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Slab Through Conduit Gate ValveZeco’s slab through conduit gate valves are manufactured with a full bore port, rising stem OS&Y and with floating seats and gate, pressure energized, for a bubble tight shut off upstream and downstream under both low and high differential pressure.

Principle: 

Double block and bleed capability and automatic relief of excess body pressure are a standard feature of this seat design. The smooth, continuous bore minimizes turbulence within the valve and when in the open position it produces a pressure drop equivalent to a portion of pipe of the same length and diameter. The seat faces are outside the flow stream and therefore protected from the erosive action of the flow. Pigs and scrapers can be run through the valve without damage.

Features：

1. Seat is o-type ring and floating seat structure, make flat valve import and export seal; And the structure of the opening and closing moment for the common valve only 1/2, can achieve easily open and close the valve;

2. When full open, channel smooth to linear, flow resistance coefficient is tiny, the pressure loss, can connect cleaning line;

3. With the packing structure of sealing ability, without constant adjustment, features very light open and close and sealing is reliable, stuffing box place an assisting sealing grease injection structure, sealed performances absolutely reliable and get a true zero leakage;Solve the common valve packing place the most easily leak of evils;

4. Valve closed can automatically unloaded lumen high pressure, ensure safe operation;

5. Fully closed structure, protective performance is good, suitable for the requirements.

Product Range:

Body material: stainless steel, carbon steel, forged steel, alloy steel

Nominal diameter: 1/2″～48″

Pressure range:Class150～1500

End connection: FF, RF, RTJ, BW

Working temperature:-196℃～593℃

Operation: Handwheel, Gear Box, Electric Actuator, etc.

 

Brand	Zeco
Valve Type	Slab Through Conduit Gate Valve
Valve Material	Cast steel, stainless steel, special alloy, etc
Valve Test	100% quantity tested before delivery
Valve Guarantee	18 months from the date of dispatch ex works, or 12 months from date of commodity installation.
Valve Painting	Customer request
Valve Package	Wooden case
MOQ	No requirement
Valve Certificate	API 6D/CE/ISO9001/ISO14001
Delivery Detail	Shipped in 4 or 6 weeks after payment
Port	SHANGHAI
Payment Terms	L/C, D/A, D/P, T/T
Certificate Offered	Packing List, Commercial Invoice, Test Reports and Material Certificates, Certificate of quality and quantity, Seller’s Certificate of Guarantee

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What is a Slab Gate Valve?

Slab gate valves are full-port valves, which means the hole in the gate is exactly the same size as the pipe. This full port design provides full flow through the valve and low-pressure drop, and it allows for pigging the line when needed.

The flow characteristics of ZECO slab gate valve with diversion holes are the same as those of the pipeline of the same diameter. Compared with the other two kinds of valves, the flow characteristics of the adjustment type slab gate valve without a diversion hole are better than those of the ordinary type without a diversion hole. Therefore, in the long pipeline, natural gas, oil industry, slab gate valve with diversion hole is particularly widely used. ZECO Valve Group, a well-known manufacturer of slab gate valves in China, can deliver large-scale, excellent quality, and exquisite appearance slab gate valves in full accordance with API 6D standards.

Specifications of Slab Gate Valves

Sealing of Slab Gate Valves

• Body Sealing
  • All primary body gaskets are metal-to-metal, spiral wounds, or ring-type joints.
  • Available upon request:
    • Secondary soft gasket to introduce a redundant barrier
    • Leak port detector

• Stem Sealing
  • PTFE Chevron Type: Thermoplastic multiple V-rings, with or without lantern ring.
  • Available upon request:
    • O-ring sealing
    • Graphite sealing
    • Metal-to-metal stem seals in addition to the standard thermoplastic seals
    • Sealant injection capability (optional)
    • Redundant elastomeric (AED ) stem gasket
    • Leak port detector

• Seat Sealing
  • ZECO Slab gate valve construction includes spring energized floating seats, which provide positive seating on both sides, regardless of upstream or downstream pressure conditions. The seat seals are spring energized to ensure sealing under low-pressure conditions. When the line pressure increases, the seat-to-gate contact pressure increases accordingly to provide a positive shutoff. Since both seats are individually energized by differential pressure across the seat itself, the valve cavity can be vented when the upstream and/or downstream side is pressurized. The valve exhibits identical performance, regardless of the direction of flow, and /or orientation of differential pressure.

Features of Slab Gate Valves

• Slab gate valves are comprised of a single gate unit that raises and lowers between two seat rings. Due to the fact that the gate slides between the seats, slab gate valves are suitable for the medium with suspended particles. The sealing surface of slab gate valves is virtually self-positioned and is not damaged by the thermal deformation of the body. Even if the valve is closed in a cold state, the hot elongation of the stem does not overload the sealing surface, and slab gate valves without diversion holes do not require high precision in the closing position of the gate. When the valve is fully open, the bore through is smooth and linear, and the flow resistance coefficient is minimal, peggable, and no pressure loss.
• ZECO slab gate valve is equipped with a grease injection hole, in case of sealing surface damage, the maintenance personnel can easily inject sealant through the grease injection hole to maintain the sealing surface to ensure the normal switching performance of the valve or in the case of maintenance, provide injection sealant to lubricate the sealing surface to extend the normal service life of the valve;
• When ZECO slab gate valve is fully open, the channel is the straight pipeline, the flow resistance coefficient and pressure loss are very small and almost negligible, which can reduce the cost of pipeline operation for users, and the pills can be used for cleaning when cleaning the pipeline;
• ZECO slab gate valve is equipped with an automatic pressure relief protection device, which can automatically relieve pressure in the case of overpressure in the middle chamber of the valve body to protect the safe use of the valve;
• The floating seat structure of ZECO slab gate valve ensures that the valve can be sealed in both directions.

Disadvantages of Slab Gate Valve

Slab gate valves also have some disadvantages: when the medium pressure is low, the metal sealing surface may not seal completely, instead, when the medium pressure is too high, the highly-frequency opening and closing may make the sealing surface wear too much when there is no medium or lubrication. Another drawback is that a circular gate that moves horizontally on a circular channel controls flow effectively only when it is at 50% of the valve’s closed position.

Material of Through Conduit Gate Valves

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What is a Through Conduit Gate Valve?

Through conduit gate valves are isolating valves designed for full closing of the working media flow. They can be used for temperatures up to 200°C. If the gate valves are used for regulating or throttling purposes, the manufacturer does not guarantee the tightness. The gate valves are full-bore piggable valves with a flow resistance coefficient equal to that of the piping. Therefore they are suitable, especially for long-distance pipeline systems.

ZECO through conduit gate valve is a straight pipe valve. The design is ideal to minimize pressure drop and prevent the accumulation of external materials such as mud into the valve chamber. This valve type is widely used in oil and gas transportation and conforms to API 6D standard. ZECO through conduit gate valve is available in three types: with diversion hole, without diversion hole, and with adjustment stricture. The pressure ranges from 150LB to 900LB and the size ranges from 1 inch to 48 inch. As a high-tech enterprise in China, ZECO is committed to creating ZECO brand through technology and innovation, and we believe that we have the ability to develop and produce world-class products to compete with international brands.

Design & Manufacturing Standards of Through Conduit Gate Valve

Both designs utilize flanged and butt-weld end connections, and are manufactured and tested in accordance with API 6D. The full port bi-directional flow capability minimizes pressure drop and turbulence.

Types of Through Conduit Gate Valve

Double Block and Bleed (DBB)

Valves with two seating surfaces in the closed position, block flow from both valve ends and allow the cavity between the seating surface to be vented through a bleed connection provided on the body cavity. In case of both seats are tight, DBB provides draining of the body cavity and reduction of pressure. Hence, it will be possible to monitor the performance of valve seats and provide a safe environment to work on the other side of the line.

Double Isolating Bleed (DIB)

This will also provide draining of the valve cavity and reduction of pressure. If, however, the pressure at the upstream side is released and the fluid entrapped in the body cavity is enlarged due to thermal changes, draining occurs to the upstream side. This is an important design for the block valves of pipelines. Correct selection has to be made depending on the type of application.

Applications of Through Conduit Gate Valves

Through conduit gate valves are used in applications like offshore platforms, onshore terminals, and transmission lines.

Commonly used types of medium in these applications are: non-corrosive liquids, gas, water, sour service, hydrocarbon liquids, or gas

Features of Through Conduit Gate Valves

• Efficient strangulation with minimal stretching or erosion of the disc or seat.
• Short stroke of the disc and a few turns to actuate them, which reduces the time and wear on the stem and bonnet.
• Precise traffic control.
• Available with multiple drills.

Material of Through Conduit Gate Valve:

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What are Industrial Valves?

In industrial applications, valves play a vital role in controlling or regulating media movement in piping systems. The wide scope of industrial applications allows more varieties in valve design.

While most are for the stop-start mechanism, certain valves also have throttling capabilities. Additionally, valves are either manually operated or with the use of a gear that moves the actuator.

Any person engaging in the piping business should understand the importance of valves. Knowing the operation and maintenance of valves ensures that these can last longer. It also ensures that the entire piping process is without delays.

This article discusses everything you need to know about industrial valves. Included in this article are the different valve functions and the general valve parts. This article also discusses the commonly used valves in industrial applications.

What is Industrial Gate Valve?

Industrial Gate Valves or “Block Valves” are the most commonly used valve type in the oil & gas industry. Gate valves are intended for on-off flow control. When fully open, fluid flows through the valve in a straight line, resulting in minimum pressure drop across the valve.

Industrial gate valves are suitable for both above-ground and underground installation and are designed for fully open or fully closed service. They are installed in pipelines as isolating valves and should not be used as control or regulating valve.

These valves can be divided into two main types, namely parallel and wedge-shaped. Parallel industrial gate valves use a flat gate between two parallel seats. The knife gate valve is a popular valve designed this way, with a sharp edge on the bottom of the gate. Wedge-shaped industrial gate valves use two inclined seats and a slightly mismatched inclined gate.

Industrial gate valves used to be a metal seated wedge with the conical wedge design and angular sealing devices needing a depression in the valve bottom to ensure a tight closure. These days resilient seated gate valves have a plain valve bottom that allows for the free passage of sand and pebbles in the valve.

Rising stems are fixed to industrial gate valves and raise or lower as the gate is operated. This is a visual indication of the industrial gate valve’s position and this makes it easier to grease the stem. This type of industrial gate valve is usually only suited to above-ground installations.

Non-rising stems are threaded into the gate itself and take up less vertical space. These valves are suitable for both above-ground and underground installations.

Industrial gate valves are long-lasting and durable and don’t require much maintenance.

Specifications of Industrial Gate Valve

Industrial Gate Valve Parts And Components

The industrial valve is a collective set of smaller parts. There are internal and external parts. While specific valve types contain certain components definitive to that design, all industrial valves share major valve components. This section will discuss the different valve parts.

Body

The body houses the internal parts of the valve, including the trim. This is also the passageway for the fluid. Industrial valve manufacturers produce this as either of the three: cast, forged, or fabricated. The body also connects the valve on both ends to the pipe system.

Bonnet

The two functions of the bonnet are:

It houses the internal parts of the valves.

It supports the stem since it is in the of the bonnet in many valve types.

Valve Trim

The valve trim refers to the collective valve parts that come in contact with the flow media. These are the disc, the valve seat, and the stem. Take note, some valves may have additional parts, but generally speaking, these three are always present in most valves.

The type of seat and disc, along with the placement of the disc in relation to the seat, determine the valve trim performance. It is also the combination of the disc, seat, and stem that determines the movement and control of the valve.

• Disc
  • The disc has alternative names depending on the type of valve. Ball and gate are two other names for the disc. This part can function as a throttle or to stop/permit the flow of media into the valve to the pipes.
• Seat
  • The seat provides a cushion for the disc. Seal rings are its other name. Some types of valves have one seat while others have two or more. The higher the number of seats, the better sealing. Multiport valves have more seats since these have more than one exit. Some seats are integrated into the valve structure. Others are replaceable.
  • The quality of the valve seat directly affects the effectiveness of leakage prevention. Depending on the requirements like the type of flow media, temperature and pressure gauges, and the like, valves are either elastomer like Teflon or metal.
• Stem
  • The stem is the shaft that connects the disc to the actuator. This part supplies the motion needed to open or close the disc. The opening and closing movements are either linear like the gate or globe valves, or rotational like the butterfly and ball valves.
• Bolts
  • Bolts hold one valve part to another, for example, the bonnet to the body. The bolts make the seal tighter.
• Actuator
  • The actuator goes by many names such as wheels, levers, and handles. More often than not, the names follow the design of the actuator. Gate and globe valves have manual handwheels as actuators. On the other hand, ball, plug, and butterfly valves have levers that act as actuators. While manual actuators are common, there are circumstances that automation or power is the ideal way to actuate. There are issues with valve location such as being remote. Time does not allow the valves to open quickly via manual methods.
  • The valve is large and the pressure is too high; manual opening becomes risky.
• Packing
  • This is also called the gasket. Packing functions as a seal between the stem and the bonnet. This plays an important role as the proper installation of the packing increases the life service of the valve.
  • Installed too loose, the valve leaks. If installed too tight, the valve cannot move. Packing, in other words, reduces damage and increases the sealing capability of the valve. It has five components, namely the gland follower, the gland, the stuffing box, and the backseat.
• Yoke
  • The yoke is the arm that connects the body and bonnet to the actuator. Made as a one-piece with the bonnet, the yoke should withstand the force applied to the actuator. The yoke contains the nuts and bushing that act as connectors to other parts of the valve.

Features of Industrial Gate Valves

• ZECO industrial gate valve is designed with a seal, which can meet the needs of replacing packing with pressure in the maintenance field, and ensure no leakage when replacing packing. Compared with the original replacement process of disassembling the valve, it accelerates the speed greatly, saves the time of personnel, and optimizes the operation time of the pipeline;
• Long thread stem nut prolongs tread life and permits the removal of the hand wheel in the fully open position;
• Flexible graphite gasket used for 150 Class gate valve, spiral wound gasket for Class 300 & 600 valves, and metal ring gasket for gate valves of 900 or greater Class(600 Class is obtainable if customer requires);
• During the opening and closing of the valve, the integral guide in the valve body keeps the wedge from the center. Without the integral guide, the gate seal will be offset, and the structure of the ZECO industrial gate valve stabilizes the sealing performance.

Applications of Industrial Gate Valves

• Cost and Energy efficient
• Simple body design and easy to operate
• Dual flow direction, depending on the medium
• Minimum erosion experienced
• Minimum pressure involved, due to streamlining the flow

Product Overview of Industrial Gate Valves

Industrial Valve Manufacturer

ZECO Valve is an industrial valve manufacturer of ball valves, gate valves, globe valves, check valves, butterfly valves, plug valves, and strainers. Our valve factory in China adheres to ANSI, API, DIN, GOST, BS, JIS, China GB standards, and customer-specific requirements. Our products have been sold worldwide for a wide range of applications in natural gas, oil, oil refining, chemical, marine, power generation, and pipeline transportation industries.

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Gate valve Types as per Type of Closing Element

• Parallel disk Gate Valve
• Wedge Gate Valve

What is a Wedge Gate Valve?

ZECO wedge gate valve is one of the gate valve types. Wedge gate valves are named because the two sealing surfaces resemble wedges in the body. In general, the two wedge gate valve sealing surface and the Angle of the vertical center line of 2 ° 52 ‘, 3 ’30 °, 5 °, 8 °, and so on. Wedge gate valves can be divided into rising stem gate valve and non-rising stem gate valve according to the stem structure, and wedge gate valve and double disc gate valve according to the gate structure. ZECO is a professional gate valve manufacturer in China, with nearly 30 years of experience and history in the production of gate valves.

Types of Wedge Gate Valve

Solid Wedge Gate Valve

he solid, or single wedge gate valve is the most widely used and the lowest cost used-type in the process industry for oil, gas and air services. The purpose of the wedge shape is to introduce a high supplementary seating load. Solid-Wedge Gate Valve can be installed in any position, suitable for almost all fluids and practical for turbulent flow services.

In some situations, the valve cannot be reopened until the system temperature reheats the valve; this phenomenon is known as “Thermal blinding”. Wedge gate valves can be further described as inside screw or outside screw patterns. Solid wedge gate valves in waterworks industry are popular as Sluice valves.

Flexible Wedge Gate Valve

The flexible wedge is a one-piece solid disk with a cut around the perimeter. These cuts vary in size, shape, and depth. A shallow, narrow cut on the wedge perimeter gives less flexibility but retains strength. A cast-in recess or deeper and wider cut on the wedge perimeter gives more flexibility but compromises the strength.

This design improves seat alignment and offers better leak tightness. It also improved performance in situations where thermal binding possible. Flexible wedges Gate valves are used in steam systems.

Applications of Wedge Gate Valves

Suitable for general application as on/off and isolation valves, not recommended for throttling and/or regulating purposes. They have excellent resistance to earthquake, shocks, vibration, pressure & strokes and can be operated soundly between -196°C to 595°C.

Features of Wedge Gate Valve:

• ZECO wedge gate valve adopts wedge type gate, because the Angle of the gate is wedge type with the vertical center line, it can be closed more and more tightly in the closing process, further ensuring the sealing effect;
• ZECO wedge gate valve adopts lifting stem, which can visually see the opening or closing state of the valve from a distance and is easier to judge. The stem and gate are connected by t-groove, and the t-head of the stem is forged as a whole to ensure sufficient connection strength;
• ZECO wedge gate valve is designed with a sealed design that allows replacement of the packing when fully open. This design ensures that the packing can be replaced online when it needs to be replaced if the packing is damaged, preventing personnel waste caused by disassembly of the valve;
• ZECO wedge gate valve is designed with anti-collision protection on the flange surface when it leaves the factory, which can protect the convex surface connected with the pipe flange during transportation and prevent damage of the valve in collision.

Material of Wedge Gate Valve:

ZECO Wedge Gate Valve Licence & Approvals

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