Manual Operated Knife Gate Valve PZ73

Manual Operated Knife Gate Valve PZ73 Purpose

Mainly used for slag, bug dust, paper pulp, sewage, asphalt, grout etc. transporting pipelines in industrial, mining, environment protection, food etc. trades, acting at connecting and closing the pipeline.

Manual Operated Knife Gate Valve PZ73 Definition and Components

What is a Manual Operated Knife Gate Valve PZ73 and its main parts?

A Manual Operated Knife Gate Valve PZ73 is a type of industrial valve designed primarily for on/off isolation of fluids containing solids, slurries, powders, or viscous media. The "PZ73" is typically a model designation indicating a specific series of flanged-end, manual (handwheel operated) knife gate valves. Its key characteristic is a sharp, blade-like gate that cuts through dense or semi-solid materials to achieve shut-off.

Manual Operated Knife Gate Valve PZ73 Main Parts:

• Valve Body: The main housing, usually with flanged ends for pipe connection. Constructed to withstand abrasive wear.
• Gate/Blade: A flat, sharp-edged plate (often stainless steel with hardened edge) that moves linearly to open or close the flow path.
• Stem: A threaded, non-rising or rising stem that connects the handwheel to the gate, translating rotary motion into linear movement.
• Handwheel/Manual Actuator: The primary operating mechanism. Turning it opens or closes the valve.
• Seats/Seal Rings: Resilient elastomeric seals (e.g., EPDM, NBR, UHMWPE) mounted in the body. The gate wedges against them for a tight seal. They are often replaceable.
• Packing Box/Gland: A sealing assembly around the stem to prevent external leakage.
• Bonnet/Yoke: The structure that supports the stem and handwheel assembly.
• Flanges: Integral to the body, for bolting to pipeline flanges

Role, Characteristics, and Application Scenarios of Manual Operated Knife Gate Valve PZ73 in Pipelines

The Manual Operated Knife Gate Valve PZ73 is widely used in industrial pipeline systems to control and isolate the flow of fluids containing solids, slurry, or fibrous materials. Its main function is to provide reliable on-off control, allowing operators to safely isolate sections of a pipeline during maintenance or system adjustments.

One of the key characteristics of the PZ73 valve is its knife-edge gate design, which can cut through sludge, pulp, or particles when closing. This design prevents clogging and ensures effective sealing even in challenging working conditions. The valve also features a compact body structure and manual handwheel operation, making it easy to install, operate, and maintain while keeping operating costs low.

Because of these advantages, the PZ73 knife gate valve is commonly used in industries such as mining, wastewater treatment, pulp and paper, chemical processing, and power generation. Its ability to handle abrasive and high-density media makes it a practical and economical solution for many industrial pipeline applications.

Manual Operated Knife Gate Valve PZ73 Standards: Materials, Design, and Connections

Water supply valve Material Standards:

• Body/Bonnet: ASTM A216 WCB (Carbon Steel), ASTM A351 CF8/CF8M (Stainless Steel), or ductile iron.
• Gate: 304/316/410 Stainless Steel, often with hardened edge or coated with wear-resistant materials.
• Seats/Seals: EPDM (for water, slurries), NBR (oils), UHMWPE (abrasion resistant), Viton® (chemicals).
• Stem: 304/316 Stainless Steel.
• Handwheel: Ductile Iron or Steel.
• Design Standards: Commonly conforms to MSS SP-81 ("Knife Gate Valves - Flanged, Lug, Wafer, and Butt-welding Ends"). Design pressure/temperature ratings follow this standard.
• Connection Standards: The "PZ73" model typically denotes a flanged-end valve. Flanges conform to:
• ASME B16.5 (For Class 150 or 300 ratings, RF flange face common).
• EN 1092-1 (DIN) (For PN10/PN16/PN25 ratings).

How to Select Manual Operated Knife Gate Valve PZ73

• Define Technical Specifications: Determine the exact requirements: Pipe size (DN/NPS), pressure class (PN/Class), process fluid (type, temperature, abrasiveness, % solids), and required seat/stem packing material.
• Identify Qualified Suppliers: Source from established industrial valve manufacturers or specialized distributors with proven expertise in knife gate valves. Verify certifications like ISO 9001.
• Request Detailed Quotation: Provide your specs to suppliers. Request a formal quote including: material breakdown, detailed dimensions, torque values for operation, and certification availability (e.g., material test reports).
• Review & Order: Compare offers based on technical compliance, lead time, total cost, and warranty terms. Ensure the purchase order explicitly states the valve model (PZ73), size, pressure rating, material specifications, connection standard, and any special testing or documentation requirements.

Pre-Shipment Inspection for Export Manual Operated Knife Gate Valve PZ73 and Key Considerations

Pre-Export Inspection and Precautions

Inspection Protocol:

• Visual & Dimensional Check: Verify no physical damage, correct markings (size, pressure, material), and that flange dimensions/drilling align with the specified standard (e.g., ASME B16.5).
• Material Verification: Review supplied material certificates against purchase order requirements.
• Functional Test: Operate the handwheel through full cycles to ensure smooth, unrestricted movement with proper gate alignment.
• Pressure Test: Witness and review records for standard shell (hydrostatic) test and seat leakage test performed per API 598 or ISO 5208. This is critical for quality assurance.
• Packaging Inspection: Ensure internal protection (desiccant, anti-rust coating) and robust external packaging (wooden crate) suitable for ocean freight. The valve should be securely fastened inside.

Knife Gate Valve Precautions:

• Ship Valve Closed: The gate should be in the fully closed position to protect the sealing edges.
• Protect Critical Surfaces: Apply a rust preventive to machined surfaces (stem, flange faces). Use protective covers on flanges.
• Immobilize Moving Parts: Secure the handwheel to prevent rotation during transit.
• Complete Documentation: Ensure packing list, commercial invoice, manuals, test certificates, and material reports are placed in a waterproof bag inside the crate. Exterior must have clear shipping marks, gross weight, lifting points, and fragility/handling symbols.

Manual Operated Knife Gate Valve PZ73 Main part materials

Title of part	Material
Body/Bonnet	Carbon steel、Stainless steel
Gate	Carbon steel、Stainless steel
Stem	Stainless steel
Sealing face	Rubber.PTFE,Stainless steel. Carbide alloy

Manual Operated Knife Gate Valve PZ73 Main dimensions(mm)

DN		50	65	80	100	125	150	200	250	300	350	400	450	500	600	700	800	900
L		48	48	51	51	57	57	70	70	76	76	89	89	114	114	127	127	154
D	PN10	165	185	200	220	250	285	340	395	445	505	565	615	670	780	895	1015	1115
	PN16	165	185	200	220	250	285	340	405	460	520	580	640	715	840	910	1025	1125
	150Lb	150	180	190	230	255	280	345	405	485	535	595	635	700	815
D1	PN10	125	145	160	180	210	240	295	350	400	460	515	565	620	725	840	950	1050
	PN16	125	145	160	180	210	240	295	355	410	470	525	585	650	770	840	950	1050
	150Lb	120.7	139.7	152.4	190.5	215.9	241.3	298.5	362	431.8	476.3	539.8	577.9	635	749.3
n-Фd	PN10	4-18	8-18	8-18	8-18	8-18	8-22	8-22	12-22	12-22	16-22	16-26	20-26	20-26	20-30	24-30	24-33	28-33
	PN16	4-18	4-18	8-18	8-18	8-18	8-22	12-22	12-26	12-26	16-26	16-30	20-30	20-33	20-36	24-36	24-39	28-39
	150Lb	4-19	4-19	4-19	8-19	8-22	8-22	8-22	12-26	12-26	12-29	16-29	16-32	20-32	20-35

Note:1. Other specifications and flange standards are available upon request.

2. Design and specifications are subject to change without prior notice