DFPD-40-RP-90-RD-F0507 Festo Quarter Turn Actuator

Technical Overview

The DFPD-40-RP-90-RD-F0507 is a Festo pneumatic quarter-turn actuator utilizing a rack and pinion design for robust double-acting operation. Engineered for process valve automation, it delivers a constant 38.3 Nm torque through its 90-degree swivel range. This actuator is constructed with an anodized aluminum housing and high-alloy stainless steel components, meeting rigorous standards for explosive environments (ATEX/UKEX) and high-reliability safety systems (SIL 2/3).

Key Features

Double-acting rack and pinion design
F0507 flange hole pattern conforming to ISO 5211
Standard 90-degree swivel angle with +/- 5-degree adjustment
NAMUR-compliant valve connection (VDI/VDE 3845)
ATEX and UKEX certified for hazardous gas and dust zones
High-alloy stainless steel cam and screws for corrosion resistance
Optional mounting position for system flexibility
Right-hand closing direction

Technical Specification Matrix

Parameter	Value
Size of valve actuator	40
Flange hole pattern	F0507
Swivel angle	90 deg
End-position adjustment range at 0°	-5 deg ... 5 deg
End-position adjustment range at nominal swivel angle	-5 deg ... 5 deg
Shaft connection depth	16 mm
Fitting connection conforms to standard	ISO 5211
Mounting position	optional
Mode of operation	Double-acting
Design	Rack and pinion
Closing direction	Closes to the right
Symbol	00991265
Valve connection conforms to standard	VDI/VDE 3845 (NAMUR)
Connection point for positioner and position sensor conforms to standard	VDI/VDE 3845 size AA 1
Device type according to VDMA 66413	Safety device
Safety Integrity Level (SIL)	To SIL 2 Low Demand mode, Up to SIL 3 in a redundant architecture, Up to SIL 1 high demand mode
Burst pressure	24 bar
Operating pressure	0.2 MPa ... 0.8 MPa (2 bar ... 8 bar / 29 psi ... 116 psi)
Nominal operating pressure	0.55 MPa (5.5 bar / 79.75 psi)
ATEX category gas	II 2G
ATEX category dust	II 2D
Explosion ignition protection type for gas	Ex h IIC T4 Gb X
Explosion ignition protection type for dust	Ex h IIIC T105°C Db X
Explosion ambient temperature	-20 °C <= Ta <= +80 °C
Operating medium	Compressed air to ISO 8573-1:2010 [7:4:4]
LABS (PWIS) conformity	VDMA24364-B1/B2-L
Ambient temperature	-20 °C ... 80 °C
Torque at nominal operating pressure and 0° swivel angle	38.3 Nm
Torque at nominal operating pressure and 90° swivel angle	38.3 Nm
Air consumption at 0.6 MPa (6 bar, 87 psi) per cycle	3.4 l
Product weight	1882 g
Shaft connection	T14
Pneumatic connection	G1/8
Material housing	Anodised aluminium
Material cover	Coated die-cast aluminium
Material seals	NBR
Material shaft	Nickel-plated steel
Material cam	High-alloy stainless steel
Material screws	High-alloy stainless steel

Industrial Applications

1. Explosion-Proof Valve Actuation in Petrochemical Refineries

Utilizing the Festo DFPD-40 quarter-turn actuator to drive process ball valves in hazardous zones for volatile chemical routing. Its intrinsic mechanical explosion protection ensures safe operation in environments with explosive gases or dust.

Problem Solved

Standard electrical or unprotected pneumatic actuators pose an ignition risk in ATEX Zone 1/21 environments. This actuator eliminates the ignition risk while providing reliable SIL 2 (up to SIL 3 in redundant architectures) safety integration for low-demand emergency shutdown or critical flow control.

ATEX II 2G/DEx h IIC T4 Gb XSIL 238.3 Nm torqueDouble-acting

2. High-Precision Dosing in Fine Chemical Batch Manufacturing

Deploying the actuator on butterfly or ball valves for controlling the precise flow of fine chemicals. The actuator is paired with a precision positioner or sensor box via the standard VDI/VDE 3845 NAMUR interface for exact flow modulation and monitoring.

Problem Solved

Process plants require highly reliable, contamination-free operation. The LABS (PWIS) conformity prevents the introduction of paint-wetting impairment substances, while the rack and pinion design provides a consistent 38.3 Nm torque across the entire 90-degree swivel for accurate, repeatable dosing.

LABS (PWIS) conformityVDI/VDE 3845 (NAMUR)Rack and pinionISO 5211End-position adjustment

3. Corrosive Media Isolation in Wastewater Treatment Plants

Actuating chemical isolation valves for dosing lines in municipal or industrial wastewater treatment facilities. The robust material construction ensures long-lasting actuation of diverter valves outdoors or in constantly damp environments.

Problem Solved

Corrosive and harsh wastewater environments quickly degrade standard mild steel actuators, leading to valve seizure and maintenance downtime. The anodized aluminum housing, nickel-plated steel shaft, and high-alloy stainless steel cams and screws resist corrosion while operating reliably on standard 0.55 MPa (5.5 bar) plant air.

Anodised aluminium housingHigh-alloy stainless steelNickel-plated steel shaft0.55 MPa nominal pressureNBR seals