Flexible Wedge Gate Valve

  • Standards:
  • Design and Manufacture: ANSIB16.34, API600 API6D, API603,BS1414
  • Face to face(end to end): ANSIB16.10, API6D
  • Flange connection: 2″~24″to ANSIB16.5,
  • 26″~36″to MSS-SP-44 to API605 on Request
  • Test and inspection: API598,API6D
  • Butt welded end: ANSIB16.5
Category:

Description

The flexible wedge is a one-piece solid disk with a cut around the perimeter. These cuts vary in size, shape, and depth. A shallow, narrow cut on wedge perimeter gives less flexibility but retains strength. A cast-in recess or deeper and wider cut on wedge perimeter gives more flexibility but compromises the strength.

This design improves seat alignment and offers better leak tightness. It also improved performance in situations where thermal binding possible. Flexible wedges Gate valves are used in steam systems.

Thermal expansion of steam line sometime causes distortion of valve bodies which may lead to thermal blinding. The flexible gate allows the gate to flex as the valve seat compresses due to thermal expansion of steam pipeline and prevent thermal blinding.

The disadvantage of flexible gates is that line fluid tends to collect in the disk. These may result in corrosion and ultimately weaken the disk.

Material

Body ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB
Bonnet ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB
Wedge ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB
Stem ASTM A 276 410 / A 276 304 / A 276 304L / A 276 316L
Seat Rings ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB
Back Seat Bushing ASTM A 276 410 / A 276 304 / A 276 304L / A 276 316L
Gland ASTM A 276 410 / A 276 304 / A 276 304L / A 276 316L
Gland Flange Carbon Steel / Stainless Steel
Stem Nut ASTM A 439 Gr.D2 / Al. Bronze
Lock Nut Carbon Steel / SS 304
Gland Packing Graphite Asbestos / Graphoil / PTFE
Bonnet Gasket Corrugated Soft Iron / Corrugated SS / Spiral Wound SS 304 with Asbestos or Graphoil / Octagonal Ring
Gland Eye – Bolt & Nut Carbon Steel / Stainless Steel
Cross Bolts & Nuts Carbon Steel / Stainless Steel
Hand Wheel Carbon Steel
Hand Wheel Nut Carbon Steel
Grease Nipple Carbon Steel
Grub Screw Carbon Steel
Studs / Bolts ASTM A 193 B7 / A 193 B7M / A 193 BBM / A 320 L7
Nut ASTM A 194 2H / A 194 8 / A 194 8M / A 194 4 / 7
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