Appendix A—Model Number and Identification Code for the PT-Series
(Double Shaft)
Model Number
Base X X X X X X X
Outlet flange
2 in. NPT Standard Optional N/A E
2.5 in. NPT N/A Standard N/A J
3 in. NPT N/A N/A Standard P
2 in BSPT Optional Optional N/A M
2.5 in. BSPT N/A Optional N/A N
3 in. BSPT N/A N/A Optional R
2 in. Weld Optional N/A N/A F
2.5 in. Weld N/A Optional N/A K
3 in. Weld N/A N/A Optional Q
Less flange Optional Optional Optional X
Inlet flange
2 in NPT Standard Optional N/A E
2.5 in. NPT N/A Standard N/A J
3 in. NPT N/A N/A Standard P
2 in BSPT Optional Optional N/A M
2.5 in. BSPT N/A Optional N/A N
3 in. BSPT N/A N/A Optional R
2 in. Weld Optional N/A N/A F
2.5 in. Weld N/A Optional N/A K
3 in. Weld N/A N/A Optional Q
Less flange Optional Optional Optional X
Seal seat material Cast iron Standard Standard Standard 2
Seal O-ring
material
Buna-N Optional Optional Optional A
Viton
®1
Standard Standard Standard D
Bypass valve
spring
35 – 50 psi Optional N/A N/A 4
50 – 75 psi Optional N/A N/A 1
75 – 110 psi Standard N/A N/A 2
110 – 125 psi Optional N/A N/A 3
50 – 110 psi N/A Standard Standard 2
110 – 125 psi N/A Optional Optional 3
Internal bypass
valve
Bypass valve Standard Standard Standard S
Air operated valve Optional Optional Optional A
Strainer
No strainer Standard Standard Standard N
Strainer Optional Optional Optional S
Base model number
(with hydraulic drive option)
PTH20 PTH25 PTH30
Base model number PT20 PT25 PT30
Specifications
1
Viton
®
is a registered trademark of the DuPont company.
N/A = Not Applicable
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