STRUCTURE OF DOUBLE BLOCK & BLEED PLUG VALVE Non-Lubricated

This system is designed to relieve excess pressure rise in the body cavity of a closed valve due to ambient temperature causing expansion of the liquid in the valve. The relief valve is set to openat 25 PSI on all valves, regardless of their working pressure. With the Double Seal Valve closed, the relief valve will open at 25 PSI Above upstream pressure.This System functions only when the Double Seal valve is closed and the isolation valve is open.

*PLUG VALVE's characteristic and merits 

1. Completely no leakage.

* PLUG & Tapered pipe of the Teflon Sleeve uses the contact method giving absolutely no leakage problems compared to other Process Valves.

* Stem Seal structure has secured the security design and gives absolutely no leakage characteristic of magnet powered type.

* Weather Proof Type characteristic has been added. The steam seal parts of products of other enterprises leaks and after long usage corrosion takes place in the sealing but our product has used the sealing structure in the stem part and the covering part which gives absolutely no leakage for longtime use eventually increasing the life span of the product. (Top Seal structure)

2. No dead space in the valve

The passage ways of the valve hav no extra space like other Process valve allowing full control and open/close function, semi-permanent life span.

3. No need of maintenance and repair

Having no extra space there is no worry that the moving materials are clogged up inside the pipe. 

*   The Seal pressure made by the abrasion of the Teflon sleeve is re - controlled by the Cover of ADJ. Bolt for semi - permanent sealing.

*   Inside the Body of the port is a Metal lip with Self-Cleaning function which can control all sticky and solid materials

*   Top entry tyoe allowing maintenance in on-line status possible. Valve which doesn't need much maintenance. 

DOUBLE BLOCK & BLEED PLUG VALVE 

HOW THIS VALVE WORKS

                   1.) CLOSING 

                   The smaller sizre of Double Seal Valves are handwheel 

                   operated and large valves have enclosed wheaterproof

                   gearing, but operate in the same manner, requiring 

                   proportionately more turns. Turning the operator rotates the

                   plug 90 degrees, aligning the seating slips.

             2.) COMPRESSING

                   Turned further, the plug lowers, forcing the seals against the

                body and compressing them to fit into groves. With the slip 

                solidly against the body, a secondary metal-to-metal seat

                forms on both sides of each seal providing double protection.

                During compressing, the wedging action of the plug forces 

                    the seating slips against the valve body.   

              3.) OPENING

                  During opening, the dovetails pull the slips away from the body.

                    The plug is guided by upper trunnion and the the plug is rotated

                    90 degress, aligning the seating slips. In the open position, the

                    seals are completely out of the flow. 

 FOR MORE INFORMATION ABOUT THE PRODUCT, PLEASE CLICK LINK BELOW

DOUBLE BLOCK & BLEED VALVES