Carbon Raschig Ring for my American client

Carbon Raschig Ring for my American Client.

American Client is very great. "Sincerely, Serious, and fast". It look like same as our company, They have a sincerely communication method. and a serious payment term. A precise and fast payment.

Our company purpose:
have a sincerely and patience service to consider and deal clients requirement.  
have a serious production processes to satisfy clients requirement for long cooperation.
have a fast delivery service to make sure the clients whole benefit.

Looking forward more people introduce American business man habit.


---www.hbmetals.com
Yilia.wang-- Email: yilia@flange-valve-fittings.com
Skype: yilia.wang.metals
What's app: 008613472152047

Valve stem seals for LIP-TYPE Packings

Lip-type packing expand laterally because of the flexibility of their lips, which are forced against the restraining side walls by the fluid pressure. This mode of expansion of the packing permits the use of relatively rigid construction materials, which would not perform as well in compression packing. On the debit side, the sealing action of lip-type packing is in one direction only.

Most lip-type packing for valve stems are made of virgin or filled PTFE. However, fabric-reinforced rubber and leather are also used, mainly for hydraulic applications. Most lip-type packing for valve stems are V shaped, because they accommodate themselves conveniently in narrow packing spaces.

The rings of V-packing made of PTFE and reinforced rubber are designed to touch each other on small areas near the tips of thier lips, and large areas are separated by a gap that permits the fluid pressure to act freely on the lips. Leather V-packing ring lack the rigidity of those made of PTFE and reinforced rubber, and are therefore designed to fully support each other.

V-packing made of PTFE and reinforced rubber are commonly provided with flared lips that automatically preload the restraining lateral faces. In this case, only slight initial tightening of the packing is necessary to achieve a fluid seal. V-packing rings made of leather have straight walls and require a slightly higher axial preload. If a low packing friction is important, as in automatic control valves, the packing is frequently loaded from the bottom by a spring of predetermined strength to prevent manual overloading of the packing.  http://www.metalsin.com/technical/valve-stem-seals-lip-type-packings.html