Johnson Controls VG7000 Series Manuel utilisateur

Refer to the QuickLIT website for the most up-to-date version of this document.

VG7000 Series Bronze Control Valves Installation Instructions

Applications

VG7000 Series Bronze Control Valves are primarily

designed to regulate the flow of water and steam in

response to the demand of a controller in Heating,

Ventilating, andAir Conditioning (HVAC) systems.

Contact the local Johnson Controls® representative for

compatibility concerns before using the VG7000 Series

Bronze Control Valves Technical Specifications table at

the end of this document.

These installation instructions conform to the relevant

and valid European Norm (EN) safety standards, as

well as the current laws and regulations of the

European Union. Qualified personnel are required for

the proper application of these installation instructions.

Qualified personnel are trained in the installation,

mounting, commissioning, operation, and servicing of

pneumatically and electrically actuated VG7000 Series

Bronze Control Valves; they include trainers and

instructors who have the following responsibilities:

• ensure adherence to regional and international

ordinances and requirements

• teach safety standards

• enforce adequate facility safety and protective

operation

• instruct first aid

Location of Valve Data

Each VG7000 Series Bronze Control Valve shipped

from the factory includes a brass tag chained to the

valve bonnet. The tag features technical data about the

valve, including:

•code number of the valve

•flow coefficient Cv of the valve

•maximum allowable fluid temperature of the

controlled media

•manufacturing date code of the valve (as

illustrated in Figure 1)

Installation

Pre-installation Details

Before installing a VG7000 Series Bronze Control

Valves, note the following:

• Be sure to mount the valve in an upright position, in

a conveniently accessible location.

• Protect the electric actuator from dripping water

that could enter the actuator housing and damage

the mechanism or motor.

• Do not cover the actuator with insulating material.

• Allow sufficient clearance to remove the actuator

(see Figure 2, Table 1, and Table 2).

• Pipe the valve with the flow in the direction of the

arrow on the valve body, so that the plug seats

against the flow.

• Wire all electrically actuated valve assemblies in

accordance with applicable electrical code

requirements. Input lines to the actuator must be

wired correctly for the valve to move in the proper

direction.

IMPORTANT: The VG7000 Series Bronze Control

Valves are intended to control saturated steam, hot

water, and chilled water flow under normal

equipment operating conditions. Where failure or

malfunction of the VG7000 Series Valve could lead

to personal injury or property damage to the

controlled equipment or other property, additional

precautions must be designed into the control

system. Incorporate and maintain other devices,

such as supervisory or alarm systems or safety or

limit controls, intended to warn of or protect against

failure or malfunction of the VG7000 Series Valve.

Figure 1: Manufacturing Date Code

Manufacturing Facility

w wy y

Week

Year

FIG:mfgd

VG7000 Series Bronze Control Valves

Installation Instructions

VG7000 Part No. 14-1078-6, Rev. M

Release Issued December 2018

*1410786RevM*

14-1078-6 Rev. M

VG7000 Series Bronze Control Valves Installation Instructions

Dimensions

IMPORTANT: Take care to prevent foreign material

such as weld slag, thread burrs, metal chips, and

scale from entering the piping system. This debris

can damage or severely impede the operation of the

valve by embedding itself in the seats, scoring the

valve, and ultimately resulting in seat leakage. If the

debris becomes embedded in the seats, subsequent

flushing and filtering of the piping system with the

valve installed does not remedy the problem.

Table 1: Internal National Pipe Thread (NPT) Valve Dimensions, in. (mm)

Valve Size, in. (DN) A B

N.O., N.C., and

Three-Way N.O. N.C. Three-Way

1/2 (DN15) 3 (76) 13/16 (21) 1-9/16 (39) 1-13/16 (46)

3/4 (DN20) 3-7/32 (81) 15/16 (24) 1-5/8 (41) 2-1/8 (54)

1 (DN25) 4-1/8 (104) 1-5/32 (29) 1-3/4 (44) 2-9/16 (65)

1-1/4 (DN32) 4-23/32 (119) 1-11/32 (34) 2 (51) 2-25/32 (70)

1-1/2 (DN40) 5-1/8 (130) 2-5/32 (55) 2-3/4 (70) 3-3/8 (85)

2 (DN50) 5-29/32 (150) 2-1/8 (53) 2-27/32 (72) 3-3/4 (95)

Figure 2: Two-Way Normally Open (N.O.)/Push-Down-to-Close (PDTC),

Two-Way Normally Closed (N.C.)/Push-Down-to-Open (PDTO), and Three-Way Mixing Valve Dimensions,

Fluid Flow Directions, and Port Designations (See Table 1 and Table 2.)

Outlet

Inlet

Valve + Actuator

Clearance Needed

forActuator Mounting

and Removal

N.O.

(PDTC)

N.C.

(PDTO)

Fig:VG7000

VG7000 Series Bronze Control Valves Installation Instructions

Table 2: Valve Assembly Dimensions, in. (mm)

Actuator

Type C1D1

1/2 in.

(DN15) 3/4 in.

(DN20) 1in.

(DN25) 1-1/4 in.

(DN32) 1-1/2 in.

(DN40) 2in.

(DN50)

Brass Trim Valve Assemblies

V-3000-8012 4-3/4

(120) 4-3/4

(120) 5-31/32

(151) 5-7/8

(149) 5-13/16

(147) 6-3/16

(157) 3-9/16

(90)

V-3000-8003 5-11/32

(135) 5-11/32

(135) 6-9/16

(166) 6-19/32

(167) 6-13/32

(162) 6-13/16

(172) 3-9/16

(90)

V-3801-8001 4 (102) 4 (102) --- --- --- --- 2-3/8 (60)

MP82xx,

MP83xx --- --- 12-23/32

(323) 12-27/32

(326) 13-13/32

(341) 13-13/16

(351) 3-1/2

(89)

VA-4233 8-15/32

(215) 8-15/32

(215) 9-7/16

(240) 9-9/16

(243) --- --- 1-1/2

(38)

VA-715x 7-11/16

(195) 7-11/16

(195) 8-21/32

(220) 8-25/32

(223) 9-11/32

(238) 9-3/4

(248) 2-1/2

(64)

VA-720x --- --- 10-7/16

(265) 10-17/32

(268) 11-1/8

(283) 11-1/2

(293) 4-1/2

(114)

VA-8x2x 6-7/16

(164) 6-7/16

(164) --- --- --- --- 1-1/2

(38)

VA78x0 --- --- 11-23/32

(298) 11-27/32

(301) 12-13/32

(315) 12-13/16

(325) 4-1/2

(114)

Stainless Steel Trim Valve Assemblies2

V-3000-8012 5-7/16

(138) 5-7/16

(138) 6

(152) 6-1/4

(158) --- --- 3-9/16

(90)

V-3000-8003 6-1/16

(153) 6-1/4

(158) 6-19/32

(167) 6-27/32

(173) --- --- 3-9/16

(90)

MP82xx 12-3/4

(324) 13-17/64

(337) 13-39/64

(346) 13-27/32

(352) 14-1/32

(356) 14-15/64

(361) 3-1/2

(89)

MP83xx 12-21/64

(313) 12-35/64

(319) 12-7/8

(327) 13-1/8

(333) 13-19/64

(338) 13-1/2

(343) 3-1/2

(89)

MP84xx --- --- --- --- 17-7/32

(437) 17-27/64

(443) 3-1/2

(89)

MP85xx --- --- --- --- 15-61/64

(405) 16-5/32

(410) 3-1/2

(89)

VA-4233 8-23/32

(221) 8-15/16

(227) 9-9/32

(236) 9-13/16

(249) --- --- 1-1/2

(38)

VA-715x 8-13/32

(214) 8-5/8

(219) 8-31/32

(228) 9-7/32

(234) 9-13/32

(239) 9-5/8

(244) 2-1/2

(64)

VA-720x 9-3/32

(231) 9-5/16

(236) 9-21/32

(245) 9-7/8

(251) 10-3/32

(256) 10-9/32

(261) 4-1/2

(114)

VA78x0 11-15/32

(291) 11-11/16

(297) 12-19/32

(320) 12-27/32

(326) 13-1/32

(331) 13-1/4

(336) 4-1/2

(114)

1. Dimension Cis the overall height above the centerline of the valve body, and dimension Dis the clearance required for

actuator removal (as illustrated in Figure 2).

2. An extended bonnet comes as standard equipment on VG7000 Series Bronze Control Valves with stainless steel trim,

to allow for higher fluid temperatures (100 psig [690 kPa] saturated steam at 338°F [170°C]).

VG7000 Series Bronze Control Valves Installation Instructions

Table 3: Two-Way N.O./PDTC and Two-Way N.C./PDTO Union Globe Valve Dimensions, in. (mm)1

Valve Size, in. (DN) E F G

1/2 (DN15) N.O./PDTC 1-1/2 (38) 2-21/32 (68) 13/16 (20)

1/2 (DN15) N.C./PDTO 1-1/2 (38) 2-21/32 (68) 1-17/32 (39)

3/4 (DN20) N.O./PDTC21-9/16 (40) 3-3/32 (79) 15/16 (24)

1 (DN25) N.O./PDTC22-1/16 (53) 4-1/32 (102) 1-5/32 (29)

1-1/4 (DN32) N.O./PDTC22-3/8 (60) 4-19/32 (117) 1-11/32 (34)

1-1/2 (DN40) N.O./PDTC22-9/16 (65) 4-27/32 (123) 2-5/32 (55)

1. See Table 2 for overall assembly height Cand clearance Ddimensions.

2. Sizes greater than 1/2 in. (DN15) are available in N.O./PDTC only.

Figure 3: Two-Way N.O./PDTC and Two-Way N.C./PDTO Union Globe Valve Dimensions (See Table 3.)

Fig:unionglobe

Figure 4: Two-Way N.O./PDTC Union Angle Valve Dimensions (See Table 4.)

Fig:unionangle

Table 4: Two-Way N.O./PDTC Union Angle Valve Dimensions, in. (mm)1

Valve Size, in. (DN) E F G

1/2 (DN15) N.O./PDTC 1-23/32 (44) 2-21/32 (68) 1-7/8 (48)

3/4 (DN20) N.O./PDTC 1-9/16 (40) 3-3/32 (79) 2-1/8 (54)

VG7000 Series Bronze Control Valves Installation Instructions

Repair Information

If the VG7000 Series Bronze Control Valve fails to

operate within its specifications, refer to the VG7000

Series Bronze Control Valves Product Bulletin

(LIT-977140) fora list of repair parts andreconditioning

kits available. For a replacement valve, contact the

nearest Johnson Controls representative.

1 (DN25) N.O./PDTC 2-1/16 (53) 4-1/32 (102) 2-9/16 (65)

1-1/4 (DN32) N.O./PDTC 2-3/8 (60) 4-19/32 (117) 2-25/32 (70)

1-1/2 (DN40) N.O./PDTC 2-9/16 (65) 4-27/32 (123) 3-3/8 (85)

1. See Table 2 for overall assembly height Cand clearance Ddimensions.

Table 4: Two-Way N.O./PDTC Union Angle Valve Dimensions, in. (mm)1

Valve Size, in. (DN) E F G

Table 5: Two-Way N.O./PDTC, Two-Way N.C./PDTO, and Three-Way Mixing Union Sweat Valve

Dimensions, in. (mm)1

Valve Size, in. (DN) A B

Two-Way N.O./

PDTC Two-Way N.C./

PDTO Three-Way

Mixing

1/2 (DN15), 3/8 in. Tubing 4-3/16 (106) 13/16 (20) 1-17/32 (39) 2-17/32 (64)

1/2 (DN15), 1/2 in. Tubing 4-3/16 (106) 13/16 (20) 1-17/32 (39) 2-17/32 (64)

1/2 (DN15), 3/4 in. Tubing 4-25/32 (122) 13/16 (20) 1-17/32 (39) 2-17/32 (64)

3/4 (DN20) 5-1/16 (129) 15/16 (24) 1-9/16 (40) 3-1/4 (82)

1 (DN25) 6-3/32 (155) 1-5/32 (29) 1-3/4 (44) 3-23/32 (94)

1-1/4 (DN32) 7-9/32 (185) 1-11/32 (34) 2 (51) 4-3/32 (104)

1-1/2 (DN40) 8-19/32 (218) 2-5/32 (55) 2-3/4 (70) 4-29/32 (125)

2 (DN50) 9-7/16 (240) 2-1/8 (53) 2-27/32 (72) 5-19/32 (142)

1. See Table 2 for overall assembly height Cand clearance Ddimensions.

Figure 5: Two-Way N.O./PDTC, Two-Way N.C./PDTO, and Three-Way Mixing Union Sweat Valve

Dimensions (See Table 5.)

Fig:unionsweat

VG7000 Series Bronze Control Valves Installation Instructions

Pre-servicing Details

Before servicing a VG7000 Series Bronze Control

Valve, isolate or disconnect the pneumatic supply or

electricalpowertotheactuatorand note the following:

Valve Removal Details

In addition to observing general mounting guidelines

and National Code Standards, be sure to note the

following before removing a valve from a piping

system:

• Allow hot water or steam systems to cool down

thoroughly before proceeding.

• Drain the piping system to provide a pressure-free

work environment.

• Vent all piping systems that are used in conjunction

with corrosive or aggressive fluids.

• Be sure all work is performed by qualified

personnel only.

Risk of Electric Shock.

Disconnect or isolate all power supplies before

making electrical connections. More than one

disconnection or isolation may be required to

completely de-energize equipment. Contact with

components carrying hazardous voltage can cause

electric shock and may result in severe personal injury

or death.

Risque de décharge électrique.

Débrancher ou isoler toute alimentation avant de

réaliser un branchement électrique. Plusieurs

isolations et débranchements sont peut-être

nécessaires pour -couper entièrement l'alimentation

de l'équipement. Tout contact avec des composants

conducteurs de tensions dangereuses risque

d'entraîner une décharge électrique et de provoquer

des blessures graves, voire mortelles.

Risk of Personal Injury.

Shut off the liquid supply and relieve pressure in the

line before servicing the valve. Contents of liquid lines

could be under pressure and the release of liquid

under pressure may cause severe personal injury.

Risque de blessure.

Couper l'alimentation en liquide et évacuer la

pression présente dans la conduite avant toute

intervention sur la vanne. Les liquides à l'intérieur des

conduites peuvent être sous pression et la libération

soudaine de liquide sous pression risque de

provoquer des blessures graves.

Risk of Property Damage.

Do not apply power to the system before checking all

wiring connections. Short circuited or improperly

connected wires may result in permanent damage to

the equipment.

Risque de dégâts matériels.

Ne pas mettre le système sous tension avant d'avoir

vérifié tous les raccords de câblage. Des fils formant

un court-circuit ou connectés de façon incorrecte

risquent d'endommager irrémédiablement

l'équipement.

IMPORTANT: Make all wiring connections in

accordance with local, national, and regional

regulations. Do not exceed the electrical ratings of

the VG7000 Series Bronze Control Valve.

This product can expose you to chemicals

including lead, which is known to the State

of California to cause cancer, birth defects,

or other reproductive harm. For more infor-

mation, go to www.P65Warnings.ca.gov.

This product is made of copper alloy, which

contains lead. The product is therefore not

to be used on drinking water.

VG7000 Series Bronze Control Valves Installation Instructions

Technical Specifications

VG7000 Series Bronze Control Valves (Part 1 of 2 )

Service1Hot Water, Chilled Water, 50/50 Glycol Solutions, or Steam for HVAC

Systems (Fluid Group 1 According to 67/548/EEC)

Valve Body Size/Cv (kv) 1/2 in. 0.73 (0.63), 1.8 (1.6), and 4.6 (4.0)

3/4 in. 7.3 (6.3)

1 in. 11.6 (10)

1-1/4 in. 18.5 (16)

1-1/2 in. 28.9 (25)

2 in. 46.2 (40)

Valve Stroke 5/16 in. (8 mm) for 1/2 or 3/4 in. Valves

1/2 in. (13 mm) for 1 and 1-1/4 in. Valves

3/4 in. (19 mm) for 1-1/2 and 2 in. Valves

Valve Body Rating Meets Requirements of ANSI B16.15, Class 250 (EN 12360).

Valve Ambient Operating

Temperature Limits 35 to 150°F (2 to 65°C)

Valve Assembly Maximum

Allowable Pressure/Temperature Steam Brass Trim: 35 psig (241 kPa) Saturated Steam at 281°F (138°C)

SS Trim: 100 psig (690 kPa) Saturated Steam at 338°F (170°C)

Water Brass Trim: 400 psig (2,756 kPa) up to 150°F (66°C), Decreasing to 365

psig (2,515 kPa) at 248°F (120°C)

SS Trim: 400 psig (2,756 kPa) up to 150°F (66°C), Decreasing to 308 psig

(2,122 kPa) at 338°F (170°C)

Leakage Brass Trim 0.01% of Maximum Flow per ANSI/FCI 70-2, Class 4

SS Trim 0.05% of Maximum Flow

Inherent Flow Characteristics Two-Way

Valves Equal Percentage

Three-Way

Mixing Valves Linear

Rangeability2> 25:1 for the 1/2 in. size, Cv 0.73, valve bodies

> 100:1 for all other VG7000 series valves

Spring Range Pneumatic

Actuators 3 to 6 psig (21 to 41 kPa) for All Except MP8000;

3 to 7 psig (21 to 48 kPa) for MP8000 Only;

4 to 8 psig (28 to 55 kPa);

9 to 13 psig (62 to 90 kPa)

Maximum Recommended

Operating Pressure Drop Steam Brass Trim: 15 psig (103 kPa) for All Valve Sizes

SS Trim: 100 psig (690 kPa) for All Valve Sizes

Water Brass and SS Trim: 35 psig (241 kPa) for 1/2 through 1-1/4 in. Valves; 30

psig (207 kPa) for 1-1/2 and 2 in. Valves

Maximum Actuator Supply

Pressure (Pneumatically

Actuated Valves Only)

25 psig (172 kPa) Maximum

Materials Body: Cast Bronze

Bonnet: Brass

Brass Trim Stem: Stainless Steel

Plug: Brass

Seat: Brass Against Molded Elastomeric Disk

Packing: Self-Adjusting Ethylene Propylene Rubber (EPR) Ring Pack

U-Cups

SS Trim Stem: Stainless Steel

Plug: Stainless Steel

Seat: Stainless Steel

Packing: Spring Loaded Polytetrafluoroethylene (PTFE) and Elastomer

V-Rings

Published in U.S.A. www.johnsoncontrols.com

VG7000 Series Bronze Control Valves Installation Instructions

Metasys® and Johnson Controls® are registered trademarks of Johnson Controls

Building Technologies & Solutions

507 E. Michigan Street, Milwaukee, WI 53202

Valve Fluid Operating

Temperature Limits Brass Trim

Valve with

Pneumatic

Actuator

For V-3801-8001 and V-3000-8003 Actuators:

35 to 248°F (2 to 120°C) Water; 15 psig (103 kPa) Saturated Steam

For MP82 and V-3000-8012 Actuators:

35 to 284°F (2 to 140°C) Water; 38 psig (262 kPa) Saturated Steam

Brass Trim

Valve with

Electric

Actuator

For VA-8x2x Actuators:

195°F (91°C) Maximum Water; Actuators are not rated for steam.

For VA-4233-xGx-2 Actuators:

35 to 250°F (2 to 121°C) Water; 15 psig (103 kPa) Saturated Steam

For All Other Electric Actuators:

35 to 284°F (2 to 140°C) Water; 38 psig (262 kPa) Saturated Steam

SS Trim Valve

with

Pneumatic

Actuator

All Pneumatic Actuators:

35 to 338°F (2 to 170°C) Water; 100 psig (690 kPa) Saturated Steam

SS Trim Valve

with Electric

Actuator

For VA-4233-xGx-2 Actuators:

35 to 250°F (2 to 121°C) Water; 15 psig (103 kPa) Saturated Steam

For All Other Electric Actuators:

35 to 338°F (2 to 170°C) Water; 100 psig (690 kPa) Saturated Steam

Actuator Ambient Operating

Temperature Limits Refer to the appropriate actuator or linkage kit product bulletin.Ambient

operating temperature or other service limitations vary by selected actuator.

Compliance 1/2, 3/4, and

1 in. Valves Pressure Equipment Directive (PED) 97/23/EC: Paragraph 3, Comma 3

(CE Marking not Applicable.)

1-1/4, 1-1/2,

and 2 in.

Valves

Pressure Equipment Directive (PED) 97/23/EC:

Category 1, Mod. A (Subject to CE Marking)

All Valve

Sizes CRN: C1099.9087YTN

1. Proper water treatment is recommended; refer to VDI 2035 Guideline.

2. Rangeability is defined as the ratio of maximum flow to minimum controllable flow.

European Single Point of Contact: NA/SA Single Point of Contact: APAC Single Point of Contact:

JOHNSON CONTROLS

WESTENDHOF 3

45143 ESSEN

GERMANY

JOHNSON CONTROLS

507 E MICHIGAN ST

MILWAUKEE WI 53202

USA

JOHNSON CONTROLS

C/O CONTROLS PRODUCT

MANAGEMENT

NO. 22 BLOCK D NEW DISTRICT

WUXI JIANGSU PROVINCE 214142

CHINA

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these

specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or

misuse of its products.

VG7000 Series Bronze Control Valves (Part 2 of 2 )

WARNING: BRASS MAY CONTAIN LEAD

To fulfill our obligations towards Article 33, in accordance to the European REACH Regulation No 1907/2006 EC, we hereby inform you that this article contains

the following Substances of Very High Concern mentioned on the Candidate list:

• Lead

Table des matières

Autres manuels Johnson Controls Unité de contrôle

Johnson Controls

Johnson Controls V46SA Series Manuel utilisateur

Johnson Controls

Johnson Controls TYCO DPV-1 Manuel d'instructions

Johnson Controls

Johnson Controls GS Series Manuel utilisateur

Johnson Controls

Johnson Controls S300 Series Instructions de montage

Johnson Controls

Johnson Controls Mercury P2000 CKM-MR16IN Manuel

Johnson Controls

Johnson Controls IOM1711 Manuel utilisateur

Johnson Controls

Johnson Controls V43 Series Manuel

Johnson Controls

Johnson Controls TrueRH Series Mode d’emploi

Johnson Controls

Johnson Controls IOM3723 Manuel utilisateur

Johnson Controls

Johnson Controls Tyco DV-5a Series Manuel utilisateur

Johnson Controls

Johnson Controls EM-3000 Series Manuel utilisateur

Johnson Controls

Johnson Controls VMA 1410 Guide d'installation

Johnson Controls

Johnson Controls M300CJ Manuel utilisateur

Johnson Controls

Johnson Controls MS-IOU4710-0U Manuel utilisateur

Johnson Controls

Johnson Controls VP140 Manuel utilisateur

Johnson Controls

Johnson Controls Penn P28 Series Manuel utilisateur

Johnson Controls

Johnson Controls Tyco DV-5a Series Manuel utilisateur

Johnson Controls

Johnson Controls VG8000V Series Manuel utilisateur

Johnson Controls

Johnson Controls G77 Series Manuel de service

Johnson Controls

Johnson Controls GS-20 Series Manuel utilisateur

Johnson Controls

Johnson Controls S300 Series Instructions de montage

Johnson Controls

Johnson Controls M4-XPM Manuel utilisateur

Johnson Controls

Johnson Controls CKM-F8P Manuel

Johnson Controls

Johnson Controls CKM-MR51E Instructions de montage

Manuels Unité de contrôle populaires d'autres marques

Festo

Festo Compact Performance CP-FB6-E Manuel de la liste des pièces

Elo TouchSystems

Elo TouchSystems DMS-SA19P-EXTME Manuel utilisateur

JS Automation

JS Automation MPC3034A Manuel utilisateur

JAUDT

JAUDT SW GII 6406 Series Guide rapide

Spektrum

Spektrum Air Module System Manuel utilisateur

BOC Edwards

BOC Edwards Q Series Manuel utilisateur

KHADAS

KHADAS BT Magic Manuel utilisateur

Etherma

Etherma eNEXHO-IL Manuel utilisateur

PMFoundations

PMFoundations Attenuverter Manuel utilisateur

GEA

GEA VARIVENT Manuel utilisateur

Walther Systemtechnik

Walther Systemtechnik VMS-05 Manuel utilisateur

Altronix

Altronix LINQ8PD Instructions de montage

Eaton

Eaton Powerware Series Manuel utilisateur

WAGO

WAGO 750-407/040-000 Manuel utilisateur

Sony

Sony CCU-590 Manuel utilisateur

Graco

Graco 25D614 Manuel utilisateur

Task Force Tips

Task Force Tips YE-RF-900 Manuel de programmation

Shini

Shini SPV-U Series Manuel utilisateur