Flowtech Valves is one of the Chinese leading manufacturers of high-integrity, positive shutoff DBB&DIB valves which serve the following markets:pipeline, liquid bulk terminals,aviation fueling,refining, oil/gas production and custody transfer for the petroleum and oil and gas industries.

The age-old"DBB&DIB"system(as shown above)required the use of two valves and a spool piece.A bleed valve was used to drain the spool and verify seal integrity

Introduced in 2001,Expanding Plug Valves, were the first to meet the rigid requirements of DBB&DIB service-more than 10 years ago.In the years since,subtle yet significant design refinements have been made to improve the valve's performance. Superior design innovations, pride in manufacturing workmanship and the selection of the best materials, support Flowtech Valves'commitment to excellence and complete customer satisfaction.

The Expanding Plug Valves replaces this antiquated two-valve system with just one double seated bubble-tight valve.The upstream and downstream seal provide the same function as the two block valves.The body(serving as a spool piece)bleed verifies seal integrity.

Scored seating segments Seal abrasion is inherent in the design of most ball and gate valves.In most instances,the seats are ground or wedged against metal every time the valve cycles. Any foreign material lodged between the seats and ball or gate will score the seating surfaces.Once the seating segment is scored, product loss and contamination Valves avoids abrasion by having both independent slips totally retracted from the body bore during cycling.

Problems With Other Valves

In meter block service,the differential pressure across each closed valve is very low.There is no assistance from the line pressure to "energize"or compress floating seals to make them hold tight.Unless the body cavity in a ball valve is vented,the seals typically rely on springs to press them against the ball.The ball valve may be leaking until the user opens the bleed.Then the reduction of the body pressure introduces a hydraulic force on the seat that may stop the leak.The user can form a false impression that the ball valve is holding tight,when in reality,it leaks.In contrast,the mechanical wedge-action of the Bi-directional Sealing Expanding Plug Valves plug compresses both the upstream and the downstream seals firmly against the valve body,needing no help from the line pressure. Bi-directional Sealing Expanding Plug Valves valves hold with consistent zero-leakage.

Multi-Product Manifolds

The Bi-directional Sealing Expanding Plug Valve, having positive shut-off,Double Block and Bleed,Double Isolation and Bleed functions,was developed for multi-products fuel manifolds.Busy manifolds must be operated frequently,switching from product to product,often with power actuators and sometimes without human supervision. Valves that can be trusted to seal drop-tight every time will avoid the expensive consequences of contaminated fuel.Liquid fuels that move through pipeline manifolds are reliably segregated by provable,zero-leakage, Bi-directional Sealing Expanding Plug Valves.Every Bi-directional Sealing Expanding Plug valve in the manifold has assured Double Block and Bleed,Double Isolation and Bleed shut-off that proves total isolation of each product.By using Bi-directional Sealing Expanding Plug Valves,gasoline,diesel,kerosene,jet fuel,heating oil and LPG as well as crude oil and natural gas are protected from contamination.

Meter Stations

Flow meters require calibration to verify their accuracy.During meter calibration (proving),every closed valve in the meter system must seal drop tight.Even a small leak will cause errors in the metercalibration.The incorrect meter factor will persist until the next proving operation and incorrect flow measurement can cost huge sums of money!Every Bi-directional Sealing Expanding Plug valve in the meter station can be quickly and easily shown to be holding leak-tight.That means correct calibration...every time.

Tank Storage lsolation

Fuel in storage tanks is exposed to the risk of contamination and loss of volume unless the tank isolation valves can be checked for zero leakage.Tank side valves are operated frequently,but assuring tank integrity without Bi-directional Sealing Expanding Plug Valves can be troublesome and expensive.Using line blinds(or“skillet plates”)for segregation involves a long,costly and perhaps hazardous operation of drain-down,lock-out and tag-out.Traditional gate valve Double Block & Bleed willproduce constant loss of fuel from the open bleed.Bi-directional Sealing Expanding Plug Valves offer simple,provable,tank-side isolation and they give absolute assurance of valve integrity.

Hydrant Isolation

Fuel hydrants at busy airports must be regularly pressure tested to check the integrity of the pipes,flanges and gaskets.But the only time this inspection can be performed is in the few hours each night when the airport is closed. On some occasions, sections of the hydrant must be isolated for extension, modification or repair.Or,it may become necessary to isolate, section by section,to fnd the location of a leak.Airports don't have the time to drain fuel from the lines or to swing line blinds for traditional line block,but the entire hydrant must be isolated and pressurized to prove that it is safe.

Bi-directional Sealing Expanding Plug Valves are the recognized Hydrant Valves for airport service because:
·They close quickly and easily.
·They require very little maintenance.
·They hold with zero-leakage.
The hydrant pressure-test can begin as soon as the valves are closed,since the Bi-directional Sealing Expanding Plug Valves show that the hydrant is totally isolated.
Countless loading facilities depend on Bi-directional Sealing Expanding Plug Valves for safe,reliable,zero-leakage shut-off at rail,truck and shipload manifolds.From Alaska to Argentina;from Sidney to Sicily;from New York to New Zealand,fuel movement managers have
discovered Bi-directional Sealing Expanding Plug Valves are the only valves they can trust to deliver real dependability at their loading

The nternal design is very simple.Seals
(A)a re permanently bonded into the slips
(B)which are mounted on a central plug.
In the open position the slip seals are completely out of the flow

The nternal design is very simple.Seals
(A)a re permanently bonded into the slips
(B)which are mounted on a central plug.
In the open position the slip seals are completely out of the flow

When the operator is turned further clockwise,the tapered plug begins to lower,forcing the slips against the body initiating the verifiable seal.
Because the seals never drag,the valve requires less torque to cycle.

In the closed position,the slip seals are expanded, compressing the slip seals until metal-to-metal seating is effected. Because it is mechanica, the expanding sealing doesn't rely on line pressure differential to help make its seal.It even seals in vacuum service.

Simple, in-line field maintenance keeps costs down
A big advantage of Bi-directional Sealing Expanding Plug Valve's design is that it permits“in-line”servicing.By simply removing the valve bonnet or lower plate (after the line is depressurized and drained),all models may be repaired from top or bottom without removing the valve from the line.