The advantages and disadvantages of the fixed ball valve

Advantage
1, double block and emission features: the fixed ball valve seat by spring preload variable, whether the valve is fully open or fully closed state, on the downstream side of the seat so that the fluid is blocked, the body cavity retentate through the discharge valve discharge.
2, automatic pressure relief feature: the Instrument needle valve body cavity retention medium caused by temperature rise when an abnormal pressure, without going through the safety valve, and the valve seat can only function of pressure relief automatically, which ensure that the safety valve in the delivery of liquid medium is very important.
3, fire safety structure: fire safety valve functions are available, the design, manufacture were to follow API 607 and API 6FA specifications.
Disadvantages
1, sealing grease emergency ambulance: as the foreign media or the fire caused the valve seat sealing failure, Instrument needle valve grease and grease gun provides a fast connection, import pump conveniently and quickly injected into the valve seat seal grease sealing parts, ease leak.
2, reliable stem sealing and low operating torque: in addition to setting the standard sealing ring, the packing gland has also set up O type sealing ring, double seals to ensure the reliability of the valve stem seals; addition of graphite filler and seal fat into the fire so that the valve stem leakage to a minimum. Stem bearings and thrust bearings so that the valve is easy to operate.
3, full size or reduced diameter: according to the selection of full size or necking structure needs. Full bore valve flow aperture consistent with the pipeline diameter, for pipeline cleaning.
4, the stem can be extended: according to the requirement of the installation or operation, the valve stem can be lengthened. Extension rod ball, especially suitable for urban gas pipeline laying occasions need buried. Long stem size according to customer needs to be determined.
5, the operation is flexible: the use of a small friction coefficient and good self lubrication of the valve seat and stem bearing, greatly reducing the valve operating torque. Therefore, even if not provided in the case of grease, but also the long-term flexibly operate on valve.

The advantages and disadvantages of the fixed ball valve:

Advantage
1, double block and emission features: the fixed ball Instrumentation ball valve seat by spring preload variable, whether the valve is fully open or fully closed state, on the downstream side of the seat so that the fluid is blocked, the body cavity retentate through the discharge valve discharge.
2, automatic pressure relief feature: the Needle valves body cavity retention medium caused by temperature rise when an abnormal pressure, without going through the safety valve, and the valve seat can only function of pressure relief automatically, which ensure that the safety valve in the delivery of liquid medium is very important.
3, fire safety structure: fire safety valve functions are available, the design, manufacture were to follow API 607 and API 6FA specifications.
Disadvantages
1, sealing grease emergency ambulance: as the foreign media or the fire caused the valve seat sealing failure, valve grease and grease gun provides a fast connection, import pump conveniently and quickly injected into the valve seat seal grease sealing parts, ease leak.
2, reliable stem sealing and low operating torque: in addition to setting the standard sealing ring, the packing gland has also set up O type sealing ring, double seals to ensure the reliability of the valve stem seals; addition of graphite filler and seal fat into the fire so that the valve stem leakage to a minimum. Stem bearings and thrust bearings so that the valve is easy to operate.
3, full size or reduced diameter: according to the selection of full size or necking structure needs. Full bore valve flow aperture consistent with the pipeline diameter, for pipeline cleaning.
4, the stem can be extended: according to the requirement of the installation or operation, the valve stem can be lengthened. Extension rod ball, especially suitable for urban gas pipeline laying occasions need buried. Long stem size according to customer needs to be determined.
5, the operation is flexible: the use of a small friction coefficient and good self lubrication of the valve seat and stem bearing, greatly reducing the valve operating torque. Therefore, even if not provided in the case of grease, but also the long-term flexibly operate on valve.

Stainless steel needle selection principles

1 , the pipeline system and cryogenic medium , should use plus low bonnet needle valve .
2 , the pipeline system FCCU refinery unit , optional needle valve lift rod .
3 , fixtures and piping systems , such as acid-base chemical systems in corrosive media , should use austenitic stainless steel , Teflon seat ring in  Stainless steel needle valve  .
4 , metallurgical systems, piping systems or devices on the power system , petrochemical plants , urban heating systems in high-temperature medium , the choice of metal to metal seal needle valve .
5, the need for flow regulation , the choice of the worm gear , pneumatic or electric adjustment with a V -shaped opening needle valve .
6 , transmission mains oil, natural gas , it is necessary to clean the pipeline , buried in the ground and the need , use full bore , all-welded construction needle valve ; buried in the ground , choose full bore welded or flanged connections the ball valve.
7 , pipelines and storage facilities for refined oil products , the choice of needle valve flange connection .
8 , city gas and natural gas pipeline , the choice of the needle valve flange and the threaded connection .
9 , metallurgical oxygen pipeline system , should use rigorous degreasing treatment , needle valve flange connection .

37° flared tube fittings typical applications

37° flared tube fittings typical applications: hydraulic service, instrumentation and chemical processing. Highly recommended for high pressure and high vibration applications.
1,Connect many varieties of tubing without flaring.
2,tubing fittings come assembled with tube nuts and ferrules.
3,Fittings and tube nuts are type 316 stainless steel. Tube sleeves are 17-4PH stainless.
4,Flareless compression fittings also available in carbon steel.
5,Use with aluminum, hard or half-hard copper, steel, stainless steel, monel, titanium and heavy wall tubing that cannot be flared.

Pipe valves may be used both with gases and liquids.

Pipe valves with metal to metal seats have a high level of safety and reliability under adverse operating conditions. These valves may be used both with gases and liquids. Traceability is ensured through extensively documented data (batch number, maximum pressure, material number, type designation). All pipe valves come with female national pipe threads. These are high pressure pipe fittings for high pressures.
These check valves are not to be used as a relief device. The opening pressure of the pipe ball check valves is approximately 10 psi. Connection type on these is high pressure NPT fittings and connections.

FD-LOK’s high pressure pipe fittings

FD-LOK’s high pressure pipe fittings are designed for process control connections between pipe sizes. Engineered specifically for high pressure applications.
An extensive choice of configurations includes:
• male and female elbows and tees
• female cross and hex couplers
• standard and long male hex nipples
• reducing bushes
• male/female adaptors
• pipe caps
As standard, all FD-LOK high pressure pipe fittings are manufactured from stainless steel. Other materials are available to special order. The stainless steel fitting are packaged in sealed boxes to ensure cleanliness.