Page Number 103-091
Effective Sept 2007
Replaces July 2007
MATERIALS OF CONSTRUCTION
Models: NP1.5B, NP2F, NP2.5F,
NP3F, NP4F
Section 103
NOTE: Temperature and viscosity ratings given below apply to individual components Only. For actual
maximum temperatures and viscosities for the rated pump, see "Operating Limits" on backside.
PART NAME
STANDARD MATERIALS
AVAILABLE OPTIONS
Cylinder
1.5 3
4
Cast Iron: ASTM A48
Ductile Iron: ASTM 536, 18%
Cast Iron with SAE Drain (1.5 3 )
Ductile Iron with SAE Drain (4 )
Heads
1.5
2 , 2.5 , 3 , 4
Cast Iron: ASTM A48
Ductile Iron: ASTM 536, 18%
Jacketed Heads:
Cast Iron: ASTM A48,
3/8 NPT Connection
Ductile Iron: ASTM 536, 18%
3/4 NPT Connection
Packing Follower
1.5
2 , 2.5 , 3 , 4
Cast Iron
Ductile Iron
Bearing Covers
1.5
2 , 2.5 , 3 , 4
Cast Iron
Steel
Bearing Bushing
Metallized Carbon
Rotor & Shaft
Open Rotor
Closed Rotor (125) psi maximum
differential pressure (3" & 4" only)
Rotor
Ductile Iron: ASTM 536, 18%
Cast Iron: ASTM A48
Shaft
High Strength Steel
High Strength Steel
Relief Valve (R/V)
Cast Iron: ASTM A48
Nickel Plated Cast Iron
Relief Valve Cover
Cast Iron: ASTM A48
Ductile Iron: ASTM 536, 18%
Relief Valve Cap
1.5 , 2 , 2.5"
3 , 4
Brass: ASTM B16
Ductile Iron: ASTM 536, 18%
Relief Valve Spring
Plated Steel to 300°F (149°C)
Stainless Steel to 500°F (260°C)
R/V Spring
Ranges
1.5 , 2 , 4
2.5 , 3
51-75 psi (3.5-5.2 bar)
51-110 psi (3.5-7.6 bar)
Optional springs range from 35-200 psi
(2.4-13.8 bar) - See Parts List.
O-Rings:
Fluorocarbon (FKM) to 400°F (204°C)
PTFE to 500°F (260°C)
Gaskets: RV Cap, 1.5 , 2 , 2.5
Copper
Gaskets: RV Cap, 3 , 4
PTFE
Gaskets: NPT Flange
Composition to 500°F (260°C)
Shaft Sealing
PTFE Packing to 500°F (260°C)
Lip Seal Carbon Filled PTFE
to 500°F (260°C)
Commercial Options - See Page 2
Vanes
Duravane - Full Size with Stainless
Steel Wear Plate to 240°F (115°C);
20,000 SSU (4,250 cP) Maximum.
EC Laminate - Extra-Clearance with
Stainless Steel Wear Plate to 350°F
(176°C); 40,000 SSU (8,500 cP) Max.
(Not avail. on 1.5 models.)
EC Cast Iron - Extra-Clearance to
500°F (260°C); 500 SSU (105 cP) Min.
EC Bronze - Extra-Clearance to 500°F
(260°C); 500 SSU (105 cP) Minimum.
Push Rods
Case Hardened Steel
Gage Ports
1/4 NPT
Centipoise (cP) = centistokes (cSt) at fluid specific gravity of 1.0.
