Class 250 Outside Screw & Yoke Gate Valve

Model：GV-05
Date Updated: August 14, 2026
Prepared by: Gate Valve Technical Department

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Ningjin APC Industries is a premier UL & FM certified manufacturer in China, delivering high-performance industrial and fire protection valves built to strict international safety standards.

CLASS250 Outside Screw&Yoke Gate Valve

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Class 250 Outside Screw & Yoke Gate Valve

▏Product Description

The Class 250 Outside Screw & Yoke Gate Valve (Model GV-05) from Ningjin APC Industries is a heavy-duty, bi-directional fluid control valve engineered for high-pressure industrial water, municipal wastewater processing, and mechanical HVAC piping systems. Manufactured in full compliance with MSS SP-70 standards and hydrostatically tested per API 598, this resilient OS&Y gate valve features an external rising stem design that isolates actuation threads from process fluids while providing immediate visual position indication. Built with robust Cast Iron pressure-containing components, corrosion-resistant Cast Bronze seats, and a durable Brass stem, the GV-05 delivers dependable bi-directional isolation across working temperatures from -20°C to 180°C. For mechanical engineers, EPC contractors, and industrial procurement managers seeking custom flange drilling, protective epoxy coatings, or bulk OEM industrial flow control solutions, Ningjin APC Industries offers comprehensive engineering support and reliable project delivery.

▏Technical Features

Feature Item	Specification Details
Size	DN50-DN600 / 2"-24"
Working Pressure	Class 250
Design Standard	MSS SP-70
Test Standard	API 598
Flange Standard	ASME B16.2(250LB)
Face to Face Standard	ASME B16.10(250LB)
Working Temperature	-20°C to 180°C
Note	NSF 61 and NSF 372 approval available for 2"-12"

▏Valve Material List

NO.	Part	Material
1	Body	Cast Iron
2	Seat Rings	Cast Bronze
3	Wedge Face Rings	Cast Bronze
4	Wedge	Cast Iron
5	Stem	Brass
6	Body Gasket	Graphite
7	Bolts	Steel
8	Nuts	Steel
9	Bonnet	Cast Iron
10	Back Seat Bushing	Cast Brass
11	Packing	Graphite
12	Packing Gland	Cast Brass
13	Gland Follower Bolts	Steel
14	Gland Follower Nuts	Steel
15	Bolts	Steel
16	Nuts	Steel
17	Gland Follower	Ductile Iron
18	Yoke Bushing	Cast Bronze
19	Yoke Bushing Nut	Cast Iron
20	Screw	Steel
21	Handwheel	Cast Iron
22	Identification Plate	Aluminium
23	Handwheel Nut	Ductile Iron
24	Yoke	Cast Iron

▏Dimensions

DN	INCH	L	Dg	D	b	ANSI 300		Do	H
DN	INCH	L	Dg	D	b	Dk	n-d	Do	H
50	2"	216	106.5	165	22.3	127	8-19	178	380
65	2.5"	241	125.5	191	25.4	149	8-22	178	430
80	3"	282	144.5	210	28.6	168	8-22	200	485
100	4"	305	176.5	254	31.8	200	8-22	254	615
125	5"	381	211.5	279	35	235	8-22	300	700
150	6"	403	246.5	318	36.6	270	12-22	300	835
200	8"	419	303.5	381	41.3	330	12-25	348	1010
250	10"	457	357.5	445	47.6	387	16-29	400	1220
300	12"	502	418	521	50.8	451	16-32	457	1435
350	14"	572	481.5	584	54	514	20-32	508	1655
400	16"	610	535	648	57.3	572	20-35	558	1825
450	18"	660	592.5	711	60.4	629	24-35	610	2020
500	20"	711	649.5	775	63.5	686	24-35	640	2290
600	24"	787	768.5	914	69.9	813	24-41	762	3360

▏Frequently Asked Questions

What design standards and pressure ratings apply to the Class 250 Outside Screw & Yoke Gate Valve (Model GV-05)?

The Class 250 Outside Screw & Yoke Gate Valve (Model GV-05) is manufactured in compliance with the MSS SP-70 design specification and rigorously tested to API 598 inspection standards. Engineered for higher pressure fluid distribution, this gate valve carries a robust Class 250 working pressure rating across nominal pipe sizes from DN50 (2") up to DN600 (24"). Its flange connections strictly adhere to ASME B16.2 (250LB) flange standards, while face-to-face dimensions follow ASME B16.10 (250LB) guidelines for seamless inline integration. Able to withstand operating temperatures ranging from -20°C to 180°C, the valve's rising stem Outside Screw & Yoke (OS&Y) design provides clear visual indication of open or closed status while shielding operating stem threads from process fluid corrosion.

What materials are used in the construction of the Class 250 Outside Screw & Yoke Gate Valve?

The Class 250 Outside Screw & Yoke Gate Valve utilizes heavy-duty Cast Iron for the valve body, wedge, bonnet, yoke, yoke bushing nut, and handwheel, providing outstanding structural stability for demanding industrial pipelines. To ensure tight shutoff and superior wear resistance, the seat rings, wedge face rings, and yoke bushing are precision-crafted from Cast Bronze. The operating stem is made from durable Brass, while the body gasket and packing utilize high-purity graphite for reliable thermal and chemical seal integrity. Structural components such as the gland follower, handwheel nut, bolts, nuts, and screws are constructed from Ductile Iron, Cast Brass, and high-tensile Steel. This multi-material construction ensures maximum service longevity in heavy fluid handling environments.

How does the OS&Y design benefit maintenance and operational safety in high-pressure fluid systems?

The Outside Screw & Yoke (OS&Y) architecture of the Class 250 Outside Screw & Yoke Gate Valve isolates the stem threads outside the flow path, protecting actuation mechanisms against fluid corrosion and debris buildup. The rising stem configuration allows plant engineers to visually verify valve position from a distance instantly, preventing operational errors during maintenance or emergency shutdowns. The inclusion of a Cast Brass back seat bushing and graphite packing allows inline packing adjustment under pressure without requiring system shutdowns. Engineering contractors seeking robust flow isolation solutions can partner with a trusted Class 250 Outside Screw & Yoke Gate Valve supplier like Ningjin APC Industries for custom configurations and reliable technical support.

What quality control and testing procedures are performed on the Class 250 Outside Screw & Yoke Gate Valve?

Every Class 250 Outside Screw & Yoke Gate Valve manufactured by Ningjin APC Industries undergoes comprehensive hydrostatic shell and seat testing in strict accordance with API 598 standards. These factory acceptance tests verify bi-directional zero-leakage performance under high operating pressures, guaranteeing system integrity across municipal water networks, industrial plant processing, and wastewater systems. Furthermore, manufacturing processes adhere to ISO 9001 quality management guidelines. For specific potable water applications spanning sizes 2" through 12", NSF 61 and NSF 372 compliance options are available upon request. Through rigorous quality assurance, these heavy-duty gate valves deliver consistent performance, minimizing inline pressure drops and reducing long-term lifecycle maintenance costs.

What lead times and OEM customization options are available for bulk orders of the Class 250 Outside Screw & Yoke Gate Valve?

Ningjin APC Industries provides complete OEM/ODM manufacturing services for the Class 250 Outside Screw & Yoke Gate Valve with a standardized lead time of 45 working days for bulk B2B procurement projects. Global EPC contractors and valve distributors can request customized flange drilling patterns, special protective epoxy body coatings, or specific hardware material upgrades to meet unique project specifications. Each production run is fully supported by material test certificates, dimensional inspection sheets, and factory pressure test reports. Our dedicated engineering team works directly with client technical departments to ensure complete compliance with local piping codes and international fluid handling standards worldwide.

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