Cryogenic ball valve stem seal

In LNG operations, valves can regularly encounter temperatures below -320 F (-196 C) and pressures above 750 pounds per square inch (psi). They are also subjected to periodic variations in temperatures known as “thermal cycling,” which can result in hardware expansion as well as shrinkage and material stresses. These factors make reliable, long-term valve operation an engineering challenge.

Brand:
JST Seals
Item NO.:
FMR
Payment:
T/T
Product Origin:
China
Shipping Port:
Guangzhou
Order(MOQ):
50

Product Detail

Cryogenic ball valve stem seal

Efficient, reliable valve performance is critical to the success of any LNG/CNG operation, and seals play a central role in keeping valves up and running. But their job is made difficult by the demanding service conditions.

Sealing success factors:

To provide superior protection against leakage in cryogenic valves for LNG, seals should have:

1. Jacket material that tolerates thermal cycling

2. An energizer to compensate for shrinkage

3. Anti-extrusion lip geometry

With the right material formulation and design, they can actually provide much better sealing service than alternative technologies, such as metallic seals, elastomeric seals and packings—especially in dynamic applications. In fact, the right polymer seals can actually help engineers achieve new levels of valve performance.

Sealing at cryogenic temperatures has its own unique set of challenges. JST has a wide range of solutions for cryogenic sealing applications. Cryogenic seals require skillful design by combining the right type of material, seal configuration, and spring energizer to overcome the dimensional fluctuation of all mating parts.

The FMR series spring energized seal can work in the environment of - 196 ° low temperature and corrosive chemicals for a long time. When the system pressure is zero, the spring provides initial pre pressure. When the system pressure increases, the U-shaped cavity is filled with pressure medium to make the lip close to the cylinder wall. In this way, it ensures that the seal always has good sealing performance in the whole process of pressure change, and the spring can choose ‘U’, ‘V’ and ‘O’ types according to different service environments.

Low temperature cryogenic seals application:

Rocket propulsion Filling Systems

LNG Compressors

Cryogenic Valves Stem Seals

Cryogenic Butterfly Seat Seals

Cryogenic Transfer Pumps

LNG Fueling Systems

Petroleum

Scientific Instrumentation

Specialty Gas Manufacturing

Spring energized seal:

The FMR seal is made of a helical wound spring and a polymer jacket, which is mainly used as a Flange outer face seal.

The polymer jacket's material includes PTFE,TFM, PCTFE, etc.

The helical wound spring's material includes Stainless Steel, Elgiloy, Hast Alloy, etc.

When the pressure is more than 900LBS, an anti-extrusion ring is required;

Advantages:

1. Material compound passed API 6A FF/HH Immersion Testing;
2. Easy installation;
3. NACE approved energizers available for oil and gas use;
4. Wide range of cross-sections and diameters available,especially for the bigger cross section;
5. Good sealing performance at ultra low temperature;
6. Bi directional design works better in the high pressure application.

Working Conditions
Temperature range	Pressure	Medium
-196~121℃	150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB	LNG, Low temperature ethylene

API 6D Stem Seal selection table
Groove DWG:
Temperature Rating	JST Series	Spring	0~900（LBS)	900~2500(LBS)	G=(OD-ID)/2 Standard CS:G=(OD-ID)/2	L Value
(-196℃~121℃)	FMR	Golden Elgiloy			4.7	13
					6.1	15
					8	15.5

Hot Tags :

Sealing at cryogenic temperatures LNG cryogenic valve seals ball valve static primary seal ball valve seal replacement Ball valve seat seal ball valve replacement seals

Previous:
Elgiloy spring ball valve seals for cryogenic applications

Send A Message

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Subject : Cryogenic ball valve stem seal

Categories

New Products

Related Products

Elgiloy spring ball valve seals for cryogenic applications

The FDR seal is made of a helical wound spring and a polymer jacket, which is mainly used as a Flange external face seal.

Helical spring energized seals for oil and gas application

The FDB seal is made of a helical wound spring and a polymer jacket, It is the best choice for vacuum, gas and low-temperature flange sealing applications.

Alloy spring energized seals for medical device

The spring energized seal is widely used in medical equipment, which is generally composed of a corrosion resistant spring and a seal ring made of U-shaped filled PTFE/UPE material.

UNS UHS piston rod seal

UNS UHS is a lip-seal which can be used for both piston and rod .

MEC Metal end cap seal

JST's metal end cap seal is elastomer bonded onto 2 steel caps. This provides high level of extrusion resistance.

API6A casing head T-seals

T-seals are three piece seals with an elastomeric lip and hard plastic anti-extrusion rings, it is proved to be of long time service. The standard design will fit into an o-ring gland and can be machined or net moulded.

Oil-free Air compressor PTFE piston cup seals

Oil-free Air compressor PTFE piston cup seals extensively used for steam, oil, water, and other chemical applications.

Standard size hammer union seal

Hammer Union Seals are used in hammer union-style pipe connections to establish flow lines and prevent leakage. It is widely used in the oil & gas industry.

API 6D Ball Valve & LNG Seal

-196℃~121℃

Cryogenic ball valve stem seal