Diaphragm Pneumatic Series

The Valveworks USA Diaphragm Pneumatic Series consists of a lineup of actuators with reliable, proven designs that are engineered and manufactured to meet the requirements of API 6A. The Diaphragm Pneumatic Actuation allows for pneumatic powered operation to open and close the gate valve. This series of actuators offers the user several options depending on the specific gate valve size and pressure.

Diaphragm Pneumatic Actuators are similar to each other in design with only slight variations across the lineup, offering a high percentage of parts interchangeability, giving you an efficiency-driven advantage in the management and maintenance of your actuator fleet, and providing optimal life cycle management integrity.

This brochure provides an in-depth look at the details of this series of actuators and explains the features, benefits, characteristics, dimensional & technical data, and other valuable information needed to determine which actuator provides an optimal solution for your specific application.


100 Series 120 Series 150 Series 200 Series
Available valve bore sizes
& rated working
pressures (psi)
2 1/16” 2/5K 2 1/16” 2/5K
2 9/16” 2/5K
3 1/8” 2K
1 13/16” 10K
2 1/16” 10K
3 1/8” 3/5K
4 1/16” 2/5K
2 9/16” 15K
3 1/8” 10K
4 1/16” 15K
5 1/8” 5K
7 1/16” 2/3K
Maximum operating pressure (psi) 150 150 150 150
Available PR(a) 1 1 1 1
Material classes AA AA AA AA
Stem type Rising Rising Rising Rising
Stem packing type Opti-seal Opti-seal Opti-seal Opti-seal
Repacking YES(b) YES(b) YES(b) YES(b)
Temperature range -20°F (-29°C) THRU 180°F (82°C) -20°F (-29°C) THRU 180°F (82°C) -20°F (-29°C) THRU 180°F (82°C) -20°F (-29°C) THRU 180°F (82°C)

a) Performance Requirement.
b) Repacking is achieved via stem backseat method.


Temperature Classification Operating Range
P -20°F (-29°C) TO 180°F (82°C)
S 0°F (-18°C) TO 140°F (60°C)
T 0°F (-18°C) TO 180°F (82°C)


Minimum Material Requirements
Material Class Body, Bonnet end & outlet
parts & stems
AA General service Carbon or Low-alloy steel Carbon or Low-alloy steel


Series Height (A) Diameter (D)
100 13 3/4 12 7/8
120 15 1/2 15 1/8
150 17 1/4 18 3/8
200 22 1/4 23 1/2

The dimensions B, C, and E vary for different series of Double Acting Hydraulic Actuators and different valve sizes chosen to accompany them.

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