Lug Type Manual Operated Knife Gate Valve LTPZ73

Lug Type Manual Operated Knife Gate Valve Purpose

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

Lug Type Manual Operated Knife Gate Valve Definition and Components

 What is a Lug Type Manual Operated Knife Gate Valve LTPZ73 and its main parts?

A Lug Type Manual Operated Knife Gate Valve LTPZ73 is a specific design of knife gate valve featuring a lug-style body. This design has threaded inserts (lugs) on both sides of the valve body, allowing it to be bolted directly between two pipeline flanges using a dedicated set of bolts for each flange. This permits easy installation/removal and supports the valve in a dead-end service application. It is operated manually via a handwheel or lever.

Lug Type Manual Operated Knife Gate Valve Main Parts:

• Lug Body: The valve body with protruding, threaded lugs for bolting between flanges.
• Gate/Blade: A sharp, typically stainless steel plate that cuts through media to shut off flow.
• Stem: A threaded, non-rising stem connected to the handwheel and gate.
• Handwheel/Manual Actuator: The manual operator for opening/closing the valve.
• Seats/Seal Rings: Resilient seals (e.g., EPDM, NBR) mounted in the body that the gate wedges against for tight shut-off. Often replaceable.
• Packing Box/Gland: Seals around the stem to prevent leakage to the environment.
• Bonnet/Yoke: Assembly that houses the stem and supports the handwheel.

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

 Functions, Operational Features, Usage Scenarios, and Scenario Diagram

Functions: Provides reliable on/off isolation for moderately abrasive slurries, powders, granules, and viscous fluids. The lug design is ideal for systems requiring mid-line valve removal or dead-end service.

Water Valves Operational Features:

• Manual Operation: Simple, direct control via handwheel. Requires physical effort depending on size/pressure.
• Linear Cutting Action: The sharp gate cuts through thick media to achieve closure.
• Lug Body Advantage: Allows installation using only bolts through the valve's lugs, without nuts on the valve side. This facilitates installation in tight spaces and permits the downstream side to be disconnected independently.
• Bidirectional or Unidirectional Seal: Depending on seat design, it may seal from one direction or both.

Knife Gate Valve Usage Scenarios:

• Slurry Handling (mining, wastewater sludge).
• Powder & Bulk Solid Systems (cement, fly ash).
• Pulp & Paper Stock Lines.
• General Industrial On/Off Service where full bore flow and easy maintenance are needed.

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

Material, Design, and Connection Standards

Material Standards:

• Body: ASTM A216 WCB (Carbon Steel), ASTM A351 CF8/CF8M (Stainless Steel).
• Gate: 304/316 SS, often with hardened edge.
• Seats: EPDM, NBR, UHMWPE, Viton®.
• Stem: 304/316 SS.
• Handwheel: Ductile Iron or Steel.
• Design Standards: Commonly follows MSS SP-81 ("Knife Gate Valves - Flanged, Lug, Wafer, and Butt-welding Ends"). May also reference ISO 16136.
• Connection Standards: The "Lug Type" is defined by MSS SP-81. The specific flange facing (e.g., RF, FF) and drilling pattern on the lugs typically conforms to common flange standards like:
• ASME B16.5 (For Class 150/300)
• EN 1092-1 (DIN) (For PN10/PN16)

How to Select Lug Type Manual Operated Knife Gate Valve

 How to Purchase

• Define Requirements: Specify nominal size (DN/NPS), pressure rating (PN/Class), fluid media (including abrasiveness, % solids, temperature), and required seal material. Confirm that lug-type connection is suitable for your piping layout.
• Source Suppliers: Identify reputable industrial valve manufacturers or distributors specializing in slurry/knife gate valves. Verify quality management certifications (ISO 9001).
• Request Quotation & Data: Submit your specifications. Request a detailed quote including material specifications, torque values, and a dimensional drawing. For manual valves, inquire about the required number of turns/handwheel diameter for operation.
• Evaluate & Place Order: Compare technical compliance, lead time, price, and warranty. Ensure the purchase order lists all critical specs: model (LTPZ73), size, pressure, materials, connection standard, and any special requirements.

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

Pre-Export Inspection and Precautions

Inspection Protocol:

• Visual & Dimensional: Check for damage, verify markings (size, pressure, material), and confirm lug dimensions/hole threading match the specified flange standard.
• Material & Certificate Review: Cross-check provided material test reports (MTRs) against order requirements.
• Functional Test: Operate the handwheel through full open/close cycles. Ensure smooth operation, no binding, and proper gate alignment.
• Pressure Test: Witness shell (body) and seat leakage tests per API 598 or ISO 5208 standards. This is crucial for performance validation.
• Packaging Check: Ensure valve interiors are protected (VCI bags, desiccant). Externally, valves should be securely mounted within sturdy, weather-resistant wooden crates suitable for shipping.

Precautions:

• Ship in Closed Position: Protects the sealing edges of the gate and seat.
• Protect Critical Surfaces: Coat exposed stems and flange/lug faces with anti-corrosive grease. Use protective covers on threaded lugs.
• Secure Moving Parts: Ensure the handwheel is immobilized within the crate to prevent transit damage.
• Complete Documentation: Pack manuals, test reports, packing lists, and certificates in a sealed plastic envelope inside the crate. Exterior markings must include gross weight, lifting points, and "Keep Dry" symbols.

Lug Type Manual Operated Knife Gate Valve 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

Lug Type Manual Operated Knife Gate Valve 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.