Page 1
Bettis G-Series Spring-Return
Pneumatic Valve Actuator
Component Material List
Material List
ML.GP.01.01 Rev. 0
October 2017
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Page 3
Material List
ML.GP.01.01 Rev. 0
Table of Contents
Section 1: Major Component Material List
1.1 Typical G-Series Major Component Material List ............................................. 5
Section 2: Seal Material List
2.1 Typical G-Series Seal Material List ................................................................... 7
Section 3: Typical Coatings
3.1 Nitriding ........................................................................................................ 8
3.2 Teon lined cylinder bores.............................................................................. 8
Table of Contents
October 2017
Table of Contents
3
Page 4
Section 1: Major Component Material List
October 2017
Material List
ML.GP.01.01 Rev. 0
Section 1: Major Component Material List
1.1 Typical G-Series Major Component Material List
Figure 1 G-Series Spring-Return Pneumatic (also available in double-acting type)
Table 1. Material List
Item Description Material
1 Housing Cast Ductile Iron ASTM A536
2 Housing cover Cast Ductile Iron ASTM A536
3 Yoke & Yoke Cover Cast Ductile Iron ASTM A536
4 Yoke pin Alloy steel AISI 8620 HT
5 Guide block Cast Ductile Iron ASTM A536
Spherical washer Alloy steel, Nitrided AISI 4140 HT
6 Guide bar Alloy steel, Nitrided AISI 4140 HT
Guide bar bearing Steel/Bronze/TFE Garlock DU style
7 Extension rod Alloy steel AISI 4340 HT
8 Tension rod Alloy steel AISI 4140 HT
9 Spring cartridge weldment Steel
10 Tension Lok Alloy steel
11 O-Ring Seal Nitrile
12 Hydraulic Override Assembly Carbon steel
13 Cover Plate for Spring Can Carbon steel
14 Spring Alloy steel ASTM A304/A401
15 Extension rod retainer nut Alloy steel AISI 4140 HT
16 Travel stop screw Alloy steel, Zinc plated ASTM A193
Travel stop screw nut Alloy steel, Zinc plated ASTM A194
17 Yoke pin bearing Steel/Bronze/TFE Garlock DU style
Yoke pin thrust bearing UHMWPE plastic
Yoke/Guide block bearing UHMWPE plastic
Yoke bearing Steel/Bronze/TFE Garlock DU style
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Major Component Material List
Page 5
Material List
ML.GP.01.01 Rev. 0
Section 1: Major Component Material List
18 Position indicator thrust bearing Acetal plastic
Position indicator bearing Acetal plastic
19 Position indicator assembly Stainless steel AISI 304
20 Inner endcap Cast Ductile Iron ASTM A395
21 Piston Seal Nitrile
22 Piston Cast Ductile Iron ASTM A395
23 O-Ring Seal Nitrile
24 Split ring Alloy steel AISI 6150 HT
25 Piston rod Alloy steel, Nitrided AISI 4140 HT
26 O-Ring Seal Nitrile
27 Pipe plug Steel ASTM A105
28 Tiebar nut Alloy steel ASTM A194 2H
29 Outer endcap Cast Ductile Iron ASTM A395
30 Tiebar Alloy steel, Nitrided ASTM A193 B7
31 Cylinder Steel, TFE lined ASTM A53
32 Polypak Seal Urethane Impregnated
33 Rod bushing Acetal plastic
Spring guide Cast Ductile Iron ASTM A536
Tension rod bushing Acetal plastic
34 Rod Wiper Urethane Impregnated
October 2017
Major Component Material List
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Section 2: Seal Material List
October 2017
Section 2: Seal Material List
2.1 Typical G-Series Seal Material List
Table 2.
Description Typ e Application
Piston OD / Cylinder ID D-ring Dynamic
Piston / Tiebar T-seal Dynamic
Piston rod Polypak Dynamic
Yoke O-ring Rotary
All remaining seals O-ring Static
Material List
ML.GP.01.01 Rev. 0
6
Seal Material List
Page 7
Material List
ML.GP.01.01 Rev. 0
Section 3: Typical Coatings
3.1 Nitriding
Bettis utilizes a Nitride surface nish on many component parts instead of Chrome or
Nickel plating.
The nitrided surface is not a coating, it is an integral part of the component base material.
Because of this, it will not pitt, crack, chip or ake off and any possibility of hydrogen
embrittlement (a common problem in any plating process) is eliminated.
The Nitride surface layer is extremely hard and displays improved wear resistance when
compared with plated coatings. Dent resistance is also improved.
The Nitride surface layer has also been shown to display superior corrosion resistance to
plated coatings.
Nitride surface nishing has become very popular in the uid power industry in the past
decade replacing chrome and nickel plating in many applications.
Section 3: Typical Coatings
October 2017
Typical components - piston rods, tiebars, CBA centerbars, cylinder bores, pistons.
Typical process results in a thin surface layer of iron oxide over a second layer of porous Iron
Nitride over a third layer of non-porous Iron Nitride all fused on top of the base substrate
steel material.
3.2 Teflon lined cylinder bores
The standard coating on all Bettis pneumatic cylinder bores is Xylan, a proprietary Teon
coating.
The use of this Teon lining results in superior corrosion resistance while improving seal life
and overall actuator performance.
Typical Coatings
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