Size Range NPS 2 to 12 / DN 50 to 300 90psi Maximum Allowable Operating Pressure (6.2bar)knife Gate Valve

Size Range NPS 2 to 12 / DN 50 to 300 90psi Maximum Allowable Operating Pressure (6.2bar)knife Gate Valve

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Model NO. knife Gate Valves

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Size RangeNPS 2 to 12 / DN 50 to 300
Body MaterialsDuctile Iron, CF8, CF8M, CF3M, WCB
Stem Materials304 Stainless Steel
Gate Materials304, 316, 317 Stainless Steel, SAF 2507, SAF 2205, 17-4PH, Hastelloy® C, Monel®
Seat Material Temperature Range
Natural Rubber: 165°F / 74°CEPDM: 248°F / 120°C

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As the leader manufacure of knife Gate Valve-SJ

S J as knife gate valve manufacturers the Manual Actuated knife gate valve is designed with a cast iron body or fabricated steel body, stainless steel gate and two heavy-duty elastomer cartridge slurry seats. The knife gate valve port is formed by two heavy-duty cartridge elastomer slurry seat halves. The cartridge slurry seats are available in various elastomers for chemical compatibility and abrasion resistance. A flush area at the valve's base provides a clean-out port. The SJ Valve provides bi-directional shut off. A heavy-duty topworks is standard. As a leading industrial flow control pioneer, SJ specializes in manufacturing heavy-duty isolation solutions designed for the most challenging fluid conditions. Our high-performance knife gate valve lineup is specifically engineered to handle viscous media, slurries, and fibrous materials with ease. Featuring a razor-sharp, beveled gate, each gate valve knife effortlessly cuts through dense solids to achieve a tight, bi-directional seal. As one of the leading knife gate valve manufacturers, SJ utilizes premium materials like CF8M stainless steel to deliver superior corrosion resistance, minimal maintenance, and extended service life for industries worldwide.

SAMPLE DRAWING

Technical Description

Design Manufacture according to the requirements of the European directive n° 2014/68/UE «Equipment under pressure» : modulate H. In option:

product conform to European directive ATEX «ATmosphère EXplosive» n° 2014/34/UE.

Face to face Face to face dimension according to S J standard Connection Mounting between flanges in accordance with EN1092-2 and DIN 2501 : ISO PN10

Tests Pressure test according to standards EN12266-1, DIN 3230, BS 5154 and ISO 5208. DN Body Seat DN Body Seat DN50-250 : 15 bar 11 bar DN500-600: 6 bar 4.4 bar DN300-450: 10.5 bar 7.7 bar

Live scene presentation

Materials of parts
No.	Partname	Material
1	Body	A216WCB
2	Bonnet	A216WCB
3	Wedge	A216WCB+Cr13
4	Stem	A182 F6a
5	Seat ring	A105+CR13
6	Stem backseat	A276420
7	Bonnet gasket	(Soft iron)
8	Bonnet stud	A193 B7
9	Bonnet stud nut	A1942H
10	Packing	(Graiphite)
11	Gland	A276420
12	Gland flange	A216 WCB
13	Eyebolt pin	(Carbon steel)
14	Eye bolt	A193 B7
15	Eyebolt nut	A1942H
16	Grease fitting	(Copper alloy)
17	Yoke sleeve	A439D2
18	Yoke sleeve jam nut	ANSI1025
19	Handwheel	ASTM A395
20	Handwheel nut	ANSI1025

Applicable standards

Steel gate valves:API 600/API6D

Steel gate valves:ISO 10434

Steel valves:ASME B16.34

Face to face:ASME B16.10

End flanges:ASME B16.5

Butt welding ends:ASME B16.25

Inspection and test:API598/API6D

Design description

Fullport design
OS&Y,Outside screw and yoke

BB,Bolted bonnet
Flexible wedge,fully guided

Choice of solid orsplit wedge

Forged T-head stemNon-rising handwheel

Dimensions date
NPS DN	in	2	21-2	3	4	6	8	10	12	14	16	18	20
NPS DN	mm	50	65	80	100	150	200	250	300	350	400	450	500
L-L1 (RF-BW)	mm	292	330	356	432	559	660	787	838	889	991	1092	1194
L2 (RTJ)	mm	295	333	359	435	562	663	790	841	892	994	1095	1200
H (Open)	mm	427	473	538	657	872	1101	1279	1486	1643	1798	2101	2259
D0	mm	250	250	300	350	500	560	720	610*	610*	610*	610*	760*
WT (kg)	RF/RTJ	41	58	88	131	253	413	623	784	1288	1820	2150	2540
WT (kg)	BW	35	50	68	104	208	328	496	637	1120	1448	1828	2201
*Manual gearoperatoris recommended

Knife Gate Valve VS Butterfly Valve
Item	Knife Gate Valve	Butterfly Valve
Function	On‑off only	On‑off & flow throttling
Media	Slurry, sludge, solids/fibers	Water, gas, oil, clean fluid
Pressure drop	Very low (full bore)	Moderate
Operation	Slow linear stroke	Fast 90° quarter‑turn
Space needed	Larger vertical space	Compact, small footprint
Main use	Wastewater, mining, paper mill	HVAC, water supply, power plant

Knife Gate Valve

Q1: Can knife gate valve be used for flow throttling?

Answer: Knife gate valve is designed for on‑off service only. Partial opening for throttling will cause severe erosion to gate plate and seat, greatly shortening valve service life. It should work either fully open or fully closed.

SJ Conclusion: Knife gate valve is strictly for on‑off, not for throttling application.

Q2: What kind of media is knife gate valve suitable for?

Answer: It performs best for media containing solid particles, fibers, sludge, slurry and pulp. It is widely used in wastewater treatment, mining and paper‑making industry. It is not recommended for pure clean gas without solid content.

SJ Conclusion: Prioritize knife gate valve for slurry, sludge and fiber‑laden media.

Q3: What is the main limitation for knife gate valve on pressure?

Answer: Most standard knife gate valves are for low‑to‑medium pressure PN10 / PN16. High‑pressure working conditions are not its strength. For high‑pressure pipeline, please consider gate valve or ball valve as alternative.

SJ Conclusion: Standard knife gate valve applies to PN10‑PN16, avoid high‑pressure service.

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Head Office Address: Viale del Lavoro.19,20003 Casorezzo Ml. Italy Testing zone
Address:Via S. Giovanni Bosco S.n.c.70020 – Poggiorsini (BA) – ITALY

EMAIL: andant@sanjingvalve.com
PHONE: +39 389 949 9067
WHATSAPP: +39 389 949 9067

Branch Office Address: Dongou Industrial Zone, Oubei Street, Yongjia Wenzhou City, Zhejiang Province China Testing zone 2 Address:No. 205, Linwu Road, Sanqiao Industrial Zone

What exactly is the relationship between SANJING Valve Company and SJ Valvole S.R.L.?

SANJING Valve Company is the main manufacturing company, responsible for valve production, quality control, testing, and technical support. SJ Valvole S.R.L. serves as SANJING’s Italian office, supporting its business development, customer communication, and commercial activities in Italy and the European market.

Integrated Manufacturing and European Service

The two operations work together to provide customers with coordinated manufacturing and local market support:

Manufacturing & Quality Control: SANJING Valve Company manages valve manufacturing, inspection, testing, and quality control at its production facilities.

European Market Support: SJ Valvole S.R.L. supports customer communication, commercial coordination, and business development in Italy and other European markets.

Project Coordination: Customer requirements, technical specifications, documentation, production, and delivery can be coordinated between the Italian office and the manufacturing team.

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