National JWS-165 Mud Pump Parts: Suction and Discharge Valve-Service References

For a National JWS-165 mud pump parts enquiry, the complete component reference is more useful than the pump model alone. The Mud King Products catalogue separates expendable parts by nominal size, component family and installed arrangement. This guide transcribes the identifiable supplier-number entries associated with National JWS-165, with their original page and table context, so a buyer can assemble a clearer maintenance RFQ.

Suction and Discharge Valve-Service References

JWS165 and JWS340 share an expendables sheet, but the gasket box gives a separate model entry. For JWS165 it lists MK-2410031-429; the JWS340 gasket is not substituted in this guide. The liner table shows MK-0240-series liners from 3 to 4½ inches with packing MK-1712064.

The MKP-G2 valve table separates suction and discharge positions. It lists MK-1561571 for the suction seat and MK-1561572 for the discharge seat; the spring references are also different. This is why a request for one generic valve-seat set is incomplete. One 4-inch rubber-kit cell is retained as an unresolved source-size issue rather than silently corrected or presented as a confirmed fit.

Read the catalogue reference correctly

The accompanying reference list covers the identifiable number-bearing cells in the relevant source tables, not a complete original-manufacturer bill of materials. MK and MKG identify supplier catalogue references; their prefixes, punctuation and combined suffixes are retained. A value marked N/A or left blank is not replaced by an invented number. A shared model heading records the catalogue scope and does not by itself confirm interchangeability on an individual pump.

Information to send for parts matching

Send the pump nameplate and serial number, full reference including its prefix, required quantity and a photograph of the installed or removed component. For liners and pistons, add the nominal size and sealing arrangement. For fluid-end hardware, identify the module configuration and whether an individual component or a studded assembly is required. Keep any original equipment drawing number as a separate field rather than stripping the supplier prefix to assume an OEM match.

Review mud pump spare parts matching, compare liners, pistons, valves and seats, or send Pratt Oil a parts list for review. Matching and availability require confirmation; these references do not establish authorisation, inventory or a delivery promise.