Double Block and Bleed Valve

SIO manufactures Double Block and Bleed Valves in an extensive range of designs, materials, sizes, pressure classes and end connections that are designed in accordance to ASME B16.34 and where applicable API 6D or BS EN ISO 17292. The valves are fire-safe designed and include design features to ensure electrical continuity between ball, stem and body. Cryogenic and high temperature metal seated configurations are also available. All designs are forged for improved mechanical properties, pressure retention, and quality.

Main Features

Fire-Safe Test approved

SIO Double Block & Bleed valves are designed in accrdance with API 607 & API SPEC 6FA.

Double body Gasket

All SIO Double Block & Bleed valves are equipped with two body gasket.The first body gasket is in soft material and the second in graphite(if not otherwise required), this com-bination assures the best seal characteristic in whatever corrosive service as well as giving a fire safe design.

Anti-Static Device

In order to prevent static electricity which may light the fluid, static-conduction spring is set between the stem and the ball.

Anti Blow-out Proof Stem

The stem is designed with integral T-Type shoulder to provide blow-out proof effectively.The design assures that the stem can not be blown out of the valve in the case of the pack-ing being removed while the valve is under pressure.

Controlled Stem & Stuffing box Finish

Stem and stuffing box finish machining is a key point of control. The stem is made by cold rolling and stem surface finish is controlled by Ra=0.4, which can reduce friction of stem movement and ensure the seal. The stuffing box surface is controlled within Ra=1.6 for bet-ter sealing performance.

Solid ball

The solid ball used by SIO provides straight-through flow and real full-port performance characteristics. Hollow ball or cored cavity ball are not used for SIO products.

Longevity Of life

Special consideration was devoted to the at-tainment of enhanced life and operation of our valve throughout design, development, testing and manufacturing stages.Valve designs combined with the selection of advanced materials are such that long periods of inactivity should not affect the operations of efficiency.

Low Torque output

Seat designs, stem-bearing system and stem seal arrangements ensure consistent minimal torque values.

Flow Capacity

Valve design allows for high flow capacity in liquid or gas services regardless of whetherthe media is clean or dirty. Full port valves allow for pigging and ensure maximum flow capacity.

FIELD REPARAIBLE

Simple user friendly design allows for quickand easy part replacement requiring minimal”Down Time”.

ISO FLANG EINTEGRATED

ISO 5211 mounting always integrated in thevalve as standard design.

LOCKINGD EVICE

Locking device is supplied as standard in orderto prevent unauthorized opening/closing. SIO locking device can lock the valve in eitherthe open or closed position and cannot bebreached by removing the lever.

INSPECTION,TESTING&MARKING

INSPECTION AND TESTING

Every valve is subjected on routine basis todifferent non-destructive testing, like dye pen-etrant test on butt weld ends and on all hardfaced and cladding areas.

Non-destructive test are also carried out onthe critical areas as defined by ASME B16.34.

Optional examinations like:

Radiographic

Magnetic particicles

Ultrasonic

Helium leak test

Personal performing NDT are trained and qual-ified to EN 473/ASNT-SNT-TC-1A.

Every valve is subject to a pressure test inaccordance with the standard API 598 or BS6755 Part-1. The rated pressure for the applicable pressureclass is in accordance with ASME B16.34 /EN 12516-1/2.

MARKING AND IDENTIFICATION

Each valve is identified on proper name plateand on valve body as required by MSS-SP25, ASME B16.34 Name plate carries allinformation on rating, size, valve body andtrim material, customer tags.On body, marking includes material designations (per ASTM) and heat code andof course the trade mark.

BENEFITS OF THE SIO DOUBLE BLOCK AND BLEED VALVES
  • IMPROVED SAFETY IN OPERATIONS
  • SPACE, WEIGHT, AND COST SAVINGS
  • REDUCED LEAKAGE POINTS
  • COMPACT DESIGN
  • UNINTERRUPTED FLOW FOR NEGLIGIBLE PRESSURE DROP
  • REDUCED STRESSES FROM LOADING AND VIBRATION
  • DESIGNED AND ENGINEERED ON A CASE-BY-CASE BASIS
  • REDUCED INSTALLATION AND MAINTENANCE REQUIREMENTS AND COSTS
Specifications
  • Size: From 1/2” to 3” for instrumentation field application, and 3” to 36” for piping field application.
  • Range : The available pressure range, start from class ANSI 150 Lbs to class ANSI 2.500 Lbs.

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DBB TYPE

double block and bleed ball valve

Floating Ball

Trunnion Mounted Ball

Injection & Sampling

Monoflange

Mixed Connection