Product Introduction
We supply a complete line of high-quality National pump valve components, including full valve assemblies, precision valve seats, heavy-duty valve springs, wear-resistant valve inserts, positioning cages and dedicated valve pullers, covering ND series, NF series, 5710 series and 19000 series OEM-matched part numbers. Each component is processed via precision CNC machining, undergoes 100% high-pressure hydraulic performance testing and wear resistance verification, and is fabricated from oilfield-grade anti-abrasion, anti-corrosion and anti-fatigue materials. No on-site modification, grinding or secondary processing is required for installation, making these parts suitable for routine daily maintenance, scheduled preventive replacement, local component repair and full fluid end overhaul projects.
Core Functional Specifications
Every Novatech National pump valve component delivers consistent, field-proven performance under harsh operating conditions, with verified authoritative engineering indicators:
- High-Pressure Sealing & Pressure Retention: Precision-lapped valve and seat pairs achieve zero-leakage sealing at a rated working pressure up to 58MPa, completely eliminating mud backflow and pressure instability.
- Stable Reciprocating Actuation: High-fatigue valve springs ensure smooth, consistent valve opening and closing at 60-100 strokes per minute (SPM), with no sticking, jamming or delayed action.
- Extreme Abrasion Resistance: Hardened alloy sealing surfaces resist long-term scouring from sand-heavy, high-solid-content drilling mud, significantly slowing component wear and extending service intervals.
- Suction & Discharge Compatibility: Customized valve structures fit both suction and discharge ends of JWS series and standard National pumps, maintaining stable performance across varying pressure environments.
- Quick Field Serviceability: Custom-designed valve pullers streamline component disassembly and installation, drastically reducing labor time and pump downtime during repairs.
Structural Characteristics
Our National pump valve components feature a field-optimized, durable structure designed for long-term operation and simplified maintenance:
- Full Model Compatibility: Fits all N-Type, K/C, KSH, P-series and JWS National mud pumps, adapting to all factory plunger sizes and fluid end configurations.
- Integral Sealing Design: One-piece molded valve inserts and precision-finished valve seats form a tight, consistent sealing pair, with no gap leakage under sustained high pressure.
- Reinforced Load-Bearing Construction: Thickened, stress-relieved critical components resist hydraulic shock and prolonged mechanical vibration without cracking or deformation.
- Standard OEM Interface Dimensions: Direct drop-in replacement for original factory parts, simplifying inventory management and eliminating fitting errors.
- Specialized Surface Hardening: Premium heat treatment and surface hardening processes enhance impact and wear resistance on core sealing surfaces, prolonging part lifespan.
Maintenance & Care Recommendations
Follow these field-proven maintenance protocols to maximize component lifespan and pump operational stability:
- Daily Inspection: Check for external mud leakage around valve assemblies, monitor discharge pressure stability, and inspect for abnormal noise or vibration.
- Weekly Maintenance: Clear mud deposits and debris from valve seats and inserts, inspect spring tension and valve core positioning.
- Monthly Wear Assessment: Measure valve-seat wear clearance, check inserts for cracks or chips, and replace lightly worn components before failure occurs.
- Scheduled Overhaul: Replace valve inserts, springs and worn seats every 3-4 months under heavy continuous use; inspect fluid end components annually for deformation.
- Proper Storage: Store spare parts in a dry, dust-free, dark environment; coat metal components with anti-rust oil to prevent oxidation and corrosion.
We supply the following spare parts:
| N-1600, N-1300,N-900, N-1100, N-1000, H-1250 “N” Type, G-1000-C “N” Type, E-700 “N” Type | ND-8-V21ND-8-V2HC2 | ND-8-S7 | 5710-32 | ND-8-PH | |
| K-700A, K-500 (Cast), K-500 (Forged),C-250 (Forged) | ND-8-V21ND-8-V2HC2 | ND-8-S2 | 5710-32 | ND-8-PH | |
| K-380, K-280, K-180, C-150B, C-150 | ND-7-V21ND-7-V2HC2ND-7-V13 | ND-7-S1 | 5710-32 | ND-7-I | ND-7-PH |
| KSH-280, KSH-180 | ND-6-V21ND-6-V2HC2ND-6-V13 | ND-6-S6 | 5710-32 | ND-6-I | ND-6-PH |
| 14-P-200, 14-P-220 | ND-8-V21ND-8-V2HC2 | ND-8-S7 | 5710-115L | ND-8-PH | |
| 12-P-160 | ND-7-V21ND-7-V2HC2ND-7-V13 | ND-7-S12 | 5710-115L | ND-7-I | ND-7-PH |
| 10-P-130, 9-P-100, 8-P-80 | ND-6-V21ND-6-V2HC2ND-6-V13 | ND-6-S4 | 5710-115 | ND-6-I | ND-6-PH |
| 7-P-50 | ND-5-V21 | ND-5-S3 | 5710-115 | NF-5-I | ND-5-PH |
| JWS-400(Pistons Discharge) | NF-3-V44NF-3-V34# | NF-3-S10 | 5710-115 | NF-3-I | |
| JWS-400Suction | NF-3-V44NF-3-V34# | NF-3-S11 | 19000-5 | NF-3-I | |
| JWS-300LDischarge | NF-4-V74NF-4-V24# | NF-4-S18 | 5710-118 | NF-4-IA | ND-4-PH |
| JWS-165L, JWS-5L Suction | NF-4-V74NF-4-V24# | NF-4-S17 | 19000-6 | NF-4-IA | ND-4-PH |
| JWS-185, JWS-340 Discharge | NF-4-V74NF-4-V24# | NF-4-S18 | National Springs Suction & Discharge | NF-4-IA | ND-4-PH |
| JWS-185, JWS-340 Suction | NF-4-V74NF-4-V24# | NF-4-S17 | National Springs Suction & Discharge | NF-4-IA | ND-4-PH |
| JWS-400 W/Cage Valve, JWS-165LX,-300LX | |||||
| D-50 | NF-4-V74 | NF-4-S13A | 5710-06 | NF-4-IA | ND-4-PH |
Field Fault Repair Cases
Case 1: Pressure Loss Caused by Worn Valve Seat
A National N-1600 mud pump experienced sudden pressure drops and audible backflow, failing to maintain consistent drilling pressure. Field inspection revealed severe wear on the valve seat sealing surface from prolonged high-pressure mud erosion. Maintenance teams replaced the matching ND-8-S7 valve seat, and the pump quickly restored full pressure stability, eliminating backflow and resuming normal operation.
Case 2: Valve Sticking Due to Fatigued Valve Spring
A National K-700A pump showed unstable mud flow and intermittent pressure fluctuations, with valves failing to fully actuate. The issue stemmed from spring fatigue after long-term high-cycle operation. Replacing the OEM-matched ND-8-S2 valve spring and adjusting assembly clearance resolved the sticking issue, returning the pump to smooth, consistent performance.
Case 3: Suction End Leakage from Damaged Valve Insert
A National JWS-400 pump suction end developed persistent fluid leakage, gradually reducing pumping efficiency. The valve insert had cracked under repeated hydraulic shock, losing full sealing integrity. Technicians replaced the dedicated NF-3-I valve insert, thoroughly cleaned the sealing surface, and fully resolved the leakage without additional adjustments.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts fully interchangeable with original National pump components? | Yes, all Novatech National pump valve parts are machined to exact OEM dimensional and performance standards, offering 100% direct drop-in replacement for original factory parts across all listed models. |
| How do I select the correct part for JWS series suction vs discharge ends? | Match your JWS pump model, end type (suction or discharge) and plunger size to the corresponding part number in the catalog; suction and discharge valves use dedicated seat and spring specifications for optimal performance. |
| What is the typical service life of these valve components? | Under standard abrasive drilling conditions, valve seats and inserts last 950-1450 operating hours; springs are rated for over 135,000 continuous cycles, 40% longer than generic aftermarket replacement parts. |
Procurement Guidance
This Novatech National pump valve and component guide serves as a reliable, dual-purpose resource for structured spare parts procurement and on-site technical troubleshooting. Every part we supply undergoes strict dimensional verification, high-pressure performance testing and wear resistance validation, fully complying with API 7K industry standards and OEM quality benchmarks. Using these model-matched, high-quality components eliminates common operational failures caused by ill-fitting, low-grade parts—including high-pressure leakage, mud backflow, valve sticking and premature wear—directly reducing pump downtime, maintenance costs and operational disruptions.
Beyond enabling accurate, efficient spare parts procurement and eliminating ordering errors, this document provides actionable field guidance for quick fault diagnosis, safe disassembly and proper installation. It establishes clear standards for both parts selection and on-site technical problem-solving, helping users streamline maintenance workflows and protect long-term pump reliability.
