Knife Gate Valve "UB" Type - DN50-2000

DN50 to 600

DN700 to 2000

DN50 to 600

DN700 to 2000

Leaning floor stand

Straight floor stands

Electrovalves

DN50 à 600

DN700 à 2000

DN50 à 600

DN700 à 2000

DN50 à 600

DN700 à 2000

Knife Gate Valve "UB" Type - DN50-2000

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Manual type
Main features

  • Bidirectional knife gate valve with "wafer" design.
  • Two-piece cast body, joined by screws, with internal guides for smooth movement of through conduit during operation.
  • Provides high flow rates with low pressure drop.
  • Various seal and gasket materials available.
  • Distance between faces in accordance with Standard UNE-EN 558 Basic Series 20.

General applications

This knife gate valve is suitable for working with clean liquids or liquids with a concentration of bland solids:

  • Drying plants.
  • Paper Industry.
  • Sewage treatment.
  • Chemical plants
  • Food industry.
  • Mining.
  • Oil extraction.
  • Sludge.

Sizes and working pressure

Sizes: DN50 to DN2000 (other dimensions to order).

Working (∆P) :

  • DN50 to DN250 : 10kg/cm2
  • DN300 and 350 : 8 / 10kg/cm2
  • DN400 and DN450 : 6 / 10kg/cm2
  • DN500 and DN600 : 5 / 10kg/cm2
  • DN700 to DN1400 : 2 / 4 / 6 / 10kg/cm2
  • DN1600 to DN2000 : 2 / 4 / 6kg/cm2

Boring: DIN PN10 and ANSI B16.5 (class 150).

Other common flanges:

  • DIN PN 6 (JIS Standard.)
  • DIN PN 16 (Australian Standard)
  • DIN PN25 (British Standard.)

Directives

  • Machinery Directive: DIR 2006/42/EC (MACHINERY).
  • Pressure Equipment Directive: DIR 97/23/EC (PED) ART.3, P.3.
  • Potentially Explosive Atmospheres Directive (optional): DIR 94/9/EC (ATEX) CAT.3 ZONE 2 and 22 GD
  • For information on categories and zones please contact Saint-Gobain PAM Technical-Sales Department.

Quality dossier

All valves are tested hydrostatically at PAM and material and test certificates can be provided.

  • Body test = working pressure x 1.5.
  • Seal test = working pressure x 1.1.

Added values

The main characteristic of this valve is the body design. This is a body formed by two screwed parts which have been machined on the inside, providing the valve with capacity to work with fluids in both directions and with the same pressure.

The seal is located between the two parts of the body, and this seal is secured with the screws used to attach the two parts of the body. In valves DN50 to DN600 the seal has a metal core inserted in order to withstand the fluid pressure and allow the valve to shut off correctly. In valves over DN600 the two parts of the body have an outer rim to ensure the seal remains in position.

This seal design provides a completely flat seat with no internal cavities and avoids any build-up of solids in the seat area.

The stem on the PAM valve is made of 18/8 stainless steel. This is another added advantage, as some manufacturers produce it with 13% chrome and it gets rusty very quickly.

The handwheel is made of GGG-50 nodular cast iron. Some manufacturers produce them in normal cast iron which can lead to breakages in the event of very high operating torque or knocks. The yoke has a compact design with the bronze actuator nut protected in a sealed and lubricated box. This makes it possible to move the valve with a key, even without the handwheel (in other manufacturers’ products this is not possible).

The pneumatic actuator's upper and lower covers are made of GGG-40 nodular cast iron, making them highly shock resistant. This characteristic is essential in pneumatic actuators.

The pneumatic cylinder sealing joints are commercial products and can be purchased worldwide. This means it is not necessary to contact PAM every time a sealing joint is required.

Materials and coating

Item

Component

Cast iron version

St. steel version

1

Body

GGG50

CF8M

2

Through conduit

AISI304 / DUPLEX

AISI316 / DUPLEX

3

Seal Rim

AISI304

AISI316

4

Stuffing box seal

EPDM

EPDM

5

Seal

EPDM + STEEL

EPDM + STEEL

6

Seat

-

RCH 1000

7

Support

S275JR

S275JR

8

Stem nut

BRONZE

BRONZE

9

Stem

AISI303

AISI303

10

Yoke

GGG50

GGG50

11

Stem nut

BRONZE

BRONZE

12

Stopper Nut

STEEL

STEEL

13

Handwheel

GGG50

GGG50

14

Nut

5.6 ZINC

5.6 ZINC

Design characteristics

Body

Wafer design reinforced cast body, comprising two screwed parts. The stainless steel version has RCH1000 interior nylon slides which provide smooth movement of the through conduit; on the other hand, the GGG50 versions do not require slides.

The internal surface of both parts is fully machined and assembled with screws to form a solid block.

Designed with total passage, with the shape of the inside of the body preventing the build-up of solids in the seal area; this means that there is no cavitation in open position and, in consequence, there is no turbulence in the fluid and the loss of load is minimum, thus providing large flows.

The standard manufacturing materials are CF8M stainless steel and GGG50 nodular cast iron. Other materials such as A216WCB carbon steel and stainless steel alloys (AISI316Ti, Duplex, 254SMO, Uranus B6, etc.) are available to order. As standard, the carbon steel or nodular cast iron valves are painted with EPOXY anti-corrosive protection (colour RAL 5015). Other types of anti-corrosive protections are available to order.

Through conduit

The standard manufacturing materials are AISI304 stainless steel in valves with iron body and AISI316 stainless steel in valves with CF8M body. In both cases, whenever the high pressures to withstand so require, we also make use of DUPLEX material.

Other materials or combinations can be supplied to order.

The through conduit is polished on both sides to provide a smooth contact surface with the resilient seal. At the same time, the through conduit is rounded to prevent the sealing joint from being cut. Different degrees of polishing, anti-abrasion treatments and modifications are available to adapt the valves to the customer's requirements.

Seat

This type of valve has an elastic seat which is made up of a rubber seal located between the two parts of the body, secured with the screws used to join the two parts of the body.

In valves DN50 to DN600 the seal has a metal core inserted in order to withstand the fluid pressure and allow the valve to shut off correctly.

In valves over DN600 the two parts of the body have an outer rim to ensure the seal remains in position. This seal design provides a completely flat seat with no internal cavities and avoids any build-up of solids in the seat area.

DN50 to 600

DN700 to 2000

Seal tight materials :

  • EPDM : This is the standard resilient seal fitted on PAM valves. It can be used in many applications, however, it is generally used for water and products diluted in water at temperatures no higher than 90ºC*. It can also be used with abrasive products and provides the valve with 100% sealtightness.
  • NITRILE : Used in fluids containing fats or oils at temperatures no higher than 90ºC*. Provides the valve with 100% sealtightness.
  • VITON : Suitable for corrosive applications and high temperatures up to 190ºC continuously and peaks of 210ºC. Provides the valve with 100% sealtightness.
  • SILICONE : Mainly used in the food industry and for pharmaceutical products with temperatures no higher than 200ºC. Provides the valve with sealtightness of 100%.
  • PTFE : Suitable for corrosive applications and pH between 2 and 12. Does not provide the valve with 100% sealtightness. Estimated leakage: 0.5% of the pipe flow.

In some applications other types of resilient materials are used, such as hypalon, butile or natural rubber. Please contact us if you require one of these materials.

EPDM and Nitrile: possible up to Max temp: 120ºC to order.

Gasket

Valves DN50 to DN600 not have the traditional gasket system, but rather a rubber strip inserted in the top of each body half. This system avoids the need to regularly replace the gasket and also offers the possibility of regulating the body from the outside by way of screws.

DN50 to 600

DN700 to 2000

Valves over DN600 do have the traditional system and the standard PAM gasket comprises several lines (from 4 to 6 lines) of seal, providing the required sealtightness between the body and the through conduit and preventing any type of leakage. It is located in an easily accessible place and can be replaced without dismantling the valve from the pipeline. Below we indicate various types of gasket available according to the use to be given to the valve :

  • GREASED COTTON (Recommended for hydraulic services) : This gasket is composed of braided cotton fibres soaked in grease both inside and out. It is for general use in hydraulic applications in both pumps and valves.
  • DRY COTTON : This gasket is composed of cotton fibres. It is for general use in hydraulic applications with solids.
  • COTTON + PTFE : This gasket is composed of braided cotton fibres soaked in PTFE both inside and out. It is for general use in hydraulic applications in both pumps and valves.
  • SYNTHETIC + PTFE : This gasket is composed of braided synthetic fibres soaked in PTFE both inside and out. It is for general use in hydraulic applications in both pumps and valves and in all types of fluids, especially corrosive ones, including concentrated and oxidising oils. It is also used in liquids with solid particles in suspension.
  • LUBRICATED PTFE : It is made with PTFE filaments and designed to work at great speed. It is braided with a diagonal system. Suitable for valves and pumps which work with almost all types of fluids, particularly with the most corrosive, such as oxidant and concentrated oils. It is also used in liquids with solid content.
  • GRAPHITE : This gasket is composed of high-purity graphite fibres. A diagonal braiding system is used and is impregnated with graphite and lubricant which helps to reduce porosity and improve operation. It has a wide range of applications as graphite is resistant to steam, water, oils, solvents, alkali and most acids.
  • CERAMIC FIBRE : This gasket is composed of ceramic material fibres. Its main applications are with air or gas at high temperatures and low pressures.

NOTE: More details and other materials available to order.

Gasket
MaterialP(bar)Max. Temp (°C)pH

Greased cotton

10

1006-8

Dry cotton (AS)

0,5

1006-8
Cotton + PTFE301206-8
Synthetic + PTFE100-200+2700-14
Graphite406500-14
Ceramic Fibre0,314000-14

Stem

The stem on the PAM valve is made of 18/8 stainless steel. This characteristic provides high resistance and excellent corrosion-resistant properties.

The standard valve design is with non-rising stem, although rising stem is also available. When a rising stem is required for the valve, a stem hood is supplied to protect the stem from contact with dust and dirt, besides keeping it lubricated.

Packing Gland

As mentioned above, valves DN50 to DN600 do not have the traditional packing system, but rather a stuffing box seal built into the body. Nevertheless, the common packing system is still used in sizes over DN600; this allows uniform pressure and force to be applied to the gasket, thus ensuring sealtightness. As standard, valves with steel body include a steel packing gland flange, while for valves with stainless steel body this is made of stainless steel.

Stem

The stem on the PAM valve is made of 18/8 stainless steel. This characteristic provides high resistance and excellent corrosion-resistant properties.

The standard valve design is with non-rising stem, although rising stem is also available. When a rising stem is required for the valve, a stem hood is supplied to protect the stem from contact with dust and dirt, besides keeping it lubricated.

Packing Gland

As mentioned above, valves DN50 to DN600 do not have the traditional packing system, but rather a stuffing box seal built into the body. Nevertheless, the common packing system is still used in sizes over DN600; this allows uniform pressure and force to be applied to the gasket, thus ensuring sealtightness. As standard, valves with steel body include a steel packing gland flange, while for valves with stainless steel body this is made of stainless steel.

Actuators

All types of actuators can be supplied, with the advantage that, thanks to the PAM design, they are fully interchangeable. This design allows customers to change the actuators themselves and no extra assembly accessories are required. A design characteristic of PAM valves is that all actuators are interchangeable.

  • Manual : - Handwheel with non-rising stem - Chainwheel - Lever - Gears - Others (square stem, etc)
  • Automatic : - Electric actuator - Pneumatic cylinder - Hydraulic cylinder

Wide range of accessories available: mechanical stoppers, locking devices, emergency manual actuators, electrovalves, positioners, limit switches, proximity switches, leaning floor stand, straight floor stands

Leaning floor stand

Straight floor stands

Stem extensions have also been developed, allowing the actuator to be located far away from the valve, to suit all needs.

Please consult our technicians beforehand.

Item

Designation

1

Handwheel with rising stem

2

Pneumatic actuator

3

Electric-motor actuator

4

Hydraulic actuator

5

GHandwheel with non rising

Accessories and options

Different accessories are available to adapt the valve to specific working conditions such as:

  • Mirror polished through conduit: The mirror polished through conduit is especially recommended in the food industry and, as standard, in applications in which solids can stick to the through conduit. It is an alternative to ensure the solids slide off and do not stick to the through conduit.
  • PTFE lined through conduit: As with the mirror polished through conduit, it improves the valve's resistance to products that can stick to the through conduit.
  • Stellited through conduit: Stellite is added to the through conduit's lower perimeter to protect it from abrasion.
  • Scraper in the gasket: Its function is to clean the through conduit during the opening movement and prevent possible damage to the gasket.
  • Air injections in the gasket: By injecting air in the gasket, an air chamber is created which improves sealtightness.
  • Cased body: Recommended in applications in which the fluid can harden and solidify inside the valve's body. An external jacket keeps the body temperature constant, preventing the fluid from solidifying.
  • Electrovalves: For air distribution to pneumatic actuators. Electrovalves
  • Connection boxes, wiring and pneumatic piping: Units supplied fully assembled with all the necessary accessories.
  • Mechanical limit switches, inductive sensors and positioners: Installation of limit switches or inductive switches to indicate specific valve position, and positioners to indicate continuous position.
  • Mechanical locking device: Allows the valve to be mechanically locked in a set position for long periods.
  • Stroke limiting mechanical stops: Allow the stroke to be mechanically adjusted, limiting the valve run.
  • Emergency manual actuator (hand wheel / gear box): Allows manual operation of the valve in the event of power or air failure.
  • V-notch and pentagonal diaphragm with indication rule: Recommended for applications in which it is necessary to regulate the flow, it allows flow control according to the valve's opening percentage.
  • Interchangeable actuators: All actuators are easily interchangeable.
  • Actuator or yoke support: Made of EPOXY-coated steel (or stainless steel to order), its robust design gives it great rigidity in order to resist the most adverse operation conditions.
  • Epoxy coating: All carbon steel or nodular cast-iron components and bodies of the PAM valves are EPOXY coated, giving the valves great resistance to corrosion and an excellent surface finish. PAM’s standard colour is blue RAL-5015.

Types of extensions

When the valve needs to be operated from a distance, the following different types of actuators can be fitted :

  • Extension : Floor Stand - This extension is performed by coupling a spindle to the stem. By defining the length of the spindle, the desired extension is achieved. A floor stand is normally installed to support the actuator. - The definition variables are as follows: H1: Distance from the valve shaft to the base of the stand, d1: Separation from the wall to the end of the connecting flange. - Characteristics: a) It can be coupled to any type of actuator. b) A stem support-guide is recommended every 1.5 m. c) The standard floor stand is 800 mm high. Other floor stand measurements available to order. d) A position indicator can be fitted to determine the valve's percentage of opening. e) Possibility of leaning floor stand. f) Components list Component Standard Version Stem AISI 303 Spindle AISI 304 Guide-support Carbon steel with EPOXI coating Slide Nylon Floor Stand GGG 50 with EPOXY coating
  • Extension : Pipe - Consists of raising the actuator. The pipe will rotate with the wheel or key when the valve is operated, although this will always remain at the same height. - The definition variables are as follows: H1: Distance from the valve shaft to the required height of the actuator, d1: Separation from the wall to the end of the connecting flange. - Characteristics: a) Standard actuators: Handwheel and “Square Stem”. b) A pipe support-guide is recommended every 1.5m. c) The standard materials are: EPOXY coated carbon steel or stainless steel.
  • Extension: Extended Support Plates When a short extension is required, it can be achieved by extending the support plates. An intermediate yoke can be fitted to reinforce the support plates structure.
  • Extension: Cardan joint If the valve and the actuator are not in correct alignment, the problem can be resolved by fitting a universal joint.

Handwheel - Chain

  • Widely used in raised installations with difficult access, the handwheel is fitted in vertical position.
  • B = max. width of the valve (without actuator). D = max. height of the valve (without actuator).
  • Options : - Limiting switches. - Extensions: stand, pipe, plates,...
  • Actuator comprising: - Handwheel - Stem - Nut
  • Available: DN50 to DN600, other DN to order.
  • From DN250 the actuator is with gears, see * in table.

Lever

  • This is a fast actuator.
  • B = max. width of the valve (without actuator). D = max. height of the valve (without actuator).
  • The actuator includes: - Lever - Spindle - Guide bushing - External limiting switches to maintain position
  • Available: DN50 to DN200, other DN to order.
  • Actuator designed to run at 2kg/cm2 of differential pressure (∆P).

Geared motor

  • This is recommended from DN 350.
  • B = max. width of the valve (without actuator). D = max. height of the valve (without actuator).
  • Options : - Chainwheel - Limiting switches - Extensions: stand, pipe, plates,...
  • Actuator comprising: - Stem - Yoke - Cone-shaped gear box - Handwheel
  • Standard reduction ratio = 4 to 1.
  • Available: DN 50 to DN 2000, other DN to order.

DN50 à 600

DN700 à 2000

Double acting pneumatic cylinder

  • The air supply pressure to the pneumatic cylinder is a minimum of 6 Kg/cm2 and a maximum of 10 Kg/cm2, the air must be dry and lubricated.
  • 10 Kg/cm2 is the maximum admissible air pressure. For air pressures below 6 Kg/cm2, please check with PAM.
  • For DN50 to DN150 valves, the cylinder's jacket and covers are made of aluminium, the spindle in AISI304, the piston of rubber-coated steel and the O-ring seals are made of nitrile.
  • For valves over DN150 the covers are made of nodular cast iron or carbon steel.
  • To order, we can also supply the actuator made entirely of stainless steel, especially for installation in corrosive atmospheres.
  • B = max. width of the valve (without actuator). D = max. height of the valve (without actuator).
  • Available: DN50 to DN600, other DN to order

Electric actuator

  • This actuator is automatic and includes the following parts: - Electric motor - Stem - Yoke
  • The electric motor includes: - Emergency manual handwheel - Limit switches - Torque limiters
  • Options: choice of different types and brands
  • ISO 5210 / DIN 3338 Flanges.
  • Available: DN50 to DN 2000, other DN to order.
  • From DN300 the motor is assisted with a gear box.

DN50 à 600

DN700 à 2000

Hydraulic actuator (Oil pressure: 135 Kg/cm2)

  • B = max. width of the valve (without actuator). D = max. height of the valve (without actuator).
  • The hydraulic actuator includes: - Hydraulic cylinder - Stem - Yoke
  • Available: DN50 to DN 2000, other DN to order.
  • Different types and brands available according to customer's requirements.

DN50 à 600

DN700 à 2000

Information on flange dimensions

  • EN 1092-2 PN10
DNΔPThreadedDepthØ K
mmkg/cm2QuantityQuantitymmmmmm
501022M169125
651022M169145
801026M1611160
1001026M1612180
1251026M1612210
1501026M2014240
2001026M2014295
2501048M2014350
3008 - 1048M2014400
3508 - 10610M2020460
4006 - 10610M2421515
4506 - 10812M2422565
5005 - 10812M2422620
6005 - 10812M2722725
7002 - 4 - 6 - 10204M2723840
8002 - 4 - 6 - 10204M3023950
9002 - 4 - 6 - 10244M30231050
10002 - 4 - 6 - 10244M33231160
12002 - 4 - 6 - 10284M36301380
14002 - 4 - 6 - 10324M39301590
16002 - 4 - 6364M45351820
18002 - 4 - 6404M45352020
20002 - 4 - 6444M45402230
  • ANSI B16, class 150
DNΔPR UNCDepthØ K
mmkg/cm2QuantityQuantityinchmmmm
2"10225/8"9120.6
2.510225/8"9139.7
3"10225/8"11152.4
4"10265/8"12190.5
5"10263/4"12215.9
6"10263/4"14241.3
8"10263/4"14298.4
10"10487/8"14361.9
12"8 - 10487/8"14431.8
14"8 - 10481"20476.2
16"6 - 106101"21539.7
18"6 - 1061011/8"22577.8
20"5 - 1081211/8"22635
24"5 - 1081211/4"22749.3
28"2 - 4 - 6 - 1020411/4"23863.6
32"2 - 4 - 6 - 1024411/2"23977.9
36"2 - 4 - 6 - 1028411/2"231085.9
40"2 - 4 - 6 - 1032411/2"231200.2
48"2 - 4 - 6 - 1040411/2"301422.4
56"2 - 4 - 6 - 1044413/4"301651