Keystone Figure 129/139 Butterfly Valve with Powered Actuator

The Keystone Figure 129/139 Butterfly Valve with Powered Actuator, engineered by Emerson, is a high-performance resilient-seated butterfly valve designed for reliable flow isolation and control in a wide range of industrial applications. Known for its durability, compact construction, and efficient torque transmission, this valve provides exceptional performance in water treatment, HVAC, chemical processing, and general industrial service. Constructed with a robust one-piece body and a precision-molded elastomer seat, the Keystone 129/139 valve ensures tight shutoff and smooth operation, even under demanding conditions. Its centric disc design delivers excellent flow characteristics with minimal pressure drop. The addition of a powered actuator—either pneumatic or electric—provides automated control, allowing for precise remote operation and integration with advanced control systems. The Figure 129 model features a wafer-style body, while the Figure 139 version incorporates a lug-style design, offering versatility for both dead-end and bidirectional service. Both types are designed for ease of installation, low maintenance, and long-term reliability.

Technical Specification of Keystone Figure 129/139 Butterfly Valve with Powered Actuator

Material

316 Stainless Steel, 316L Stainless Steel, Aluminum Bronze, Buna-N, Carbon Steel, Cast Iron, Ductile Iron, Epdm Rubber, Monel, Stainless Steel

Operating Temperature

Standard Temperature (-40 – 250F)

Pressure Class

ASME

Seat/Seal Type

Resilient

Shutoff Class

Zero Leakage

Standards

API 609, ASME B16.34

Valve Size

NPS 10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, NPS 16 / DN 400, NPS 18 / DN 450, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 3 / DN 80, NPS 4 / DN 100, NPS 6 / DN 150, NPS 8 / DN 200

Valve Size Standard

DN, NPS

Valve Type

Butterfly

Supply pressure

Up to 8.3 bar

Temperature

`-40°C to 150°C

Type

Quarter-Turn

Feature of Keystone Figure 129/139 Butterfly Valve with Powered Actuator

• Replaceable, metal-reinforced seat, completely encapsulated by rubber, isolates the stem and body from the media and eliminates seat distortion due to high vacuum or turbulence.
• Primary stem seal, formed by preloaded contact of disc hub with flatted seat surfaces, completely isolates stem and body from the line media.
• Secondary stem seal, formed by an engineered interference fit of the stem through the seat, provides additional sealing integrity.
• Rounded, polished disc edge provides full 360 degree concentric seating, minimum flow restriction, lower seating and unseating torques and maximum seat life.
• Superior, one-piece thru-shaft design provides high-strength and positive disc control. Shaft ends are standardized for operator interchangeability.
• Self-locking disc screws allow quick and easy disassembly and provide a positive connection.
• Self-adjusting, bi-directional stem seal is suitable for full industrial vacuum and pressure, preventing external contamination of the stem area.
• Heavy-duty, corrosion-resistant top bushing absorbs actuator side thrust loads.
• Each valve is factory tested to 110 percent of specified pressure rating assures drop-tight shut-off.
• Cast-in top plate is an integral part of the body and is standardized to allow direct mounting of all Keystone actuators.

• Direct mounting to all Keystone butterfly valves and ball valves.
• Valve connection compatible with Keystone (imperial and metric) and ISO 5211.
• Double Rack and Pinion design nullifies side loads on the pinion shaft, minimizing bearing wear and extending life.
• Optimized product flow with standard mounted travel stops for valve position adjustment in open and close position (+/- 5° at each end).
• Anodized aluminium body with electrostatic powder coating (ESPC) finish provides durable protection against corrosive environments.
• Double acting and spring return versions available for cost effective and safe operation.
• Up to 12 individual springs offer flexible torque range for both ball as butterfly valves.
• Pre-compressed spring design and anti-blowout drive pinion means safe maintenance and operation.

• Direct mounting to all Keystone butterfly valves and ball valves.
• Valve connection compatible with Keystone (imperial and metric) and ISO 5211
• Double Rack and Pinion design nullifies side loads on the pinion shaft, minimizing bearing wear and extending life.
• Optimized product flow with standard mounted travel stops for valve position adjustment in open and close position (+/- 5 at each end).
• Anodized aluminum body with electrostatic powder coating (ESPC) finish provides durable protection against corrosive environments.
• Double acting and spring return versions available for cost effective and safe operation.
• Up to 12 individual springs offer flexible torque range for both ball as butterfly valves.
• Pre-compressed spring design and anti-blowout drive pinion means safe maintenance and operation.