Double Disc Gate Valve

Trusted Double Disc Gate Valve Manufacturer

NTVAL provides durable Double Disc Gate Valves for large-scale industrial applications. Known for reliability, long service life, and excellent sealing, each valve is precisely crafted to meet strict industry standards, ensuring optimal performance in tough conditions.

Reliable Double Disc Gate Valve

Quality Control

The PMI test verifies that the metal used in the double disc gate valve matches required specifications, confirming it is suitable for use.

PMI Test

The sealing test checks if the double disc gate valve creates a proper seal by applying pressure, confirming it can prevent leaks.

Sealing Test

The low emission test checks how well the double disc gate valve minimizes harmful gas release by testing its ability to meet standards.

Low Emission Test

The impact test evaluates how well the double disc gate valve handles force, confirming it can withstand shocks without damage.

Impact Test

Dimension inspection checks the measurements of the double disc gate valve’s components, verifying they fit properly for smooth operation.

Dimension Inspection

The painting thickness test measures how much paint covers the valve, confirming there is enough coating to protect it from rust.

Painting Thickness Test

The PT test detects small cracks in the double disc gate valve by applying liquid to its surface, revealing any hidden flaws.

PT

Material inspection verifies that the double disc gate valve’s components are made from the correct materials to handle pressure and temperature needs.

Material Inspection

Our Valve Applications in Key Industries

Discover how our advanced valve solutions improve flow control, delivering enhanced efficiency, safety, and strict quality assurance.

The double disc gate valve provides a strong seal, preventing leaks and handling harsh chemicals, making it perfect for chemical processing plants.

Chemical Processing

In the petrochemical industry, double disc gate valves manage high pressure and corrosive fluids, making them a reliable choice for safe operation.

Petrol Chemical

Double disc gate valves withstand extreme conditions in O.P.G. and nuclear plants, providing safety and reliability in these critical environments.

O.P.G & Nuclear

The mining industry benefits from double disc gate valves, as they manage abrasive materials and rough conditions, allowing long-lasting performance underground.

Pulp

The mining industry benefits from double disc gate valves, as they manage abrasive materials and rough conditions, allowing long-lasting performance underground.

Mining

Double disc gate valves work effectively in water and sewage systems by preventing leaks and controlling large volumes of flow efficiently.

Water & Sewage

In steam systems, double disc gate valves provide reliable pressure control, preventing leaks and allowing safe, smooth steam flow throughout.

Steam System

Double disc gate valves handle the high heat and pressure in boiling systems, making them a dependable choice for thermal processes.

Boiling System

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Double Disc Gate Valve: Body and Bonnet

Body

The Double Disc Gate Valve body is available in both cast and forged steel, designed to meet ASME, API, and BS standards. The body-bonnet connection uses a pressure seal gasket, secured by bolts on the bonnet flange. The valve ends are typically butt-welded, with flanged options available upon request.

Bonnet

The bonnet is usually made from the same material as the body and is designed with extra wall thickness to meet API 600 standards. A backseat bush in the bonnet allows for repacking while the valve is in service. The bonnet also features a deep stuffing box with ample space for packing rings and a lantern ring.

Double Disc Gate Valve: Yoke and Stem

Yoke

The yoke is a separate, rigid component designed to handle the thrust of the actuator. It has large windows for easy access and ventilation of the packing area. The yoke is connected to the body using a two-piece clamping ring and is typically made of cast carbon steel unless specified otherwise.

Stem

The stem is made from stainless steel, machined from solid bar stock, and threaded into the upper wedge. It features a conical shoulder to create a reliable backseat seal, allowing for maintenance while the valve is in service. The stem is carefully polished to reduce friction and enhance corrosion resistance.

Double Disc Gate Valve: Gland Components and Seat Ring

Gland Bushing and Gland Flange

The gland bushing and flange are designed as two self-aligning pieces to apply even pressure during packing. The upper part of the gland is spherical for smooth operation. Typically made from carbon steel, other materials can be provided if needed.

Seat Ring

The seat rings are forged from stainless steel and hard-faced with a 2 mm layer of Stellite-6. They are welded to the body and can be replaced if necessary. The sealing surfaces are precisely lapped to provide a secure seal, with hardness differences maintained according to API 600.

Double Disc Gate Valve: Discs and Yoke Sleeve

Discs

The discs are forged from the same material as the valve body and are hard-faced with Stellite-6 for durability. The revolving design of the discs helps distribute wear evenly, extending the valve’s service life. These discs are specifically designed to ensure a tight seal when in operation.

Yoke Sleeve

The yoke sleeve can be easily removed from the bonnet or yoke while the valve is in service. It is typically made of cast aluminum bronze, chosen for its wear resistance and high melting point. Ball bearings are used in the yoke sleeve assembly to provide smooth operation.

Double Disc Gate Valve: Back Seat and Handwheel

Back Seat

The back seat is available as a threaded stainless steel bush or as an integral part of the valve, often hard-faced with Stellite-6. It allows the valve to be repacked while under pressure. The back seat is constructed to handle high-pressure conditions effectively.

Handwheel

The handwheel is available in either cast or fabricated steel, designed for easy operation. Various control options, such as chain wheels or gear operators, are available based on specific application needs. These options provide flexibility in operating the valve across different settings.

Double Disc Gate Valve: Pressure Seal Gasket and Packing

Pressure Seal Gasket

The pressure seal gaskets are typically made of compressed graphite with reinforced carbon fiber edges. Stainless steel gaskets can also be supplied if required. These gaskets are engineered to maintain a reliable seal under high-pressure conditions.

Packing

Packing consists of preformed rings made from high-grade graphite, with anti-extrusion rings placed at the top and bottom. The design is chosen to ensure a dependable seal across a variety of conditions. Other packing materials can be provided for specialized applications.

Double Disc Gate Valve: Disc Retainers and Spacer Ring

Disc Retainers

The disc retainers are made from the same material as the valve body and are firmly connected to the upper wedge. They keep the discs in place while allowing them to rotate, helping to distribute wear evenly. The retainer assembly is designed to provide consistent performance over time.

Spacer Ring

The spacer ring covers the upper part of the pressure seal gasket and is made from the same material as the valve body. It supports the integrity of the seal under high pressure. The single-piece design adds strength and durability to the overall valve structure.

Double Disc Gate Valve: Gasket Retainer and Bonnet Retainer

Gasket Retainer

The gasket retainer is typically made from the same material as the valve body and is constructed in four segments to minimize gaps. It supports the forces transmitted from the bonnet through the pressure seal gasket. This design is calculated to handle high pressures without cracking.

Bonnet Retainer

The bonnet retainer is strong enough to manage the forces from the bonnet screws and is made from the same material as the valve body. It is carefully machined to match the body for perfect alignment. This precision ensures smooth operation and maintains the valve’s performance.

Double Disc Gate Valve: Yoke Clamp and Wedges

Yoke Clamp

The yoke clamp connects the valve body and yoke using a bipartite clamping ring. This internal connection is conical, providing a secure fit and easy maintenance. The design ensures a stable connection that supports the valve’s reliable operation.

Upper and Lower Wedges

The upper and lower wedges are made from forged or cast steel, matching the valve body material, and are hard-faced with Stellite-6. These wedges are designed to stay engaged while sliding, ensuring the discs are pressed tightly against the seat rings. Springs between the wedges help absorb forces and allow for smooth contact.

Pressure Seal Bonnet Double Disc Gate Valve

Standard Materials

Technical Advantages of The Double Disc Wedge Assembly

The Double Disc Gate Valve is designed to function reliably even in the most challenging conditions. Its unique design, especially the geometry of the upper wedge's inclined face, prevents the disc from becoming stuck in the closed position. This feature supports smooth operation, even during quick closures or sudden temperature changes.

The wedge assembly in the Double Disc Gate Valve is crafted to apply enough force to each disc to ensure a secure seal, even at low pressures. As the pressure difference across the discs rises, the seating force increases, maintaining a tight seal throughout all operating pressure levels. Because the discs operate independently and the design is symmetrical, the valve provides reliable sealing in both flow directions.

The unique wedge design of the Double Disc Gate Valve ensures a tight seal, even if the valve seats become misaligned due to body distortion. This design allows for an even distribution of sealing pressure, maintaining a reliable seal under various conditions. The valve's construction adapts to changes, ensuring consistent performance over time.

Dependable Performance

Effective Low-Pressure Sealing

Consistent Sealing Pressure

The Double Disc Gate Valve features a revolving disc mechanism that extends the life of the seats. As the valve closes, the two discs rotate slightly before seating. This rotation causes the discs to land in a different position each time, helping to evenly distribute wear. Additionally, this movement cleans the sealing surfaces, preventing potential damage.

The NTVAL Double Disc Wedge system allows for quick closure without distorting the seat. The internal parts slow down independently, spreading out inertial forces through a series of smaller impacts. The largest force is directed to the bottom of the valve body, away from the sealing surface, minimizing stress on the seats.

The 4 piece double disc wedge assembly is designed to prevent incorrect assembly or disengagement during use. Maintenance is straightforward and does not require any special fittings or tools. If there is minor damage to the seats or discs, repairs are easy because the seats and discs can be lapped separately. Additionally, disassembly and maintenance can be performed without special tools or complex equipment.

Even Seat Wear

Quick Closure

Simple Maintenance

Parallel Slide Gate Valve

Parallel slide gate valves offer an alternative to double disc valves by using a single wedge instead of a double wedge design. A horizontal spring maintains constant contact between the discs and seat rings, providing a secure seal. This design delivers reliable performance with a simpler mechanism.

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Additional General Insights Here

Specs of Double Disc Gate Valve

End Connections

The valve is equipped with various end connection options, including butt-welding and flanged ends. Butt-welding ends are ideal for high-pressure applications, offering a secure and leak-free connection. Flanged ends, on the other hand, offer ease of installation and removal, which is beneficial during maintenance or replacement.

Pressure Rating

This valve is built to handle high-pressure situations, making sure it works well even when the pressure is really strong. It comes with different pressure ratings, like ASME Class 1500 and 2500, to suit various jobs. This means the valve can keep a tight seal and work reliably even when the pressure is high. And on top of that, the different pressure ratings allow the valve to be used in many different settings.

Material Composition

The Double Disc Gate Valve is made from strong materials like carbon steel, alloy steel, and stainless steel. These materials are carefully picked to make sure the valve works well in different environments. For example, the valve body can be made from a type of carbon steel that is very strong and can handle high pressure.

Size Range

NTVAL’s Double Disc Gate Valves are available in a wide range of sizes. The sizes typically range from 2 inches to 36 inches, making them suitable for both medium and large-scale operations. The larger sizes, such as 36 inches, are often used in applications where a high flow rate must be controlled.

Features of Double Disc Gate Valve

Zero Fluid Leakage

The Double Disc Gate Valve is designed to prevent any fluid from leaking, allowing the flow to be controlled and secure. This feature is critical in maintaining the safety and efficiency of operations where even a small leak could lead to significant problems. The valve’s strong construction offers a tight seal, making it reliable in various industrial settings.

High-Temperature Tolerance

These valves are designed to perform well under extreme temperatures, ranging from cryogenic conditions to high-heat environments. This feature is crucial for industries that deal with processes involving extreme temperature changes, allowing the valve to operate effectively without losing its integrity.

Durable Construction

Special Material Valves are constructed with sturdy materials that provide high strength and durability. This means they can handle high-pressure applications without deforming or failing. NTVAL’s Special Material Valves are specifically engineered to offer long-lasting performance, even in the most demanding industrial settings.

Benefits of Double Disc Gate Valve

Enhanced Safety

Special Material Valves contribute to enhanced safety in industrial operations by reducing the risk of leaks or failures in harsh environments. The materials used, like titanium and duplex steel, are designed to withstand extreme conditions. And the best part is that this minimizes the chances of accidents that could lead to costly damage or hazardous situations.

Low Maintenance Requirements

Due to their strong construction and resistance to wear and tear, Special Material Valves require less frequent maintenance. This benefit translates into lower operational costs and reduced downtime, allowing the projects to run more smoothly without the need for constant repairs or replacements.

Reliable Performance

Thanks to their ability to withstand extreme conditions, Special Material Valves offer consistent and reliable performance. Whether in high-pressure or high-temperature environments, these valves maintain their functionality, allowing critical processes to continue without interruption. This reliability is especially important for large-scale industrial applications.

Applications of Double Disc Gate Valve

Oil and Gas Industry

Double Disc Gate Valves are used in the oil and gas industry to control the flow of crude oil and natural gas. These valves are essential in pipelines and refineries, where they handle high-pressure and temperature conditions. Their ability to prevent leaks makes them a reliable choice for these critical applications.

Chemical Manufacturing

In the chemical manufacturing industry, Double Disc Gate Valves play a key role in controlling the flow of various chemicals during production. These valves are chosen for their resistance to corrosion and ability to handle aggressive fluids. They make sure that the flow is precisely controlled, which is important for maintaining efficiency in chemical processes.

Water Supply Systems

Double Disc Gate Valves are commonly used in water supply systems to manage the distribution of water. Here’s how it works: it regulates water flow in pipelines, allowing for consistent delivery to homes and industries. NTVAL valves are valued for their reliability and ease of operation, which is crucial for maintaining a steady water supply.

Mining Industry

Double Disc Gate Valves are used in mining operations to control the flow of abrasive slurries, water, and other materials. Built to withstand harsh conditions, these valves provide reliable flow control in high-pressure mining applications, helping keep processes running smoothly and minimizing downtime.

3 Considerations When Buying Double Disc Gate Valve

01 Material Quality

When purchasing a Double Disc Gate Valve, it’s important to consider the material used in its construction. High-quality materials like carbon steel or stainless steel are essential for durability and long-term performance, especially in demanding environments. So what’s the catch? Valves made from inferior materials may wear out quickly or fail under pressure.

02 Size and Compatibility

Before buying a Double Disc Gate Valve, check if the valve size is compatible with the existing pipeline system. For instance, valves that are too small or too large might not fit properly or may cause operational issues. NTVAL offers a wide range of sizes, offering the perfect fit for the intended system. This compatibility is key to maintaining efficient flow and preventing leaks or blockages.

03 Certification and Standards

It’s important to choose valves that meet industry standards and certifications. Valves certified by recognized organizations, like API or ASME, have been tested for quality and safety. This certification is a sign of reliability and guarantees that the valve will perform well under the conditions it was designed for. Valves that meet these standards are a safer and more reliable choice for large projects.

FAQs of Double Disc Gate Valve

1. How are Double Disc Gate Valves operated?

These valves can be operated manually with a handwheel or automatically with an actuator. The choice depends on the specific needs of the application.

2. What certifications do Double Disc Gate Valves have?

Our Double Disc Gate Valves are certified by major industry standards, including ISO9001, ISO14001, ISO45001, API6D, and API607. These certifications certify our valves meet high-quality and safety standards.

3. What maintenance is required for Double Disc Gate Valves?

4. What is the warranty period for NTVAL’s Double Disc Gate Valves?

Our Double Disc Gate Valves come with an 18-month warranty from the delivery date, covering any manufacturing defects or performance issues.

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ASME CLASS 600
SIZE	2”	2 I/2”	3”	4”	6”	8”	10”	12”	14”	16”	18”	20”	24”	26”	28”	32”	36″
A	177,8	215,9	254	304,8	457,2	584,2	711,2	812,8	889	990,5	1092,2	1193,8	1397	1447	1549	1778	2082
F(RF)	292,1	330,2	355,6	431,8	558,8	660,4	787,4	838,2	889	990,5	092,2	1193,8	1397	1447	1549	1778	2082
J(RJ)	295,1	333,2	358,6	434,8	561,8	663,4	790,4	841,2	892	993,6	1095,2	1200,1	1406,6	1456,6	1558,6	1787,6	2091,5
B	500	533	686	813	1067	1168	1397	1626	1753	1981	2108	2489	2794	2990	3150	3550	3800
øC	203	203	254	305	355	510	510	610	610	610	915	915	915	915	915	915	915
OPERATION	HANDWHEEL GEAR
WEIGHT	34,5	36,8	55,2	89,7	190,9	316,25	499,1	690	1016,6	1353,55	1756,05	2754,25	3920,35	4542,5	5462,5	10292,5	9401,25
Cv	273	375	550	1025	2375	4225	6625	9850	12025	15900	20100	24900	36525	46300	54038	69848	93685

ASME CLASS 900
SIZE	2”	2 I/2”	3”	4”	6”	8”	10”	12”	14”	16”	18”	20”	24”	25”	30”	36”
A	215,9	304,8	304,8	355,6	508	660,4	787,4	914,4	990,6	1092,2	1219,2	1320,8	1549,4	1574	1778	2032
F(RF)	368,3	419,1	381	457,2	609,6	736,6	838,2	965,2	1028,7	1130,3	1219,2	1320,8	1549,4	1574	1778	2032
J(RJ)	371,3	422,1	384	460,2	612,6	739,6	841,2	968,2	1038,3	1139,9	1231,9	1333,5	1568,4	1593,5	1797	2051
B	530	638	638	831	1072	1186	1500	1540	1725	1836	2220	2412	2650	2880	4060	4885
øC	254	305	305	381	610	686	800	1000	750	750	1000	750	1000	750	1000	1000
WEIGHT	74,75	77,05	70,15	101,2	251,85	441,6	763,6	977,5	1702	2162	3174	4128,5	6152,5	6532	10350	15525
OPERATION	HANDWHEEL GEAR
Cv	218	300	500	950	2175	3825	6125	8850	10875	14325	18300	22875	33275	36678	50198	87027

ASME CLASS 1500
SIZE	2”	2 I/2”	3”	4”	6”	8”	10”	12”	14”	16”	18”	20”	24”	28”	32”	36″
A	215,9	254	304,8	406,4	558,8	711,2	863,5	990,6	1066,8	1193,8	1346	1473,2	1752,6	2209	2413	2565
F(RF)	368,3	419,1	469,9	546,1	704,8	831,8	990,6	1130,3	1257,3	1384,3	1536,7	1663,7	1943,1	2209	2413	2565
J(RJ)	371,3	422,1	472,9	549,1	711,1	841,4	1000,2	1146	1276,3	1406,6	1559	1686	1971,5	2228	2432	2584
B	530	758	758	861	1002	1080	1490	1530	1850	1960	1950	2385	2795	3405	4150	4950
øC	254	381	381	457	686	686	600	750	900	750	600	900	900	900	900	900
OPERATION	HANDWHEEL GEAR
WEIGHT	74,75	83,95	83,95	184	379,5	650,9	1076,4	1472	2357,5	2777,25	4268,8	5175	8222,5	11097,5	15237,5	18572,5
Cv	218	300	450	817	1875	3275	5250	7525	9175	12150	15500	19600	28775	42572	55027	73806

ASME CLASS 2500
SIZE	2”	2 I/2”	3”	4”	6”	8”	10”	12”	14”	16”	18”	20”	24”	28”	32”	36″
A	279,4	330,2	368,3	457,2	609,6	762	914,4	1041,4	1117,6	1244,6	1397	1397	1625	1905	2184	2413
F(RF)	450,8	508	577,8	673,1	914,4	1022,3	1270	1422,4
J(RJ)	453,8	514,3	584,1	682,7	927,1	103,8	1292,3	1444,7
B	515	736	736	840	1000	1220	1484	1680	1842	1988	2250	2510	2950	3450	4150	4900
øC	381	457	457	534	800	600	750	600	900	600	900	900	900	900	900	900
WEIGHT	138	158,7	167,9	241,5	455,4	7877,5	1524,9	2375,9	3082	3737,5	5002,5	6532	9545	13225	20355	24150
OPERATION	HANDWHEEL GEAR
Cv	145	200	300	500	1250	2200	3600	5200	6400	8500	10875	13325	19725	29183	37720	50592

PART.	Denomination	CARBON STEEL	ALLOY STEEL	STAINLESS STEEL
1	BODY	ASTM A216 WCB	ASTMA217 WC9	ASTM A351 CF8M
2	BONNET	ASTM A105	ASTM A 182 F22	ASTMA182 F316
3	YOKE	ASTM A216 WCB	ASTMA216 WCB	ASTMA216 WCB
4	STEM	ASTMA182 F6A	ASTM A182 F6A	ASTM A182 F316
5	GLAND	ASTM A182 F6A	ASTMA182 F6A	ASTM A182 F316
6	SEAT RING	ASTM A105+STELLITE	ASTM A182F22+STELLITE	ASTM A351CF8M+STELLITE
7	UPPER WEDGE	ASTM A216WCB+STELLITE	ASTMA217WC9+STELLITE	ASTM A351CF8M+STELLITE
7A	LOWER WEDGE	ASTM A216WCB+STELLITE	ASTM A217WC9+STELLITE	ASTM A351CF8M+STELLITE
9	DISC	ASTM A105+STELLITE	ASTM A182F22+STELLITE	ASTM A351CF8M+STELLITE
11	YOKE SLEEVE	ALUMINIUM-BRONZE	ALUMINIUM-BRONZE	ALUMINIUM-BRONZE
13	BACK SEAl	ASTM A105+STELLITE	ASTM A182F22+STELLITE	ASTM A182F316+STELLITE
15	HANDWHEEL	CARBON STEEL	CARBON STEEL	CARBON STEEL
17	PRESSURE SEAL GASKET	COMPRESSED &BRAIDED GRAPHITE	COMPRESSED &BRAIDED GRAPHITE	COMPRESSED &BRAIDED GRAPHITE
20	SLEEVE NUT	CARBON STEEL	CARBON STEEL	CARBON STEEL
22	GLAND NUT	ASTMA1942H	ASTM A1942H	ASTM A1942H
24	YOKE FLANGE	CARBON STEEL	CARBON STEEL	CARBON STEEL
56	WEDGE SPRING	AISI 302	AISI302	AISI 302
68	INTERMEDIATE PACKING	GRAPHITE	GRAPHITE	GRAPHITE
68A	END PACKING	BRAIDED GRAPHITE	BRAIDED GRAPHITE	BRAIDED GRAPHITE
75	BEARING	COMMERCIAL	COMMERCIAL	COMMERCIAL
80	DISC RETAINER	ASTM A515Gr70	ASTMA182F6A	ASTM A182 F316
87	SPRING WASHER	AISI 304	AISI 304	AISI 304
111	YOKE FLANGE CAP SCREW	AISI 4140	AISI 4140	AISI 4140
111A	BONNET CAP SCREW	AISI 4140	AISI 4140	AISI 4140
118	GLAND RETAINER CAP SCREW	AISI 4140	AISI 4140	AISI 4140
125	GLAND FLANGE	ASTMA515 Gr 70	ASTMA515 Gr 70	ASTMA515 Gr 70
127	YOKE CLAMP STUD	ASTM A193 B7	ASTM A193 B7	ASTM A193 B7
128	GLAND BOLT	ASTM A193 B7	ASTMA193 B7	ASTM A193 B7
129	YOKE CLAMP NUT	ASTMA1942H	ASTMA1942H	ASTM A1942H
129A	DISC RETAINER NUT	ASTMA1942H	ASTMA1942H	ASTM A1942H
132	SPACER RING	ASTM A105	ASTMA182 F22	ASTM A182 F316
133	GASKET RETAINER	ASTMA105	ASTM A182 F22	ASTM A182 F316
134	BONNET RETAINER	ASTMA515 Gr 70	ASTM A515 Gr 70	ASTM A515 Gr 70
193	YOKE CLAMP	ASTMA515 Gr 70	ASTMA515 Gr 70	ASTMA515 Gr 70
194	GLAND RETAINER	ASTMA515 Gr 70	ASTM A515 Gr 70	ASTM A515 Gr 70
195	GREASE FITTING	COMMERCIAL	COMMERCIAL	COMMERCIAL
198	WEDGE PIN	AISI 431	AISI 431	AISI 431
198A	COTTER PIN	STAINLESS STEEL	STAINLESS STEEL	STAINLESS STEEL