Butterfly Valves

DynaQuip 700/722 Series butterfly valves are designed to provide years of rugged durability at a competitive value. Built for HVAC, utility, commercial and general industrial applications and media, these valves offer many more years of performance over lightweight throwaway valves. This valve can be automated – see our DynaFly 70F/72F series. Please select ‘Search by Specification’ to narrow product results for a specific application.

Series Options:
  • Wafer Style (700) or Lug Style (722) Bodies
  • Available Body Material: ASTM A536 Ductile Iron
  • Available Disc Material: Ni-Coated ductile iron, Aluminum Bronze and 316 Stainless Steel
  • Available Seat Material: Buna-N, EPDM, TFE, Viton®
  • 200 PSI CWP 2-12”, 175 PSI CWP 14-24”
  • Temperature range: -40 deg F to 350 deg F (Dependent on seat material)
  • Operator: Bare Stem, Locking Handle, Gear Operator, Electric or Pneumatic Actuator (DynaFly)
Key Benefits
  • Support Shaft Seal: A bonding of elastomer to phenolic backing ring protects against distortion, a common cause of shaft leakage,
  • Wide flange-face sealing area provides a tight flange-to-valve seal and negates the need for flange gaskets.
  • Once-piece 416 Stainless Steel stem shaft ensured dependability and positive disc positioning.
  • Locating holes at bottom and top of Wafer Valve Ease Installation. Lug style valve has drilled and tapped lugs meeting ANSI 125/150 flange standards.
  • Precision Profile Disc provides bubble-tight shut-off and assures minimum torque and longer seat life
  • Set Screw stabilizes the seat to prevent movement. Positive dead-end service up to 75PSIG MAX
  • Precision Taper Pin Ensures a positive vibration proof shaft to disc connection.
  • Once-piece 416 Stainless Steel stem shaft ensured dependability and positive disc positioning.
  • Four Bushings furnish shaft support for positive shaft alignment and actuator support.
Valve Details:
Body - Lug style has drilled and tapped lugs meeting ANSI 125/150 flange standards. Wafer body has locating holes at top and bottom.

Disc – Smooth finished Disc Flats align with Seat Flats to give a highly efficient seal which helps to prevent leakage into shaft areas. Precision machined and hand polished for positive seal with contoured edges for lower operating torque plus increased seat life. Comes in ductile iron, aluminum bronze, 316 stainless steel.

Seat – The Phenolic backed seat is non-collapsible, stretch resistant, and blowout proof to provide the following advantages:
  • The movement of the elastomer against the body assures a completely dry back.
  • Wide flange=face sealing area provides a tight flange-to-valve seal without the use of gaskets
  • The controlled-torque Seat allows tight shut-off with minimum movement of the seat material to reach the closed position in the center of the seat for ease of actuation.
  • The wide sealing area around the shaft provides a positive self isolating the shaft form the media.
Top Plate Standard ISO 5211 - Accommodates all types of actuators; handles, gear operators, electric and pneumatic actuators. Square connection shaft gives positive attachment for handle or actuator.

Stem - Machined from 416 stainless steel to eliminate twisting of stem. Gives direct disc control of full or partial product flow.

Stem Bushing - Composed of Acetal, stem bushings absorb operator side thrust and help prevent side-load.

Shaft Weather Seal - Prevents environmental intrusion of elements, helps to combat side load torque.

O-Ring Seal – Provides further prevention of stem leakage. Matches seat material of EPDM or Buna-N.

Flange Seal/Seat Face - Resilient seat which provides an absolute seal to all flanges within specifications. No other gaskets required.
DynaQuip 890/892 Series butterfly valves are designed for specialized or severe service. Built for high demand applications in the food and beverage, chemical/petro chemical, processing, power and utilities, pulp/ paper markets, etc., these valves offer years of performance for a wide range of applications. This valve can be automated – contact us for details. For application and ordering information, please contact us.

Key Benefits:
  • Total Encapsulation of the Seat and Disc/Stem provides the Ultimate in Contamination-free Service
  • Wafer (899) or Lug (892) Style Bodies
  • Four Redundant Seals
  • Stem Design Prevents Blow-Out Hazard
  • Temperature range: -40 deg F to 350 deg F (Dependent on material)
  • Pressure: 100-150psi (Dependent on material)
Options:
  • Size: Available in sizes 1” through 12”
  • Body: Stainless Steel, Ductile Iron, Aluminum
  • Disc: Encapsulated and Non-Encapsulated Stainless Steel
  • Seat: All Season Nitrile (food-grade), EPDM (food-grade), Viton®, PTFE/Buna-N, PTFE/EPDM, Silicone
  • Operator: Bare Stem, Locking Handle, Gear Operator, Electric or Pneumatic Actuator (DynaFly)


Body - Lug style has drilled and tapped lugs meeting ANSI 125/150 flange standards. Two piece body allows ease of seat replacement. Lug body standard with ductile iron. Wafer body standard with ductile iron. Also available in aluminum and stainless steel.

Disc/Stem - The one-piece disc/stem is manufactured as standard in grade 255 stainless steel. Type 255 stainless has almost twice the strength of type 316 stainless steel. This eliminates shaft twisting and water hammer damage while allowing a thin disc design that increases CV ratings. Type 255 stainless provides four times the corrosion resistance as 316 stainless steel. The disc can be encapsulated with various rubber compounds and other chemically compatible materials. Undercut disc for dry powder applications are also available.

Top Plate Standard ISO 5211 – Accommodates handles, gear operators, electric and pneumatic actuators.

Seat - The seat fully encapsulates the valve body, thereby preventing corrosion of the body or contamination of the flowing product. The only wetted parts are the seat and disc. Seats are available in EPDM (food grade), black nitrile (food grade), PTFE/Buna-N, PTFE/EPDM, Silicone, and Viton®.

Stem Bushing - Composed of full strength, corrosion resistant ertalyte, stem bushings absorb operator side thrust. Top bushing comes standard in all valves, while bottom bushing comes with all valves sizes 4"-12".

Stem-Seal - A third seal ensuring leak resistance externally or internally for vacuum or pressure service. Matches seat materials: Buna-N, EPDM, or Viton®.

O-Seal - Two O-seals give a sure secondary seal as the O-seal becomes part of the body and encircles the stem before entering the seat and disc area. O-seals are also located at top and bottom of stem entry to form an absolute secondary seal. Seals are of the same material except for silicone.

Hub Seal or Primary Seal - Occurs when contact is made between the disc hub and the flat surface of the seat. Hub/seat seals prevent product from attacking stem or body.

Flange Seal - Sealing O-ring of resilient seat which provides an absolute seal to all flanges within specifications. No other gaskets required.