameter of the china check valve.
Ball valve globe is elastic. Ball and seat sealing ring is made of metal material sealing pressure ratio is large, depending on the medium itself already could not reach the requirements of sealing, pressure must be applied force. This valve is suitable for high temperature and high pressure medium.
China ball valve is on the lower end of the sphere wall open one elastic slot, and elasticity. When close the channel, sphere rolling out with stem wedge-shaped head pressure to seal with the valve seat. Wedge-shaped head before you turn the sphere are released, the sphere then restore the original prototype, appear very small clearance between the sphere and china ball valve, can reduce the sealing surface friction and operating torque.
1. The fluid resistance small, basic no full size of the ball valve flow resistance.
2. Simple structure, small volume, light weight.
3. Compact and reliable. It has two sealing surface, and the widely use of all kinds of plastic ball valve sealing surface of materials, good sealing, can realize completely sealed. Have been widely used in the vacuum system.
4. Easy to operate, open and close quickly, from open to close as soon as rotate 90 , facilitate long-distance control.
5. Easy maintenance, the ball valve has simple structure, sealing ring are generally active, removal of replacement is more convenient.
6. In the full open or full close, sphere and valve seat sealing surface and the dielectric isolation, medium through, does not cause the valve sealing surface erosion,pneumatic control valve.
7. Applicable scope wide, size from small to several millimeters, big to a few meters, from high vacuum to high pressure can be applied.
8. wipe because of ball valves in the process of opening and closing and so can be used to take in the medium of suspended solid particles.