Valves & Fittings

Valves & Fittings

Engineered Shapes for Safety-Critical Valves

Stainless steel valve and fitting manufacturers rely on base materials that can withstand pressure, corrosion, and long-term cyclic loading in demanding service environments. Plymouth® supplies the high-strength, corrosion-resistant cold drawn tubing and engineered shapes used to produce critical steel pipe fittings and valve components for oil and gas, power generation, chemical processing, and industrial fluid systems. Our materials are engineered for consistency and reliability, meeting applicable requirements of ASME Section III and supporting compliance with piping codes such as ASME B31 and widely adopted API valve standards, including API 526 and API 594.

Our premier stainless steel pipes and fittings are the result of decades of manufacturing experience, helping us deliver precision near-net or semi-finished shapes. Our customers use these shapes to construct valves and fittings that meet regulations for safety-critical applications with long-term performance under extreme pressure, temperature, and corrosive media. Our engineered extrusions are used in the construction of numerous valves stainless steel pipe fittings, including:

  • Ball Valves
  • Plug Valves
  • Switching Valves
  • Needle Valves
  • Crossover Valves
  • Manifold Valves
  • T-sections
  • Elbows

Engineered Shapes for Safety-Critical Valves

Stainless steel valve and fitting manufacturers rely on base materials that can withstand pressure, corrosion, and long-term cyclic loading in demanding service environments. Plymouth® supplies the high-strength, corrosion-resistant cold drawn tubing and engineered shapes used to produce critical steel pipe fittings and valve components for oil and gas, power generation, chemical processing, and industrial fluid systems. Our materials are engineered for consistency and reliability, meeting applicable requirements of ASME Section III and supporting compliance with piping codes such as ASME B31 and widely adopted API valve standards, including API 526 and API 594.

Our premier stainless steel pipes and fittings are the result of decades of manufacturing experience, helping us deliver precision near-net or semi-finished shapes. Our customers use these shapes to construct valves and fittings that meet regulations for safety-critical applications with long-term performance under extreme pressure, temperature, and corrosive media. Our engineered extrusions are used in the construction of numerous valves stainless steel pipe fittings, including:

  • Ball Valves
  • Plug Valves
  • Switching Valves
  • Needle Valves
  • Crossover Valves
  • Manifold Valves
  • T-sections
  • Elbows

Plymouth® Products used for Valves & Fittings

To meet the rigorous dimensional standards of precise flow control, Plymouth supplies the valve and fitting sector with high-strength, cold drawn shapes. Our manufacturing process reduces secondary machining, optimizes material yield, and ensures components’ sustained performance in high-pressure industrial environments. Some of these components include:

  • High-pressure valve stems
  • Complex manifold blocks
  • Precision seat rings and seals
  • Heavy-duty fitting bodies

Cold Drawn Shape Specifications

Material Specifications

Carbon & Alloys

US Grades in Series 1000, 4000, 6000, 8000, 9000 

Stainless Steel in Complex Geometries 

Series 300 & 400 Stainless Steel 

PH Grades in Rounds, Hexes or Octagons

17-4, 17-7, 15-5, 13-8 

Exotic Alloys 

Monel 400, Inconel, Hastelloy, etc.

Shape Specifications

Solid, Round

0.2500” – 3.750” OD

Hexagon and Octagons, across flats 

0.3125” – 3.625” 

Rectangles and Squares

0.625” per side min, 5.000” max 

Unique Shapes 

Greater than 0.625” 

Profile must fit within 6.500” Diameter Circle

Dimensional Specifications

Dimensional Tolerance, Standard*

+/- 0.005” 

Fillet and Radii Tolerance, Standard* 

0.015” in Carbon, 0.360” in Stainless 

Ratio of Height vs. Width

1 : 1.16 (Max.) 

Cross-Sectional Area

0.125 sq. in. (Min.)

*Tighter Tolerances may be available

Our stainless and carbon steel extrusions provide the structural integrity, dimensional control, and metallurgical quality required for downstream machining and valve assembly.

Carbon Steel Extruded Engineered Shapes

Carbon & Alloy Steel Grades 

1018 1029 1030 1035 1040

1045 1050 1060 1215 4130 

4140 4150 4340 6150 

8620 8630 8640 9310 

A36 A588 A690 Grade 50 Grade 60

Industry Specifications 

AMS S6758 AMS 6415 AMS S5000 

ASTM A 36 ASTM A 105 ASTM A 322 

ASTM A 576 ASTM A 588 ASTM A 690 

AMS-S-6758A

AMS 6382

Outside Dimensions

Shape cross-section must fit within 6” (152.4mm) diameter.

Stainless Steel Extruded Engineered Shapes

Stainless Steel Grades 

303

304 series

310

316 series 

400 series

418

422

13-8 MO

15-5 PH

17-4 PH

17-7

Industry Specifications 

AMS 5610

AMS 5613

AMS 5616

AMS 5621

AMS 5627 

AMS 5629

AMS 5639

AMS 5640

AMS 5643

AMS 5645 

AMS 5646

AMS 5648

AMS 5651

AMS 5659

AMS QQS 763

ASTM A 276

ASTM A 511

Outside Dimensions 

Shape cross-section must fit within 5.5” (139.7mm) diameter.

More than 100 Years of Innovation, Quality, and Custom Solutions