Packing Assembly: Temperature Range -40°C to 260°C

Component Specifications

Definition

A packing assembly is a critical sealing component in pump fluid ends (wet ends) that creates a dynamic seal around the rotating shaft or reciprocating rod to prevent fluid leakage from the pump chamber to the atmosphere. It consists of multiple packing rings compressed within a stuffing box by a gland follower, ensuring proper sealing while allowing controlled lubrication and heat dissipation.

Working Principle

The packing assembly works by compressing multiple packing rings around the pump shaft within a stuffing box. As the gland follower is tightened, the rings deform radially to create a seal against both the shaft and stuffing box walls. Controlled leakage provides lubrication and cooling, while the compression maintains sealing pressure during shaft movement and thermal expansion.

Materials

Packing rings: Braided carbon fiber, PTFE-impregnated aramid, graphite filament, or flexible graphite. Gland follower: ASTM A276 316 stainless steel. Stuffing box: ASTM A536 ductile iron or ASTM A216 WCB carbon steel. Springs: Inconel 718 or 17-7PH stainless steel.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Leakage Rate	1-5 drops per minute (controlled)
Pressure Rating	Up to 20 MPa
Temperature Range	-40°C to 260°C
Installation Torque	15-40 Nm (gland bolts)
Shaft Diameter Range	25-150 mm
Packing Ring Quantity	4-8 rings
Compression Adjustment	Threaded gland with locking nut

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 21049, API 682, DIN 24960

Parent Products

This component is used in the following industrial products

Pump Fluid End (Wet End)

The high-pressure section of a mud pump where drilling fluid is pressurized and discharged.

View Product Details

Engineering Analysis

Risks & Mitigation

Shaft scoring from overtightening
Fluid contamination from packing degradation
Excessive leakage leading to environmental hazards
Overheating due to inadequate lubrication

FMEA Triads

Trigger: Insufficient gland compression
Failure: Excessive fluid leakage
Mitigation: Follow torque specifications and monitor leakage rates during run-in period

Trigger: Chemical incompatibility
Failure: Packing material degradation and seal failure
Mitigation: Verify chemical compatibility charts and select appropriate packing materials

Trigger: Shaft misalignment
Failure: Uneven wear and premature failure
Mitigation: Ensure shaft alignment within 0.05 mm TIR and use self-aligning gland followers

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Shaft runout: ≤0.05 mm TIR, Stuffing box bore concentricity: ≤0.08 mm TIR

Test Method

Hydrostatic pressure test per API 682 Category 1, leakage measurement per ISO 21049 Annex B

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Packing Assembly

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Anhui Tianyu Petroleum Equipment Manufacturing Co., Ltd.

Xuancheng, Anhui, CN

Also makes: Pump Fluid End (Wet End), Check Valves, Gate/Flow Control and 2 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Plunger Packing Assembly”
View source page ↗ fluidendpumpparts.com · checked 2026-09-03

View profile Send enquiry

JST Seals

Guangzhou, Guangdong, CN

Also makes: Hydraulic Cylinder, Hydraulic Piston, Piston Rod & Seal and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Gate Valve Stem Packing Assembly”
View source page ↗ jst-seals.com · checked 2026-09-03

View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

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Frequently Asked Questions

How often should packing assemblies be inspected?

Inspect every 3-6 months or 2000 operating hours. Check for excessive leakage, gland follower position, and packing ring wear.

What causes premature packing failure?

Common causes include improper installation torque, misalignment, incompatible fluids, excessive shaft runout, and inadequate lubrication.

Can packing assemblies handle abrasive fluids?

Yes, with specialized materials like PTFE-impregnated aramid or carbon fiber packing rings designed for abrasive service.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Packing Assembly