Valve Body Materials: Cast Iron, Sphero, Steel, Stainless Steel
Batu Valve manufactures valve bodies in carbon steel, stainless steel, cast iron, sphero (ductile iron) and brass. The body material is determined by the medium, the pressure and the temperature; the same valve type can be produced in different body materials.
Principal materials
Carbon steel: ASTM A105 · A216 WCB
Stainless steel: 1.4301 (AISI 304) · 1.4401 (AISI 316)
Cast iron: GG-25 (cast iron) · GGG 40.3 (sphero)
Brass: MS 58
Seat: PTFE · RPTFE · PEEK · Devlon
O-ring: Viton
Body materials
| Material | Type | Where used |
|---|---|---|
| ASTM A105 | Forged carbon steel | Body, closure, seat ring, ball (ENP coated) |
| ASTM A216 WCB | Cast carbon steel | Body, closure |
| ASTM A350 LF2 | Low temperature carbon steel | — |
| 1.4301 (AISI 304) · 1.4401 (AISI 316) | Stainless steel | Ball, stem; body in the stainless steel series |
| GG-25 | Cast iron | Water valves, strainer, check valve |
| GGG 40.3 | Sphero (ductile iron) | Water valves, natural gas valve, strainer |
| MS 58 | Brass | Thrust ring, small parts, disc check valve body |
Body material by product
| Product | Body | Pressure rating |
|---|---|---|
| Cast iron ball valve | GG-25 | PN 6 · PN 10 · PN 16 |
| Sphero ball valve | GGG 40.3 | PN 25 |
| Steel ball valve | A216 WCB | PN 16 / 40 |
| High pressure ball valve | SAE 1020 | PN 64 · PN 100 · PN 150 |
| ANSI Class ball valve | A216 WCB / A105 | Class 150 – 900 |
| Natural gas ball valve | A216 WCB or GGG 40.3 | PN 16 / 40 |
| Check valve | Steel · cast iron · brass / sphero | PN 16 – PN 40 |
| Strainer | GG-25 · GGG 40.3 · cast steel · stainless steel | PN 16 / 25 / 40 |
Natural gas and Burak type mono-block ball valves are also manufactured with a stainless steel (1.4301 – 1.4401) body.
Ball, stem and coatings
- Ball: ENP coating on A105, or stainless steel (1.4301).
- Stem: stainless steel (SS 420 / 1.4021, 1.4301); 17-4 PH.
- ENP: electroless nickel plating; used on the ball.
- TCC: tungsten carbide coating; used on the ball and seat surfaces for metal-to-metal sealing.
Seat and seal materials
| Material | Where used |
|---|---|
| PTFE | Standard seat and sealing element |
| RPTFE (glass fibre reinforced) · graphite-filled PTFE | Seat |
| PEEK · Devlon | Seat in the high pressure classes |
| Viton | O-rings |
| Graphite | Fire-safe gaskets |
Material by medium
| Medium | Effect on selection |
|---|---|
| Corrosive chemical | Stainless steel body and trim |
| Containing abrasive particles | Metal-to-metal seat; a soft seat wears |
| At temperatures PTFE cannot withstand | Metal-to-metal seat |
| Containing H₂S (sour gas) | Material in accordance with NACE MR0175 / ISO 15156 |
The compatibility of medium and material is given in the chemical compatibility chart. The chart evaluates four body materials (brass, cast iron, carbon steel, stainless steel AISI 316) and four seal materials (rigid PVC, neoprene, Viton, PTFE) for approximately 300 media. The values apply at ambient temperature.
Frequently asked questions
Both are cast irons. Batu Valve manufactures cast iron (GG-25) ball valves in PN 6, PN 10 and PN 16, and sphero (GGG 40.3) ball valves in the PN 25 pressure rating.
Yes. Natural gas and Burak type mono-block ball valves are manufactured with a stainless steel (1.4301 – 1.4401) body; the ball and stem are also stainless steel.
A stainless steel body and trim are selected. The compatibility of the medium with the material is checked against the chemical compatibility chart.
See also
Select the model, pressure, connection and size; we will prepare your quotation.